{ "data": { "a": { "slug": "mailjet", "name": "Mailjet API + MCP", "vendor": "Mailjet (Sinch)", "vendorUrl": "https://www.mailjet.com", "kind": "http-api", "category": "email", "summary": "Sinch-owned email API with Send API v3.1, SMTP relay, a Parse API for inbound mail, templates and a marketing editor.", "url": "https://www.anchorterminal.com/tools/mailjet", "markdownUrl": "https://www.anchorterminal.com/tools/mailjet.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mailjet.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mailjet.json", "dns": "mailjet.grade.anchorterminal.com", "repo": "https://github.com/mailjet/mailjet-apiv3-nodejs", "license": "MIT", "transports": [ "http", "stdio" ], "remoteUrl": "https://api.mailjet.com/v3.1", "packages": [ { "registry": "npm", "name": "node-mailjet" }, { "registry": "npm", "name": "@mailjet/mailjet-mcp-server" }, { "registry": "pypi", "name": "mailjet-rest" } ], "auth": "api-key", "authNotes": "HTTP Basic auth with the public API key as user and the secret key as password. The MCP server takes both as MAILJET_API_KEY in `key:secret` form, and MAILJET_API_REGION=eu switches to EU servers.", "pricing": "freemium", "pricingNotes": "Free 6,000 emails a month capped at 200 a day, no card. Starter $9 a month (8,000 emails), Essential $19 (15,000), Premium $29 (15,000), with prices rising by volume and 10 per cent off yearly. Emails over the plan are billed per extra 1,000 at a rate published in the help centre, which we couldn't read. Enterprise on quote (https://www.mailjet.com/pricing/).", "priceSummary": "$9 / mo", "where": "both", "x402": { "level": "no", "evidence": "No x402 or stablecoin payment path in docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": 117, "popularity": { "githubStars": 255, "npmWeekly": 177150, "pypiWeekly": 244633, "asOf": "2026-09-30" }, "docsUrl": "https://dev.mailjet.com", "llmsTxt": "https://dev.mailjet.com/llms.txt", "openapi": "https://dev.mailjet.com/_bundle/openapi/openapi-mailjet.yaml", "capabilities": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics", "email.marketing" ], "tags": [ "hosted", "freemium", "no-card", "mcp", "llms-txt", "openapi", "typescript", "python", "webhooks" ], "lastRelease": "2026-10-26", "graded": true, "anchor": { "graded": true, "score": 59.6, "grade": "C", "agentReady": false, "rank": 694, "ranked": true, "rankOf": 1510, "categoryRank": 16, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 53, "maintenance": 79, "payments": 30, "reliability": 62, "schema": 76, "security": 52, "transparency": 74 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-04" }, "negative": 0, "verdict": "SandboxMode on Send API v3.1 validates a payload without delivering it, and data is stored in the EU. The released MCP server registers 117 GET-only tools and can't send. Rate limits are published without numbers, and the 429 guidance is to wait and retry, with no Retry-After header or idempotency key.", "bestFor": "EU-based senders who want cheap transactional and marketing mail with data kept in the EU.", "strengths": [ "SandboxMode on Send API v3.1 validates a payload without delivering it", "Data stored on Google Cloud in Frankfurt and Saint-Ghislain", "Parse API routes inbound mail to a webhook", "OpenAPI files, llms.txt and Markdown pages", "Free plan of 6,000 emails a month with no card" ], "weaknesses": [ "The MCP server registers 117 GET-only tools and can't send", "No numeric rate limits published", "Price per extra 1,000 emails isn't on the pricing page", "No bug bounty, disclosure policy or security.txt found", "The MCP repository says 1.2.0 while its git tags stop at a beta, and the npm version couldn't be read" ], "agentNotes": [ "Set `SandboxMode` to true on the first sends to check payloads without delivering", "Send with POST /v3.1/send and a `Messages` array, many messages per call", "Use the MCP for statistics and contact lookups only, since it can't send", "Pass `MAILJET_API_KEY` as `key:secret`. The server checks it at startup and exits if it's wrong", "On 429, wait and retry. Non-transactional endpoints have much lower limits than send", "Move legacy calls off `/v3/REST/newsletter` and the old statistics resources to `campaigndraft` and `statcounters`. They are deprecated and may be removed" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 59.6 } ], "editorialScores": { "ergonomics": 53, "maintenance": 79, "payments": 30, "reliability": 62, "schema": 76, "security": 52, "transparency": 58 }, "provenanceScore": 90, "checked": { "categories": { "ergonomics": "2026-11-04", "maintenance": "2026-11-04", "payments": "2026-11-04", "reliability": "2026-11-04", "schema": "2026-11-04", "security": "2026-11-04", "transparency": "2026-11-04" }, "last": "2026-11-04", "lastMoved": "2026-11-04", "oldest": "2026-11-04", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl -X POST https://api.mailjet.com/v3.1/send --user \"$MJ_APIKEY_PUBLIC:$MJ_APIKEY_PRIVATE\" \\\n -H \"Content-Type: application/json\" -d '{\"Messages\":[{\"From\":{\"Email\":\"you@example.com\"},\"To\":[{\"Email\":\"them@example.com\"}],\"Subject\":\"Hello\",\"TextPart\":\"Hello from Mailjet\"}]}'", "claudeCode": "claude mcp add mailjet -e MAILJET_API_KEY=\"$MJ_APIKEY_PUBLIC:$MJ_APIKEY_PRIVATE\" -- npx -y @mailjet/mailjet-mcp-server", "config": { "mcpServers": { "mailjet": { "args": [ "-y", "@mailjet/mailjet-mcp-server" ], "command": "npx", "env": { "MAILJET_API_KEY": "${MJ_APIKEY_PUBLIC}:${MJ_APIKEY_PRIVATE}" } } } } }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/mailjet" }, "area": "communication", "unitPrices": [ { "item": "Starter", "unit": "month", "usd": 9, "note": "8,000 emails a month" }, { "item": "Essential", "unit": "month", "usd": 19, "note": "15,000 emails a month" }, { "item": "Premium", "unit": "month", "usd": 29, "note": "15,000 emails a month, automations and dedicated IP from 100k" } ], "provenance": { "legalEntity": "Mailjet SAS", "domain": "mailjet.com", "domainRegistered": "2006-11-08", "endpointOnVendorDomain": true, "terms": "https://www.mailjet.com/legal/terms/", "privacy": "https://www.mailjet.com/legal/privacy-policy/", "statusPage": "https://mailjet.statuspage.io/", "changelog": "https://www.mailjet.com/releases/", "securityTxt": "none", "checked": "2026-11-04", "notes": [ "Mailjet is a Sinch brand. The terms list Mailjet SAS, Mailjet GmbH and Mailgun Technologies, Inc. as contracting entities depending on the customer.", "https://www.mailjet.com/.well-known/security.txt answered 404 on 4 November 2026. Sinch's trust portal names security@sinch.com for vulnerability reports." ], "score": 90 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/mailjet.json", "live": { "slug": "mailjet", "probe": { "target": "https://api.mailjet.com/v3.1", "method": "get", "lastAt": "2026-11-07T19:22:17.930231428Z", "lastOk": true, "lastStatus": 404, "lastMs": 122, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 50, "p95ms24h": 182, "samples24h": 238, "samples30d": 7920, "days": [ { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 251, "ok": 251 }, { "date": "2026-10-29", "probes": 248, "ok": 248 }, { "date": "2026-10-30", "probes": 249, "ok": 249 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 185 }, { "date": "2026-11-06", "probes": 241, "ok": 241 }, { "date": "2026-11-07", "probes": 197, "ok": 197 } ] }, "vendorStatus": { "page": "https://mailjet.statuspage.io", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-11-07T19:22:26.945988993Z" }, "versions": [ { "registry": "github", "name": "mailjet/mailjet-apiv3-nodejs", "version": "v7.1.1", "released": "2026-10-26", "seenAt": "2026-11-06T23:42:00.512078863Z" }, { "registry": "npm", "name": "@mailjet/mailjet-mcp-server", "version": "1.2.0", "seenAt": "2026-11-06T23:42:00.047567295Z" }, { "registry": "npm", "name": "node-mailjet", "version": "6.0.11", "seenAt": "2026-11-06T23:41:57.7254338Z" }, { "registry": "pypi", "name": "mailjet-rest", "version": "1.9.1", "released": "2026-10-07", "seenAt": "2026-11-06T23:42:00.242753535Z" } ], "githubStars": 256, "npmWeekly": 266535, "pypiWeekly": 215229, "securityTxt": { "url": "https://mailjet.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T15:59:38.508331149Z" }, "llmsTxt": { "url": "https://dev.mailjet.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:56.319729835Z" }, "domain": { "domain": "mailjet.com", "registered": "2006-11-08", "source": "https://rdap.verisign.com/com/v1/domain/mailjet.com", "checkedAt": "2026-11-01T14:22:55.139773955Z" }, "pages": [ { "url": "https://www.mailjet.com/releases/", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:31:15.748096341Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "67d03918114f" }, { "url": "https://www.mailjet.com/pricing/", "kind": "pricing", "status": 304, "checkedAt": "2026-11-07T14:31:13.736066734Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "ca0a13159f03" }, { "url": "https://www.mailjet.com/legal/privacy-policy/", "kind": "privacy", "status": 304, "checkedAt": "2026-11-07T14:31:09.707964777Z", "changedAt": "2026-10-21T01:04:08.921640233Z", "fingerprint": "55d1db81050b" }, { "url": "https://www.mailjet.com/legal/terms/", "kind": "terms", "status": 304, "checkedAt": "2026-11-07T14:31:11.769933759Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "bd8f1e18634f" } ], "github": { "repo": "mailjet/mailjet-apiv3-nodejs", "checkedAt": "2026-11-02T09:02:39.097960807Z", "stars": 256, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-26T08:02:14Z", "openIssues": 1, "openPRs": 19, "issuesOpened90d": 1, "issuesClosed90d": 4, "prsMerged90d": 24, "replies": { "sampled": 25, "unanswered": 1, "medianDays": 372.5 } }, "updatedAt": "2026-11-07T19:22:17.930231428Z" } }, "answer": "Mailjet API + MCP scores 59.6 (C) on agent readiness against MailPace's 58.4 (C), and leads in 4 of 7 scored categories. MailPace leads on reliability and agent ergonomics.", "b": { "slug": "mailpace", "name": "MailPace", "vendor": "OhMySMTP Ltd", "vendorUrl": "https://mailpace.com", "kind": "http-api", "category": "email", "summary": "MailPace is a UK transactional email service, formerly OhMySMTP, hosted in the EU. It sends mail through an HTTPS API or SMTP, turns inbound mail into webhooks and has a Domains and Email Status API.", "url": "https://www.anchorterminal.com/tools/mailpace", "markdownUrl": "https://www.anchorterminal.com/tools/mailpace.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mailpace.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mailpace.json", "dns": "mailpace.grade.anchorterminal.com", "repo": "https://github.com/mailpace/mailpace-mcp", "transports": [ "http" ], "packages": [ { "registry": "npm", "name": "@mailpace/mailpace.js" } ], "auth": "api-key", "authNotes": "Each domain has its own server token, sent in the `MailPace-Server-Token` header, which can send from that domain and read its email status. An organisation token in `MailPace-Organization-Token` manages domains and domain tokens through the Domains API, including revoking them. Both are made in the dashboard after a browser signup.", "pricing": "paid", "pricingNotes": "$10 a month includes 10,000 emails sent or received, then $1 per 1,000, per the Paddle prices the pricing page loads and the comparison pages ($100 for 100,000, $1,000 for 1 million). A free plan of up to 100 emails a month is given on request by email. Paddle is the merchant of record; card, PayPal, Apple Pay or Google Pay.", "priceSummary": "$10 / mo", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs repository, the pricing page or the MCP server source (checked 2026-11-06). Payment is by Paddle subscription; the FAQ says crypto isn't accepted.", "endpoints": [] }, "toolCount": 12, "popularity": { "githubStars": 1, "npmWeekly": 207, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://docs.mailpace.com/", "capabilities": [ "email.send", "email.inbound", "email.domains", "email.analytics" ], "tags": [ "hosted", "closed-source", "smtp", "webhooks", "idempotency", "status-page", "sla", "eu", "mcp", "typescript", "ruby", "go", "php" ], "lastRelease": "2026-10-22", "graded": true, "anchor": { "graded": true, "score": 58.4, "grade": "C", "agentReady": false, "rank": 754, "ranked": true, "rankOf": 1510, "categoryRank": 17, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 71, "maintenance": 65, "payments": 25, "reliability": 70, "schema": 54, "security": 50, "transparency": 75 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "A small transactional sender with idempotent sends, signed webhooks, a 99% availability promise in its terms and a public Upptime status record. There is no OpenAPI spec, no published rate limit, no llms.txt, and its MCP server was rewritten on 4 November 2026 but isn't on npm or in the MCP registry yet.", "bestFor": "Low-volume transactional mail from EU-hosted infrastructure with idempotent sends and no tracking.", "strengths": [ "Sends accept an `Idempotency-Key` header kept for 24 hours, so a retry after a timeout doesn't send twice", "Per-domain server tokens limit a leaked key to one domain, and organisation tokens can create and revoke them by API", "Webhooks are signed with Ed25519 and inbound mail is retried five times before it fails", "Status page on Upptime with GitHub issues as incident reports, and a 99% monthly availability promise with credits in the terms", "Sub-processors and their locations are listed, and mail is kept 30 days plus 7 in backups per the DPA" ], "weaknesses": [ "No OpenAPI spec, llms.txt or Markdown docs for agents; the reference is Docusaurus pages", "Rate limits aren't published; the docs say they vary by organisation age, plan and history", "No free plan without emailing support, and the paid plan starts at $10 a month", "MCP server 2.0.0 exists only in the repository; npm and the MCP registry had nothing for it on 6 November 2026", "No security.txt, disclosure policy or certification found" ], "agentNotes": [ "Send a UUID in `Idempotency-Key` on every `POST /api/v1/send`, and reuse it on a retry; keys last 24 hours and are tied to one token", "Use the server token of the sending domain, since the From domain must match the token's domain or the API returns 403", "On 429 `You are sending emails too quickly` back off; no Retry-After is documented", "Send only transactional mail; marketing and bulk newsletters are prohibited by the docs and terms", "Read delivery with `GET /api/v1/domains/:domain_id/emails/:id` using the id the send returned" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 58.4 } ], "editorialScores": { "ergonomics": 71, "maintenance": 65, "payments": 25, "reliability": 70, "schema": 54, "security": 50, "transparency": 69 }, "provenanceScore": 81, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl https://app.mailpace.com/api/v1/send -X POST -H \"Accept: application/json\" -H \"Content-Type: application/json\" -H \"MailPace-Server-Token: $MAILPACE_TOKEN\" -H \"Idempotency-Key: $(uuidgen)\" -d '{\"from\":\"you@yourdomain.com\",\"to\":\"person@example.com\",\"subject\":\"Hello\",\"textbody\":\"Hello\"}'" }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/mailpace" }, "area": "communication", "unitPrices": [ { "item": "Scaling plan", "unit": "month", "usd": 10, "note": "includes 10,000 emails sent or received" }, { "item": "Emails beyond 10,000", "unit": "1k-emails", "usd": 1 } ], "provenance": { "legalEntity": "OhMySMTP Ltd", "domain": "mailpace.com", "domainRegistered": "2022-01-10", "endpointOnVendorDomain": true, "terms": "https://mailpace.com/terms", "privacy": "https://mailpace.com/privacy", "statusPage": "https://status.mailpace.com", "changelog": "https://mailpace.com/category/changelog", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The terms and privacy policy name OhMySMTP Ltd, incorporated in England and Wales, company number 13200428. Companies House lists two active directors.", "Terms last updated 9 January 2026, privacy policy 30 August 2026, DPA updated in October 2026 per the landing repository.", "mailpace.com/robots.txt allows all paths. The terms contain no clause on automated access to the website beyond the usual licence limits.", "RDAP gives mailpace.com a registration date of 10 January 2022; the service ran as OhMySMTP before that.", "/.well-known/security.txt returns 404 on mailpace.com and app.mailpace.com." ], "score": 81 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/mailpace.json", "live": { "slug": "mailpace", "vendorStatus": { "page": "https://status.mailpace.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-07T04:48:01.553362214Z" }, "versions": [ { "registry": "npm", "name": "@mailpace/mailpace.js", "version": "0.1.3", "seenAt": "2026-11-06T23:42:02.752996422Z" } ], "githubStars": 1, "npmWeekly": 207, "securityTxt": { "url": "https://mailpace.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:07.630537329Z" }, "pages": [ { "url": "https://mailpace.com/category/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-11-07T14:13:40.841899008Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "38f92a159d1b" }, { "url": "https://mailpace.com/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-11-07T14:13:45.28058492Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e6b0fea49c1d" }, { "url": "https://mailpace.com/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:13:45.480605157Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "24f1eed01dad" } ], "updatedAt": "2026-11-07T16:01:07.630537329Z" } }, "edges": [ { "by": 22, "category": "schema", "leads": "mailjet", "name": "Schema \u0026 documentation", "reasons": { "a": "Published OpenAPI files, and the MCP server bundles a 528 KB copy (25). llms.txt with about 120 links and Markdown pages (10). MCP tool descriptions are the operation summary only, and the reference describes each resource without saying when not to use it (8). Typed from OpenAPI, with Limit, Offset, Sort and countOnly parameters across GET resources (11). Status-code and error-code pages, and examples per endpoint (12). Send API v3 and v3.1 are versioned, and the releases page has dated entries, but they're product launches rather than an API changelog (10). Re-read on 4 November, llms.txt lists the API reference, guides and a Deprecated Endpoints page; release entries on the releases page stop at 3 September.", "b": "No OpenAPI or other machine-readable contract for the HTTPS API. The MCP server's 12 tools have typed zod inputs and output schemas, but that server isn't published yet, so partial credit (8 of 25). llms.txt answers 404 on mailpace.com and docs.mailpace.com, and no Markdown copies are served (0). The reference states what each endpoint does, and the introduction says when not to use it (transactional only, no batch, no static IPs) (12 of 20). Field tables give type, examples and required or optional, with enums for status, sort and direction and the 50-recipient cap in text (9 of 15). Examples in curl and six languages and a full table of error responses with messages, though several listed messages have a broken quote (`{\"error:\"...`) and the send reference says 30 MB where the home page says 25 MB (12 of 15). Version in the path with a promise that an old version runs until a published end-of-life date, and dated changelog posts (13 of 15). Total 54." }, "scores": { "a": 76, "b": 54 } }, { "by": 18, "category": "ergonomics", "leads": "mailpace", "name": "Agent ergonomics", "reasons": { "a": "The released MCP server registers one tool for each of the 117 GET paths in its bundled spec, with no toolsets (5). Limit, Offset, Sort and countOnly on list resources, with a maximum of 1,000 results a page (15). Documented status codes and error codes with messages (14). Every MCP tool is a GET, so nothing it does can change the account. The repository's 1.2.0 (29 October 2026, no tag) adds `readOnlyHint` and `destructiveHint` annotations, but npm couldn't be read, so its release is unconfirmed and not credited. The Send API has no idempotency key (6). Official SDKs for Node, Python and other languages, one POST /v3.1/send call carries a Messages array, and the MCP needs the key and secret joined as `key:secret` (13). 5 + 15 + 14 + 6 + 13 = 53.", "b": "Responses are small, the send returns an id and status and Email Status returns one email (18 of 25). Only the domains list takes `limit`, `offset`, `sort` and `direction`; there is no endpoint to list or search sent mail (8 of 20). Errors are JSON with a human message and an HTTP status for each case in the documented table, with no stable error codes (14 of 20). `Idempotency-Key` on sends, kept 24 hours per token, and failed validations are not stored so they can be retried. The MCP server marks send as not idempotent and revoke as destructive (18 of 20). A send needs from, to, a subject and a body; official libraries for Node, Rails, Go and PHP transports and an SMTP route (13 of 15). Total 71." }, "scores": { "a": 53, "b": 71 } }, { "by": 14, "category": "maintenance", "leads": "mailjet", "name": "Maintenance \u0026 community", "reasons": { "a": "node-mailjet v7.1.1 on 26 October 2026, a code fix enforcing HTTPS-only requests, 9 days before the check (30). In the 90 days from 6 August, the releases page's 3 September entry and five SDK tags at half each (node-mailjet v7.1.0 on 14 August and v7.1.1, mailjet-apiv3-python 1.8.0 on 17 August, 1.9.0 on 14 September and 1.9.1 on 8 October), 3.5 in all (20). The MCP repository merges pull requests, and its README asks users to file an issue if npm and GitHub diverge. We couldn't see issue reply times (8). Node and Python SDKs released in the last 10 and 27 days (15). CI runs the tests, but the MCP repository's package.json says 1.2.0 while its git tags stop at v1.1.0-beta.1, and npm couldn't be read (6). 30 + 20 + 8 + 15 + 6 = 79.", "b": "Email Status API documented on 22 October 2026, and the MCP server rewritten as 2.0.0 on 4 November 2026, two days before this check (30). In the 90 days from 8 August, the Q3 changelog post of 31 August, the Email Status docs of 22 October, a mailpace-rails push on 17 October and the MCP rewrite, but only one changelog post (15 of 20). A closed service with email support. Three pull requests to the MCP repository from 2025 have no reply (8 of 15). Not in the official MCP registry (search for mailpace returned nothing on 6 November). The Node library was last pushed in October 2024 and Go in January 2024, while mailpace-rails is current (7 of 15). The MCP server gained CI with tests on 4 November; the older SDKs weren't checked for CI (5 of 10). Total 65." }, "scores": { "a": 79, "b": 65 } }, { "by": 8, "category": "reliability", "leads": "mailpace", "name": "Reliability", "reasons": { "a": "Statuspage at mailjet.statuspage.io with history back to 2023, read through its history.atom feed (20). In the 90 days from 6 August the feed has two entries. A planned hour of infrastructure maintenance on 23 September, during which logins and API and SMTP sends were unavailable and submitted mail waited in the queue, and a Microsoft incident on 4 September that deferred mail to M365 only, with other providers unaffected. Both read as minor (20). The rate-limit page, unchanged on 4 November, says transactional endpoints have a high limit and others a 'much lower' one, with no numbers (0). A 429 on excess and advice to wait and retry, but no Retry-After header and no idempotency key for sends. SandboxMode validates a send without delivering (7). Enterprise plans list a 'Service Level Agreement' with no published terms, per the 1 October check, not re-read on 4 November (5). GA (10). 20 + 20 + 0 + 7 + 5 + 10 = 62.", "b": "Graded with the hosted lines. A public Upptime status page at status.mailpace.com, driven by the mailpace/status repository, with monitors for the application, SMTP, docs, blog and landing page and GitHub issues as incident reports (20). The 90 days from 8 August hold two incidents, an application outage on 22 September 2026 that the operator put down to an upstream provider returning 5xx (issue open for two minutes), and SMTP down on 2 November 2026 for about 35 minutes, which leaves SMTP at 99.65% for the week. Minor incidents only (20). No rate limit numbers are published; the docs say limits vary by organisation age, plan and history (0). A documented 429 with its message, no Retry-After or backoff guidance, and an `Idempotency-Key` on sends with written retry rules (10 of 15). The terms guarantee 99% monthly availability of the API and dashboard with a 5% credit per 30 minutes (10). The API is at v1 with no beta label (10). Total 70." }, "scores": { "a": 62, "b": 70 } }, { "by": 5, "category": "payments", "leads": "mailjet", "name": "Payments \u0026 pricing", "reasons": { "a": "No x402, MPP or L402 (0). Plan prices are public, but the price per extra 1,000 emails sits behind a help-centre link rather than on the pricing page (10). Free plan of 6,000 emails a month, 200 a day, with no card (20). Browser signup, no autonomous route (0).", "b": "No x402, MPP or L402 (0). $10 a month for 10,000 emails and $1 per 1,000 after, loaded from Paddle on the pricing page and stated in the comparison pages' tables without login (20). A free plan of up to 100 emails a month is available only by emailing support, so it isn't self-serve (5 of 20). Signup, DKIM verification and payment happen in a browser (0). Total 25." }, "scores": { "a": 30, "b": 25 } } ], "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Mailjet (Sinch)", "b": "OhMySMTP Ltd", "name": "Vendor" }, { "a": "https://api.mailjet.com/v3.1", "b": "no (local only)", "name": "Hosted endpoint" }, { "a": "HTTP, stdio", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Paid", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT", "b": "none", "name": "Licence" }, { "a": "117", "b": "12", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "no", "name": "llms.txt" }, { "a": "2026-10-26", "b": "2026-10-22", "name": "Last release" }, { "a": "no date given", "b": "2026-01-09", "name": "Terms last updated" }, { "a": "2026-09-29", "b": "2026-08-30", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "255 stars, 177k npm/wk, 245k PyPI/wk", "b": "1 stars, 207 npm/wk", "name": "Popularity" }, { "a": "2.5/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Mailjet API + MCP scores 59.6 (C) on agent readiness against MailPace's 58.4 (C), and leads in 4 of 7 scored categories. MailPace leads on reliability and agent ergonomics.", "question": "Which is better for AI agents, Mailjet API + MCP or MailPace?" }, { "answer": "Both need an API key.", "question": "Do Mailjet API + MCP and MailPace need an API key?" }, { "answer": "Mailjet API + MCP has a hosted endpoint at https://api.mailjet.com/v3.1. No hosted endpoint is listed for MailPace.", "question": "Can an agent call Mailjet API + MCP and MailPace without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Schema \u0026 documentation, 76 against 54", "Payments \u0026 pricing, 30 against 25", "Maintenance \u0026 community, 79 against 65" ], "also": [ "A hosted endpoint, with nothing to install", "Runs on your own machine", "Free to start without a card" ], "goodFor": "EU-based senders who want cheap transactional and marketing mail with data kept in the EU.", "slug": "mailjet", "watchFor": "The MCP server registers 117 GET-only tools and can't send" }, { "aheadOn": [ "Reliability, 70 against 62", "Agent ergonomics, 71 against 53" ], "also": null, "goodFor": "Low-volume transactional mail from EU-hosted infrastructure with idempotent sends and no tracking.", "slug": "mailpace", "watchFor": "No OpenAPI spec, llms.txt or Markdown docs for agents; the reference is Docusaurus pages" } ], "history": { "mailjet": [ { "causes": [ "evidence" ], "date": "2026-11-04", "delta": 0.1, "from": 59.5, "fromGrade": "C", "to": 59.6, "toGrade": "C" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.1, "from": 59.4, "fromGrade": "C", "to": 59.5, "toGrade": "C" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.1, "from": 59.5, "fromGrade": "C", "to": 59.4, "toGrade": "C" } ], "mailpace": null }, "job": { "capability": "email.send", "name": "Sending email" }, "others": [ { "json": "https://www.anchorterminal.com/compare/ahasend-vs-mailjet.json", "title": "AhaSend API + MCP vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/ahasend-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/ahasend-vs-mailpace.json", "title": "AhaSend API + MCP vs MailPace", "url": "https://www.anchorterminal.com/compare/ahasend-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailjet.json", "title": "Amazon SES vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailpace.json", "title": "Amazon SES vs MailPace", "url": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/brevo-vs-mailjet.json", "title": "Brevo API + MCP vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/brevo-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/brevo-vs-mailpace.json", "title": "Brevo API + MCP vs MailPace", "url": "https://www.anchorterminal.com/compare/brevo-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailjet.json", "title": "Cloudflare Email Service vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailpace.json", "title": "Cloudflare Email Service vs MailPace", "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailjet.json", "title": "Groundmail API + MCP vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailpace.json", "title": "Groundmail API + MCP vs MailPace", "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/loops-vs-mailjet.json", "title": "Loops API + MCP vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/loops-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/loops-vs-mailpace.json", "title": "Loops API + MCP vs MailPace", "url": "https://www.anchorterminal.com/compare/loops-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/mailersend-vs-mailjet.json", "title": "MailerSend vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/mailersend-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/mailersend-vs-mailpace.json", "title": "MailerSend vs MailPace", "url": "https://www.anchorterminal.com/compare/mailersend-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/mailgun-vs-mailjet.json", "title": "Mailgun API + MCP vs Mailjet API + MCP", "url": "https://www.anchorterminal.com/compare/mailgun-vs-mailjet" }, { "json": "https://www.anchorterminal.com/compare/mailgun-vs-mailpace.json", "title": "Mailgun API + MCP vs MailPace", "url": "https://www.anchorterminal.com/compare/mailgun-vs-mailpace" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-mailtrap.json", "title": "Mailjet API + MCP vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/mailjet-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-mandrill.json", "title": "Mailjet API + MCP vs Mailchimp Transactional (Mandrill)", "url": "https://www.anchorterminal.com/compare/mailjet-vs-mandrill" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-postmark.json", "title": "Mailjet API + MCP vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/mailjet-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-resend.json", "title": "Mailjet API + MCP vs Resend API + MCP", "url": "https://www.anchorterminal.com/compare/mailjet-vs-resend" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-sendgrid.json", "title": "Mailjet API + MCP vs Twilio SendGrid", "url": "https://www.anchorterminal.com/compare/mailjet-vs-sendgrid" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-sendlayer.json", "title": "Mailjet API + MCP vs SendLayer", "url": "https://www.anchorterminal.com/compare/mailjet-vs-sendlayer" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-smtp2go.json", "title": "Mailjet API + MCP vs SMTP2GO API + MCP", "url": "https://www.anchorterminal.com/compare/mailjet-vs-smtp2go" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-zoho-zeptomail.json", "title": "Mailjet API + MCP vs Zoho CPaaS (formerly ZeptoMail)", "url": "https://www.anchorterminal.com/compare/mailjet-vs-zoho-zeptomail" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-mailtrap.json", "title": "MailPace vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/mailpace-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-mandrill.json", "title": "MailPace vs Mailchimp Transactional (Mandrill)", "url": "https://www.anchorterminal.com/compare/mailpace-vs-mandrill" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-postmark.json", "title": "MailPace vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/mailpace-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-resend.json", "title": "MailPace vs Resend API + MCP", "url": "https://www.anchorterminal.com/compare/mailpace-vs-resend" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-sendgrid.json", "title": "MailPace vs Twilio SendGrid", "url": "https://www.anchorterminal.com/compare/mailpace-vs-sendgrid" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-sendlayer.json", "title": "MailPace vs SendLayer", "url": "https://www.anchorterminal.com/compare/mailpace-vs-sendlayer" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-smtp2go.json", "title": "MailPace vs SMTP2GO API + MCP", "url": "https://www.anchorterminal.com/compare/mailpace-vs-smtp2go" }, { "json": "https://www.anchorterminal.com/compare/mailpace-vs-zoho-zeptomail.json", "title": "MailPace vs Zoho CPaaS (formerly ZeptoMail)", "url": "https://www.anchorterminal.com/compare/mailpace-vs-zoho-zeptomail" } ], "panel": null, "scores": [ { "by": 8, "edge": "mailpace", "key": "reliability", "mailjet": 62, "mailpace": 70, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 22, "edge": "mailjet", "key": "schema", "mailjet": 76, "mailpace": 54, "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 18, "edge": "mailpace", "key": "ergonomics", "mailjet": 53, "mailpace": 71, "name": "Agent ergonomics", "weight": 13 }, { "by": 2, "edge": "mailjet", "key": "security", "mailjet": 52, "mailpace": 50, "name": "Security \u0026 auth", "weight": 14 }, { "by": 5, "edge": "mailjet", "key": "payments", "mailjet": 30, "mailpace": 25, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 14, "edge": "mailjet", "key": "maintenance", "mailjet": 79, "mailpace": 65, "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 1, "edge": "mailpace", "key": "transparency", "mailjet": 74, "mailpace": 75, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Mailjet API + MCP scores 59.6 (C) on agent readiness against MailPace's 58.4 (C), and leads in 4 of 7 scored categories. MailPace leads on reliability and agent ergonomics. Both do sending email.", "tasks": null, "tutorials": [], "verdicts": { "mailjet": "SandboxMode on Send API v3.1 validates a payload without delivering it, and data is stored in the EU. The released MCP server registers 117 GET-only tools and can't send. Rate limits are published without numbers, and the 429 guidance is to wait and retry, with no Retry-After header or idempotency key.", "mailpace": "A small transactional sender with idempotent sends, signed webhooks, a 99% availability promise in its terms and a public Upptime status record. There is no OpenAPI spec, no published rate limit, no llms.txt, and its MCP server was rewritten on 4 November 2026 but isn't on npm or in the MCP registry yet." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/mailjet-vs-mailpace", "json": "https://www.anchorterminal.com/compare/mailjet-vs-mailpace.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/mailjet-vs-mailpace.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/mailjet-vs-mailpace.min.md" }, "markdown": "Mailjet API + MCP scores 59.6 (C) on agent readiness against MailPace's 58.4 (C), and leads in 4 of 7 scored categories. MailPace leads on reliability and agent ergonomics. Both do sending email.\n\n- Mailjet API + MCP: grade C, 59.6/100, rank #694 of 1510. Markdown https://www.anchorterminal.com/tools/mailjet.md · JSON https://www.anchorterminal.com/api/v1/tools/mailjet.json\n- MailPace: grade C, 58.4/100, rank #754 of 1510. Markdown https://www.anchorterminal.com/tools/mailpace.md · JSON https://www.anchorterminal.com/api/v1/tools/mailpace.json\n- Best email delivery APIs for AI agents: https://www.anchorterminal.com/best/email/index.md\n- All 174 email comparisons: https://www.anchorterminal.com/compare/email/index.md\n\n## Which one, for what\n\n### Mailjet API + MCP (C)\n\nGood for: EU-based senders who want cheap transactional and marketing mail with data kept in the EU.\n\nAhead on:\n- Schema \u0026 documentation, 76 against 54\n- Payments \u0026 pricing, 30 against 25\n- Maintenance \u0026 community, 79 against 65\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n- Runs on your own machine\n- Free to start without a card\n\nWatch for: The MCP server registers 117 GET-only tools and can't send\n\n### MailPace (C)\n\nGood for: Low-volume transactional mail from EU-hosted infrastructure with idempotent sends and no tracking.\n\nAhead on:\n- Reliability, 70 against 62\n- Agent ergonomics, 71 against 53\n\nWatch for: No OpenAPI spec, llms.txt or Markdown docs for agents; the reference is Docusaurus pages\n\n\n## Why the edge\n\n### Schema \u0026 documentation: Mailjet API + MCP +22\n\n- Mailjet API + MCP (76): Published OpenAPI files, and the MCP server bundles a 528 KB copy (25). llms.txt with about 120 links and Markdown pages (10). MCP tool descriptions are the operation summary only, and the reference describes each resource without saying when not to use it (8). Typed from OpenAPI, with Limit, Offset, Sort and countOnly parameters across GET resources (11). Status-code and error-code pages, and examples per endpoint (12). Send API v3 and v3.1 are versioned, and the releases page has dated entries, but they're product launches rather than an API changelog (10). Re-read on 4 November, llms.txt lists the API reference, guides and a Deprecated Endpoints page; release entries on the releases page stop at 3 September.\n- MailPace (54): No OpenAPI or other machine-readable contract for the HTTPS API. The MCP server's 12 tools have typed zod inputs and output schemas, but that server isn't published yet, so partial credit (8 of 25). llms.txt answers 404 on mailpace.com and docs.mailpace.com, and no Markdown copies are served (0). The reference states what each endpoint does, and the introduction says when not to use it (transactional only, no batch, no static IPs) (12 of 20). Field tables give type, examples and required or optional, with enums for status, sort and direction and the 50-recipient cap in text (9 of 15). Examples in curl and six languages and a full table of error responses with messages, though several listed messages have a broken quote (`{\"error:\"...`) and the send reference says 30 MB where the home page says 25 MB (12 of 15). Version in the path with a promise that an old version runs until a published end-of-life date, and dated changelog posts (13 of 15). Total 54.\n\n### Agent ergonomics: MailPace +18\n\n- Mailjet API + MCP (53): The released MCP server registers one tool for each of the 117 GET paths in its bundled spec, with no toolsets (5). Limit, Offset, Sort and countOnly on list resources, with a maximum of 1,000 results a page (15). Documented status codes and error codes with messages (14). Every MCP tool is a GET, so nothing it does can change the account. The repository's 1.2.0 (29 October 2026, no tag) adds `readOnlyHint` and `destructiveHint` annotations, but npm couldn't be read, so its release is unconfirmed and not credited. The Send API has no idempotency key (6). Official SDKs for Node, Python and other languages, one POST /v3.1/send call carries a Messages array, and the MCP needs the key and secret joined as `key:secret` (13). 5 + 15 + 14 + 6 + 13 = 53.\n- MailPace (71): Responses are small, the send returns an id and status and Email Status returns one email (18 of 25). Only the domains list takes `limit`, `offset`, `sort` and `direction`; there is no endpoint to list or search sent mail (8 of 20). Errors are JSON with a human message and an HTTP status for each case in the documented table, with no stable error codes (14 of 20). `Idempotency-Key` on sends, kept 24 hours per token, and failed validations are not stored so they can be retried. The MCP server marks send as not idempotent and revoke as destructive (18 of 20). A send needs from, to, a subject and a body; official libraries for Node, Rails, Go and PHP transports and an SMTP route (13 of 15). Total 71.\n\n### Maintenance \u0026 community: Mailjet API + MCP +14\n\n- Mailjet API + MCP (79): node-mailjet v7.1.1 on 26 October 2026, a code fix enforcing HTTPS-only requests, 9 days before the check (30). In the 90 days from 6 August, the releases page's 3 September entry and five SDK tags at half each (node-mailjet v7.1.0 on 14 August and v7.1.1, mailjet-apiv3-python 1.8.0 on 17 August, 1.9.0 on 14 September and 1.9.1 on 8 October), 3.5 in all (20). The MCP repository merges pull requests, and its README asks users to file an issue if npm and GitHub diverge. We couldn't see issue reply times (8). Node and Python SDKs released in the last 10 and 27 days (15). CI runs the tests, but the MCP repository's package.json says 1.2.0 while its git tags stop at v1.1.0-beta.1, and npm couldn't be read (6). 30 + 20 + 8 + 15 + 6 = 79.\n- MailPace (65): Email Status API documented on 22 October 2026, and the MCP server rewritten as 2.0.0 on 4 November 2026, two days before this check (30). In the 90 days from 8 August, the Q3 changelog post of 31 August, the Email Status docs of 22 October, a mailpace-rails push on 17 October and the MCP rewrite, but only one changelog post (15 of 20). A closed service with email support. Three pull requests to the MCP repository from 2025 have no reply (8 of 15). Not in the official MCP registry (search for mailpace returned nothing on 6 November). The Node library was last pushed in October 2024 and Go in January 2024, while mailpace-rails is current (7 of 15). The MCP server gained CI with tests on 4 November; the older SDKs weren't checked for CI (5 of 10). Total 65.\n\n### Reliability: MailPace +8\n\n- Mailjet API + MCP (62): Statuspage at mailjet.statuspage.io with history back to 2023, read through its history.atom feed (20). In the 90 days from 6 August the feed has two entries. A planned hour of infrastructure maintenance on 23 September, during which logins and API and SMTP sends were unavailable and submitted mail waited in the queue, and a Microsoft incident on 4 September that deferred mail to M365 only, with other providers unaffected. Both read as minor (20). The rate-limit page, unchanged on 4 November, says transactional endpoints have a high limit and others a 'much lower' one, with no numbers (0). A 429 on excess and advice to wait and retry, but no Retry-After header and no idempotency key for sends. SandboxMode validates a send without delivering (7). Enterprise plans list a 'Service Level Agreement' with no published terms, per the 1 October check, not re-read on 4 November (5). GA (10). 20 + 20 + 0 + 7 + 5 + 10 = 62.\n- MailPace (70): Graded with the hosted lines. A public Upptime status page at status.mailpace.com, driven by the mailpace/status repository, with monitors for the application, SMTP, docs, blog and landing page and GitHub issues as incident reports (20). The 90 days from 8 August hold two incidents, an application outage on 22 September 2026 that the operator put down to an upstream provider returning 5xx (issue open for two minutes), and SMTP down on 2 November 2026 for about 35 minutes, which leaves SMTP at 99.65% for the week. Minor incidents only (20). No rate limit numbers are published; the docs say limits vary by organisation age, plan and history (0). A documented 429 with its message, no Retry-After or backoff guidance, and an `Idempotency-Key` on sends with written retry rules (10 of 15). The terms guarantee 99% monthly availability of the API and dashboard with a 5% credit per 30 minutes (10). The API is at v1 with no beta label (10). Total 70.\n\n### Payments \u0026 pricing: Mailjet API + MCP +5\n\n- Mailjet API + MCP (30): No x402, MPP or L402 (0). Plan prices are public, but the price per extra 1,000 emails sits behind a help-centre link rather than on the pricing page (10). Free plan of 6,000 emails a month, 200 a day, with no card (20). Browser signup, no autonomous route (0).\n- MailPace (25): No x402, MPP or L402 (0). $10 a month for 10,000 emails and $1 per 1,000 after, loaded from Paddle on the pricing page and stated in the comparison pages' tables without login (20). A free plan of up to 100 emails a month is available only by emailing support, so it isn't self-serve (5 of 20). Signup, DKIM verification and payment happen in a browser (0). Total 25.\n\n## Score by category\n\n| Category | Weight | Mailjet API + MCP | MailPace | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 62 | 70 | MailPace +8 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 76 | 54 | Mailjet API + MCP +22 |\n| Agent ergonomics | 13% (16.2 this run) | 53 | 71 | MailPace +18 |\n| Security \u0026 auth | 14% (17.5 this run) | 52 | 50 | Mailjet API + MCP +2 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 25 | Mailjet API + MCP +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 79 | 65 | Mailjet API + MCP +14 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 74 | 75 | MailPace +1 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **59.6 · C** | **58.4 · C** | |\n\n## Facts side by side\n\n| Fact | Mailjet API + MCP | MailPace |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Mailjet (Sinch) | OhMySMTP Ltd |\n| Hosted endpoint | `https://api.mailjet.com/v3.1` | no (local only) |\n| Transports | HTTP, stdio | HTTP |\n| Auth | API key | API key |\n| Pricing | Freemium | Paid |\n| x402 | no | no |\n| Licence | MIT | none |\n| Tools exposed | 117 | 12 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | no |\n| Last release | 2026-10-26 | 2026-10-22 |\n| Terms last updated | no date given | 2026-01-09 |\n| Privacy policy last updated | 2026-09-29 | 2026-08-30 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Popularity | 255 stars, 177k npm/wk, 245k PyPI/wk | 1 stars, 207 npm/wk |\n| Agent reviews | 2.5/5 (2) | none |\n\n## How the scores have moved\n\n### Mailjet API + MCP\n\n- +0.1 on 4 November 2026: new evidence\n- +0.1 on 27 October 2026: checklist\n- -0.1 on 8 October 2026: checklist\n\n### MailPace\n\nNo score change since it was listed.\n\n## Verdicts\n\n**Mailjet API + MCP.** SandboxMode on Send API v3.1 validates a payload without delivering it, and data is stored in the EU. The released MCP server registers 117 GET-only tools and can't send. Rate limits are published without numbers, and the 429 guidance is to wait and retry, with no Retry-After header or idempotency key.\n\n**MailPace.** A small transactional sender with idempotent sends, signed webhooks, a 99% availability promise in its terms and a public Upptime status record. There is no OpenAPI spec, no published rate limit, no llms.txt, and its MCP server was rewritten on 4 November 2026 but isn't on npm or in the MCP registry yet.\n\n## Before you call either\n\n### Mailjet API + MCP\n\n1. Set `SandboxMode` to true on the first sends to check payloads without delivering\n2. Send with POST /v3.1/send and a `Messages` array, many messages per call\n3. Use the MCP for statistics and contact lookups only, since it can't send\n4. Pass `MAILJET_API_KEY` as `key:secret`. The server checks it at startup and exits if it's wrong\n5. On 429, wait and retry. Non-transactional endpoints have much lower limits than send\n6. Move legacy calls off `/v3/REST/newsletter` and the old statistics resources to `campaigndraft` and `statcounters`. They are deprecated and may be removed\n\n### MailPace\n\n1. Send a UUID in `Idempotency-Key` on every `POST /api/v1/send`, and reuse it on a retry; keys last 24 hours and are tied to one token\n2. Use the server token of the sending domain, since the From domain must match the token's domain or the API returns 403\n3. On 429 `You are sending emails too quickly` back off; no Retry-After is documented\n4. Send only transactional mail; marketing and bulk newsletters are prohibited by the docs and terms\n5. Read delivery with `GET /api/v1/domains/:domain_id/emails/:id` using the id the send returned\n\n## Questions\n\n### Which is better for AI agents, Mailjet API + MCP or MailPace?\n\nMailjet API + MCP scores 59.6 (C) on agent readiness against MailPace's 58.4 (C), and leads in 4 of 7 scored categories. MailPace leads on reliability and agent ergonomics.\n\n### Do Mailjet API + MCP and MailPace need an API key?\n\nBoth need an API key.\n\n### Can an agent call Mailjet API + MCP and MailPace without installing anything?\n\nMailjet API + MCP has a hosted endpoint at https://api.mailjet.com/v3.1. No hosted endpoint is listed for MailPace.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/mailjet-vs-mailpace.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mailjet-vs-mailpace.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"mailjet\", \"b\": \"mailpace\"}`. From a terminal: `anchor compare mailjet mailpace`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mailjet.json and https://www.anchorterminal.com/api/v1/tools/mailpace.json\n\n## Other comparisons with Mailjet API + MCP or MailPace\n\n- [AhaSend API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/ahasend-vs-mailjet.md)\n- [AhaSend API + MCP vs MailPace](https://www.anchorterminal.com/compare/ahasend-vs-mailpace.md)\n- [Amazon SES vs Mailjet API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailjet.md)\n- [Amazon SES vs MailPace](https://www.anchorterminal.com/compare/amazon-ses-vs-mailpace.md)\n- [Brevo API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/brevo-vs-mailjet.md)\n- [Brevo API + MCP vs MailPace](https://www.anchorterminal.com/compare/brevo-vs-mailpace.md)\n- [Cloudflare Email Service vs Mailjet API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailjet.md)\n- [Cloudflare Email Service vs MailPace](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailpace.md)\n- [Groundmail API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailjet.md)\n- [Groundmail API + MCP vs MailPace](https://www.anchorterminal.com/compare/groundmail-vs-mailpace.md)\n- [Loops API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/loops-vs-mailjet.md)\n- [Loops API + MCP vs MailPace](https://www.anchorterminal.com/compare/loops-vs-mailpace.md)\n- [MailerSend vs Mailjet API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailjet.md)\n- [MailerSend vs MailPace](https://www.anchorterminal.com/compare/mailersend-vs-mailpace.md)\n- [Mailgun API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-mailjet.md)\n- [Mailgun API + MCP vs MailPace](https://www.anchorterminal.com/compare/mailgun-vs-mailpace.md)\n- [Mailjet API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-mailtrap.md)\n- [Mailjet API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailjet-vs-mandrill.md)\n- [Mailjet API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-postmark.md)\n- [Mailjet API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-resend.md)\n- [Mailjet API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailjet-vs-sendgrid.md)\n- [Mailjet API + MCP vs SendLayer](https://www.anchorterminal.com/compare/mailjet-vs-sendlayer.md)\n- [Mailjet API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-smtp2go.md)\n- [Mailjet API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mailjet-vs-zoho-zeptomail.md)\n- [MailPace vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailpace-vs-mailtrap.md)\n- [MailPace vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailpace-vs-mandrill.md)\n- [MailPace vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailpace-vs-postmark.md)\n- [MailPace vs Resend API + MCP](https://www.anchorterminal.com/compare/mailpace-vs-resend.md)\n- [MailPace vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailpace-vs-sendgrid.md)\n- [MailPace vs SendLayer](https://www.anchorterminal.com/compare/mailpace-vs-sendlayer.md)\n- [MailPace vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailpace-vs-smtp2go.md)\n- [MailPace vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mailpace-vs-zoho-zeptomail.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-07", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Mailjet API + MCP vs MailPace", "url": "" } ], "description": "Mailjet scores 59.6 (C) to MailPace's 58.4 (C) for sending email. 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