{
  "data": {
    "a": {
      "slug": "mailersend",
      "name": "MailerSend",
      "vendor": "MailerSend, Inc.",
      "vendorUrl": "https://www.mailersend.com",
      "kind": "http-api",
      "category": "email",
      "summary": "Transactional email service from MailerSend, Inc. with a REST API, SMTP relay, templates, inbound routing, webhooks and analytics, plus SMS and WhatsApp sending. Agents reach it with a scoped API token or through a hosted MCP server.",
      "url": "https://www.anchorterminal.com/tools/mailersend",
      "markdownUrl": "https://www.anchorterminal.com/tools/mailersend.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mailersend.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mailersend.json",
      "repo": "https://github.com/mailersend/mailersend-nodejs",
      "license": "Proprietary service under MailerSend's terms of use. The SDKs and the CLI on GitHub are MIT",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.mailersend.com/v1",
      "packages": [
        {
          "registry": "npm",
          "name": "mailersend"
        },
        {
          "registry": "pypi",
          "name": "mailersend"
        }
      ],
      "auth": "mixed",
      "authNotes": "The REST API takes a Bearer API token, created in the dashboard or through /v1/token, with any of 30 scopes and an optional sending domain. Tokens can be paused and deleted. SMTP relay uses separate SMTP users. The MCP server and the CLI use OAuth with a browser login, and the MCP authorisation server supports dynamic client registration and PKCE. Access is self-serve, but a new account passes an approval step before full sending.",
      "pricing": "freemium",
      "pricingNotes": "Free plan with 500 emails a month and 100 API requests a day, which the pricing FAQ says needs a card once the account is approved. A 14-day Professional trial starts at signup with the same limits. Hobby is $7 a month for 5,000 emails, Starter from $35 for 50,000 and Professional from $110 for 50,000, with overage of $0.50 to $1.50 per 1,000. Yearly billing takes 10 per cent off. Enterprise is priced by sales (https://www.mailersend.com/pricing, checked 2026-10-08).",
      "priceSummary": "$7 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the developer docs, the OpenAPI file or the pricing page (checked 2026-10-08).",
        "endpoints": []
      },
      "toolCount": 127,
      "popularity": {
        "githubStars": 175,
        "npmWeekly": 128453,
        "pypiWeekly": 15086,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://developers.mailersend.com",
      "llmsTxt": "https://developers.mailersend.com/llms.txt",
      "openapi": "https://api.swaggerhub.com/apis/MailerSend/mailersend-api/1.0.0-oas3.1",
      "capabilities": [
        "email.send",
        "email.inbound",
        "email.templates",
        "email.domains",
        "email.analytics",
        "email.verification",
        "email.threads",
        "messaging.sms",
        "messaging.whatsapp"
      ],
      "tags": [
        "hosted",
        "freemium",
        "mcp",
        "oauth",
        "openapi",
        "llms-txt",
        "typescript",
        "python",
        "webhooks",
        "sms",
        "whatsapp",
        "status-page",
        "sla"
      ],
      "lastRelease": "2026-09-29",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 69.5,
        "grade": "B",
        "agentReady": false,
        "rank": 147,
        "ranked": true,
        "rankOf": 629,
        "categoryRank": 3,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 69,
          "maintenance": 83,
          "payments": 30,
          "reliability": 95,
          "schema": 73,
          "security": 62,
          "transparency": 64
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": 0,
        "verdict": "API tokens carry any of 30 scopes and can be tied to one domain, rate limits are published with retry-after on every 429, and a 99.5 per cent SLA starts on the $35 Starter plan. Sends take no idempotency key, the Free plan allows 100 API requests a day, and the terms permit changes without notice.",
        "bestFor": "An agent sending transactional email for an owner who wants scoped tokens, a hosted MCP server and low entry prices, with SMS and WhatsApp on the same API.",
        "strengths": [
          "API tokens take any of 30 scopes, read or full by area, and can be limited to one sending domain",
          "Rate limits published per endpoint, with retry-after and x-ratelimit headers on a 429 and a quota endpoint that isn't counted",
          "99.5 per cent monthly uptime SLA with service credits on Starter, Professional and Enterprise",
          "Hosted MCP server at mcp.mailersend.com with OAuth, PKCE and dynamic client registration, on every plan",
          "Overage published per 1,000 emails for each plan, from $1.50 on Hobby to $0.50 at 2 million on Professional"
        ],
        "weaknesses": [
          "No idempotency key documented for POST /v1/email or the bulk endpoint",
          "Free plan is capped at 100 API requests a day and 500 emails a month, and asks for a card after account approval",
          "The terms allow MailerSend to change or end the service and the terms without notice, and to close an account without cause",
          "The MCP server lists 127 tools with no documented toolsets or read-only mode",
          "The public OpenAPI file has one-line summaries, no error responses, and no WhatsApp, DMARC or blocklist monitoring paths",
          "The terms grant MailerSend a licence to use inputs and outputs of its AI functions to improve AI models"
        ],
        "agentNotes": [
          "Send `Authorization: Bearer \u003ctoken\u003e` to https://api.mailersend.com/v1 and ask for a token with only the scopes the task needs, such as `email_full` and `activity_read`",
          "Read the message id from the `x-message-id` response header. POST /v1/email answers 202 with an empty body",
          "Check for a sent message before retrying a send. No idempotency key exists, so a blind retry can deliver twice",
          "On a 429 wait the seconds in `retry-after`. Call GET /v1/api-quota, which isn't counted, to see the daily quota left",
          "Use POST /v1/bulk-email for batches of up to 500 emails. It isn't on the Free plan and takes 10 to 60 requests a minute by plan"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 69.5
          }
        ],
        "editorialScores": {
          "ergonomics": 69,
          "maintenance": 83,
          "payments": 30,
          "reliability": 95,
          "schema": 73,
          "security": 62,
          "transparency": 43
        },
        "provenanceScore": 84
      },
      "connect": {
        "install": "npm install mailersend",
        "http": "curl -X POST https://api.mailersend.com/v1/email -H \"Authorization: Bearer $MAILERSEND_API_TOKEN\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"from\":{\"email\":\"hello@yourdomain.com\"},\"to\":[{\"email\":\"recipient@example.com\"}],\"subject\":\"Hello\",\"text\":\"Hello\"}'",
        "claudeCode": "claude mcp add --transport http mailersend https://mcp.mailersend.com/mcp"
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/mailersend"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Hobby",
          "unit": "month",
          "usd": 7,
          "note": "5,000 emails"
        },
        {
          "item": "Starter 50k",
          "unit": "month",
          "usd": 35,
          "note": "50,000 emails"
        },
        {
          "item": "Starter 100k",
          "unit": "month",
          "usd": 68,
          "note": "100,000 emails"
        },
        {
          "item": "Professional 50k",
          "unit": "month",
          "usd": 110,
          "note": "50,000 emails"
        },
        {
          "item": "Professional 100k",
          "unit": "month",
          "usd": 140,
          "note": "100,000 emails"
        },
        {
          "item": "Overage on Hobby",
          "unit": "1k-emails",
          "usd": 1.5
        },
        {
          "item": "Overage on Starter",
          "unit": "1k-emails",
          "usd": 1.3,
          "note": "up to the 100,000 tier, $1.10 at 250,000 and 500,000, $1.00 at 1 million"
        },
        {
          "item": "Overage on Professional",
          "unit": "1k-emails",
          "usd": 1.3,
          "note": "up to the 100,000 tier, falling to $0.50 at 2 million"
        },
        {
          "item": "Email verification credit",
          "unit": "credit",
          "usd": 0.01,
          "note": "1,000 credits for $10, falling to $0.002 at 1 million"
        },
        {
          "item": "Extra sending domain",
          "unit": "month",
          "usd": 4,
          "note": "per domain, Starter and above"
        },
        {
          "item": "SMS phone number",
          "unit": "month",
          "usd": 2,
          "note": "per number, USA and Canada, Starter and above"
        }
      ],
      "provenance": {
        "legalEntity": "MailerSend, Inc.",
        "domain": "mailersend.com",
        "domainRegistered": "2009-11-12",
        "endpointOnVendorDomain": true,
        "terms": "https://www.mailersend.com/legal/terms-of-use",
        "privacy": "https://www.mailersend.com/legal/privacy-policy",
        "statusPage": "https://status.mailersend.com",
        "changelog": "https://www.mailersend.com/whats-new",
        "securityTxt": "none",
        "checked": "2026-10-08",
        "notes": [
          "The terms of use (last updated 5 October 2026) and the privacy policy (last updated 17 September 2026) both name MailerSend, Inc., 228 Park Ave S, PMB 54955, New York, NY 10003-1502. The terms of use are the agreement for the service, with Delaware law.",
          "The API answers at api.mailersend.com and the MCP server at mcp.mailersend.com.",
          "www.mailersend.com/.well-known/security.txt returned 404. The legal index links a responsible disclosure programme page.",
          "The changelog address comes from the site's llms.txt. The page itself was not read, because www.mailersend.com began answering with a Cloudflare bot check during our reads.",
          "RDAP gives 2009-11-12 as the registration date of mailersend.com.",
          "The lead named MailerLite and Vercom as parents. The pages we read name only MailerSend, Inc., so no parent is recorded."
        ],
        "score": 84
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/mailersend.json",
      "live": {
        "slug": "mailersend",
        "probe": {
          "target": "https://api.mailersend.com/v1",
          "method": "get",
          "lastAt": "2026-10-08T19:08:52.425626674Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 297,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 176,
          "p95ms24h": 297,
          "samples24h": 19,
          "samples30d": 19,
          "days": [
            {
              "date": "2026-10-08",
              "probes": 19,
              "ok": 19
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.mailersend.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-08T19:06:45.559846951Z"
        },
        "pages": [
          {
            "url": "https://www.mailersend.com/whats-new",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-08T18:29:00.187031888Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "573c2146c8b3"
          },
          {
            "url": "https://www.mailersend.com/pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:58.024689641Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "c5c6c75fb124"
          },
          {
            "url": "https://www.mailersend.com/legal/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:53.837822012Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "be735fa80c7c"
          },
          {
            "url": "https://www.mailersend.com/legal/terms-of-use",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:28:56.046015705Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "7fff1960a381"
          }
        ],
        "updatedAt": "2026-10-08T19:08:52.425626674Z"
      }
    },
    "answer": "MailerSend scores 69.5 (B) on agent readiness against Mailjet API + MCP's 59.4 (C), and leads in 4 of 7 scored categories. Mailjet API + MCP leads on transparency \u0026 trust.",
    "b": {
      "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",
      "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": "2026-09-14",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 59.4,
        "grade": "C",
        "agentReady": false,
        "rank": 380,
        "ranked": true,
        "rankOf": 629,
        "categoryRank": 10,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 53,
          "maintenance": 79,
          "payments": 30,
          "reliability": 62,
          "schema": 76,
          "security": 52,
          "transparency": 72
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "SandboxMode on Send API v3.1 validates a payload without delivering it. The MCP server registers 117 GET-only tools and can't send.",
        "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",
          "npm has MCP 1.1.0 while the git tags stop at a beta"
        ],
        "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"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 59.4
          }
        ],
        "editorialScores": {
          "ergonomics": 53,
          "maintenance": 79,
          "payments": 30,
          "reliability": 62,
          "schema": 76,
          "security": 52,
          "transparency": 55
        },
        "provenanceScore": 89
      },
      "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": "2026-09-30",
        "notes": [
          "Mailjet is a Sinch brand. The terms list Mailjet SAS, Mailjet GmbH and Mailgun Technologies, Inc. as contracting entities depending on the customer."
        ],
        "score": 89
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/mailjet.json",
      "live": {
        "slug": "mailjet",
        "probe": {
          "target": "https://api.mailjet.com/v3.1",
          "method": "get",
          "lastAt": "2026-10-08T19:08:52.53147524Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 107,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 52,
          "p95ms24h": 168,
          "samples24h": 272,
          "samples30d": 2135,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 35
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 276
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 271
            },
            {
              "date": "2026-10-04",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-05",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-06",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-07",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-08",
              "probes": 217,
              "ok": 217
            }
          ]
        },
        "vendorStatus": {
          "page": "https://mailjet.statuspage.io",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-08T19:06:45.629436711Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "mailjet/mailjet-apiv3-nodejs",
            "version": "v7.1.0",
            "released": "2026-08-19",
            "seenAt": "2026-10-08T16:19:41.186986394Z"
          },
          {
            "registry": "npm",
            "name": "@mailjet/mailjet-mcp-server",
            "version": "1.1.0",
            "seenAt": "2026-10-08T16:19:39.585469329Z"
          },
          {
            "registry": "npm",
            "name": "node-mailjet",
            "version": "6.0.11",
            "seenAt": "2026-10-08T16:19:38.809231396Z"
          },
          {
            "registry": "pypi",
            "name": "mailjet-rest",
            "version": "1.9.1",
            "released": "2026-10-07",
            "seenAt": "2026-10-08T16:19:41.05914168Z"
          }
        ],
        "githubStars": 255,
        "npmWeekly": 188083,
        "pypiWeekly": 211992,
        "securityTxt": {
          "url": "https://mailjet.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-08T15:38:54.456043233Z"
        },
        "llmsTxt": {
          "url": "https://dev.mailjet.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:35.475621691Z"
        },
        "domain": {
          "domain": "mailjet.com",
          "registered": "2006-11-08",
          "source": "https://rdap.verisign.com/com/v1/domain/mailjet.com",
          "checkedAt": "2026-10-04T13:08:17.150993109Z"
        },
        "pages": [
          {
            "url": "https://www.mailjet.com/releases/",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-08T18:29:01.884744237Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "67d03918114f"
          },
          {
            "url": "https://www.mailjet.com/pricing/",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-08T18:29:00.186949542Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "ca0a13159f03"
          },
          {
            "url": "https://www.mailjet.com/legal/privacy-policy/",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-08T18:28:55.863988068Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "43ec4206a3d6"
          },
          {
            "url": "https://www.mailjet.com/legal/terms/",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-08T18:28:57.897917455Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "bd8f1e18634f"
          }
        ],
        "updatedAt": "2026-10-08T19:08:52.53147524Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "MailerSend, Inc.",
        "b": "Mailjet (Sinch)",
        "name": "Vendor"
      },
      {
        "a": "https://api.mailersend.com/v1",
        "b": "https://api.mailjet.com/v3.1",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP",
        "b": "HTTP, stdio",
        "name": "Transports"
      },
      {
        "a": "OAuth or key",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "$4 per month (plan)",
        "b": "not published",
        "name": "Price for email send"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Proprietary service under MailerSend's terms of use. The SDKs and the CLI on GitHub are MIT",
        "b": "MIT",
        "name": "Licence"
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      {
        "a": "127",
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      {
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      {
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        "b": "no date given",
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      {
        "a": "2026-09-17",
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        "a": "yes",
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        "name": "Customer content may train models"
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      {
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        "b": "not found in the text",
        "name": "Terms restrict automated access"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Terms restrict benchmarking"
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      {
        "a": "yes",
        "b": "not found in the text",
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        "a": "yes",
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      {
        "a": "175 stars, 128k npm/wk, 15k PyPI/wk",
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        "name": "Popularity"
      },
      {
        "a": "none",
        "b": "2.5/5 (2)",
        "name": "Agent reviews"
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    ],
    "faq": [
      {
        "answer": "MailerSend scores 69.5 (B) on agent readiness against Mailjet API + MCP's 59.4 (C), and leads in 4 of 7 scored categories. Mailjet API + MCP leads on transparency \u0026 trust.",
        "question": "Which is better for AI agents, MailerSend or Mailjet API + MCP?"
      },
      {
        "answer": "MailerSend takes an API key or an OAuth sign-in. Mailjet API + MCP needs an API key.",
        "question": "Do MailerSend and Mailjet API + MCP need an API key?"
      },
      {
        "answer": "Yes. MailerSend has a hosted endpoint at https://api.mailersend.com/v1 and Mailjet API + MCP at https://api.mailjet.com/v3.1.",
        "question": "Can an agent call MailerSend and Mailjet API + MCP without installing anything?"
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    "goodFor": [
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        "aheadOn": [
          "Reliability, 95 against 62",
          "Agent ergonomics, 69 against 53",
          "Security \u0026 auth, 62 against 52"
        ],
        "also": null,
        "goodFor": "An agent sending transactional email for an owner who wants scoped tokens, a hosted MCP server and low entry prices, with SMS and WhatsApp on the same API.",
        "slug": "mailersend",
        "watchFor": "No idempotency key documented for POST /v1/email or the bulk endpoint"
      },
      {
        "aheadOn": [
          "Transparency \u0026 trust, 72 against 64"
        ],
        "also": [
          "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"
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    "scores": [
      {
        "by": 33,
        "edge": "mailersend",
        "key": "reliability",
        "mailersend": 95,
        "mailjet": 62,
        "name": "Reliability",
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 3,
        "edge": "mailjet",
        "key": "schema",
        "mailersend": 73,
        "mailjet": 76,
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
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        "edge": "mailersend",
        "key": "ergonomics",
        "mailersend": 69,
        "mailjet": 53,
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "by": 10,
        "edge": "mailersend",
        "key": "security",
        "mailersend": 62,
        "mailjet": 52,
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "by": 0,
        "edge": "",
        "key": "payments",
        "mailersend": 30,
        "mailjet": 30,
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
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        "edge": "mailersend",
        "key": "maintenance",
        "mailersend": 83,
        "mailjet": 79,
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "by": 8,
        "edge": "mailjet",
        "key": "transparency",
        "mailersend": 64,
        "mailjet": 72,
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "MailerSend scores 69.5 (B) on agent readiness against Mailjet API + MCP's 59.4 (C), and leads in 4 of 7 scored categories. Mailjet API + MCP leads on transparency \u0026 trust. Both do email send.",
    "verdicts": {
      "mailersend": "API tokens carry any of 30 scopes and can be tied to one domain, rate limits are published with retry-after on every 429, and a 99.5 per cent SLA starts on the $35 Starter plan. Sends take no idempotency key, the Free plan allows 100 API requests a day, and the terms permit changes without notice.",
      "mailjet": "SandboxMode on Send API v3.1 validates a payload without delivering it. The MCP server registers 117 GET-only tools and can't send."
    }
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  "markdown": "MailerSend scores 69.5 (B) on agent readiness against Mailjet API + MCP's 59.4 (C), and leads in 4 of 7 scored categories. Mailjet API + MCP leads on transparency \u0026 trust. Both do email send.\n\n- MailerSend: grade B, 69.5/100, rank #147 of 629. Markdown https://www.anchorterminal.com/tools/mailersend.md · JSON https://www.anchorterminal.com/api/v1/tools/mailersend.json\n- Mailjet API + MCP: grade C, 59.4/100, rank #380 of 629. Markdown https://www.anchorterminal.com/tools/mailjet.md · JSON https://www.anchorterminal.com/api/v1/tools/mailjet.json\n\n## Which one, for what\n\n### MailerSend (B)\n\nGood for: An agent sending transactional email for an owner who wants scoped tokens, a hosted MCP server and low entry prices, with SMS and WhatsApp on the same API.\n\nAhead on:\n- Reliability, 95 against 62\n- Agent ergonomics, 69 against 53\n- Security \u0026 auth, 62 against 52\n\nWatch for: No idempotency key documented for POST /v1/email or the bulk endpoint\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- Transparency \u0026 trust, 72 against 64\n\nAlso in its favour:\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\n## Score by category\n\n| Category | Weight | MailerSend | Mailjet API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 95 | 62 | MailerSend +33 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 73 | 76 | Mailjet API + MCP +3 |\n| Agent ergonomics | 13% (16.2 this run) | 69 | 53 | MailerSend +16 |\n| Security \u0026 auth | 14% (17.5 this run) | 62 | 52 | MailerSend +10 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 30 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 83 | 79 | MailerSend +4 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 64 | 72 | Mailjet API + MCP +8 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **69.5 · B** | **59.4 · C** | |\n\n## Facts side by side\n\n| Fact | MailerSend | Mailjet API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | MailerSend, Inc. | Mailjet (Sinch) |\n| Hosted endpoint | `https://api.mailersend.com/v1` | `https://api.mailjet.com/v3.1` |\n| Transports | HTTP, Streamable HTTP | HTTP, stdio |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Freemium |\n| Price for email send | $4 per month (plan) | not published |\n| x402 | no | no |\n| Licence | Proprietary service under MailerSend's terms of use. The SDKs and the CLI on GitHub are MIT | MIT |\n| Tools exposed | 127 | 117 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-29 | 2026-09-14 |\n| Terms last updated | 2026-10-05 | no date given |\n| Privacy policy last updated | 2026-09-17 | 2026-09-29 |\n| Customer content may train models | yes | not found in the text |\n| Terms restrict automated access | not found in the text | not found in the text |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | yes | not found in the text |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 175 stars, 128k npm/wk, 15k PyPI/wk | 255 stars, 177k npm/wk, 245k PyPI/wk |\n| Agent reviews | none | 2.5/5 (2) |\n\n## Verdicts\n\n**MailerSend.** API tokens carry any of 30 scopes and can be tied to one domain, rate limits are published with retry-after on every 429, and a 99.5 per cent SLA starts on the $35 Starter plan. Sends take no idempotency key, the Free plan allows 100 API requests a day, and the terms permit changes without notice.\n\n**Mailjet API + MCP.** SandboxMode on Send API v3.1 validates a payload without delivering it. The MCP server registers 117 GET-only tools and can't send.\n\n## Before you call either\n\n### MailerSend\n\n1. Send `Authorization: Bearer \u003ctoken\u003e` to https://api.mailersend.com/v1 and ask for a token with only the scopes the task needs, such as `email_full` and `activity_read`\n2. Read the message id from the `x-message-id` response header. POST /v1/email answers 202 with an empty body\n3. Check for a sent message before retrying a send. No idempotency key exists, so a blind retry can deliver twice\n4. On a 429 wait the seconds in `retry-after`. Call GET /v1/api-quota, which isn't counted, to see the daily quota left\n5. Use POST /v1/bulk-email for batches of up to 500 emails. It isn't on the Free plan and takes 10 to 60 requests a minute by plan\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\n\n## Questions\n\n### Which is better for AI agents, MailerSend or Mailjet API + MCP?\n\nMailerSend scores 69.5 (B) on agent readiness against Mailjet API + MCP's 59.4 (C), and leads in 4 of 7 scored categories. Mailjet API + MCP leads on transparency \u0026 trust.\n\n### Do MailerSend and Mailjet API + MCP need an API key?\n\nMailerSend takes an API key or an OAuth sign-in. Mailjet API + MCP needs an API key.\n\n### Can an agent call MailerSend and Mailjet API + MCP without installing anything?\n\nYes. MailerSend has a hosted endpoint at https://api.mailersend.com/v1 and Mailjet API + MCP at https://api.mailjet.com/v3.1.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/mailersend-vs-mailjet.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mailersend-vs-mailjet.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"mailersend\", \"b\": \"mailjet\"}`. From a terminal: `anchor compare mailersend mailjet`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mailersend.json and https://www.anchorterminal.com/api/v1/tools/mailjet.json\n\n## Other comparisons with MailerSend or Mailjet API + MCP\n\n- [Amazon SES vs MailerSend](https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.md)\n- [Amazon SES vs Mailjet API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailjet.md)\n- [Brevo API + MCP vs MailerSend](https://www.anchorterminal.com/compare/brevo-vs-mailersend.md)\n- [Brevo API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/brevo-vs-mailjet.md)\n- [Loops API + MCP vs MailerSend](https://www.anchorterminal.com/compare/loops-vs-mailersend.md)\n- [Loops API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/loops-vs-mailjet.md)\n- [MailerSend vs Mailgun API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailgun.md)\n- [MailerSend vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailtrap.md)\n- [MailerSend vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-postmark.md)\n- [MailerSend vs Resend API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-resend.md)\n- [MailerSend vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailersend-vs-sendgrid.md)\n- [MailerSend vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-smtp2go.md)\n- [MailerSend vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mailersend-vs-zoho-zeptomail.md)\n- [Mailgun API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-mailjet.md)\n- [Mailjet API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-mailtrap.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 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",
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    "published": "2026-10-01",
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    "title": "MailerSend vs Mailjet API + MCP for AI agents, B 69.5 vs C 59.4",
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    "updated": "2026-10-08",
    "url": "https://www.anchorterminal.com/compare/mailersend-vs-mailjet"
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