{
  "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 Twilio SendGrid's 63.6 (B), and leads in 4 of 7 scored categories. Twilio SendGrid leads on security \u0026 auth and transparency \u0026 trust.",
    "b": {
      "slug": "sendgrid",
      "name": "Twilio SendGrid",
      "vendor": "Twilio",
      "vendorUrl": "https://sendgrid.com",
      "kind": "http-api",
      "category": "email",
      "summary": "Email API v3 for transactional mail, with Inbound Parse, dynamic templates, suppressions and Marketing Campaigns.",
      "url": "https://www.anchorterminal.com/tools/sendgrid",
      "markdownUrl": "https://www.anchorterminal.com/tools/sendgrid.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/sendgrid.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/sendgrid.json",
      "repo": "https://github.com/sendgrid/sendgrid-nodejs",
      "license": "MIT",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://api.sendgrid.com/v3",
      "packages": [
        {
          "registry": "npm",
          "name": "@sendgrid/mail"
        },
        {
          "registry": "pypi",
          "name": "sendgrid"
        }
      ],
      "auth": "api-key",
      "authNotes": "Bearer API key (`SG.`) with full, restricted or billing access and per-scope permissions. Subusers get their own keys.",
      "pricing": "paid",
      "pricingNotes": "Free trial of 100 emails a day for 60 days, no card. Essentials $19.95 a month for 50,000 emails or $34.95 for 100,000. Pro $89.95 for 100,000, $249 for 300,000 and $499 for 700,000, with a dedicated IP and 2,500 validations. Premier is custom. Overage rates aren't listed on the pricing page (https://www.twilio.com/en-us/products/email-api/pricing).",
      "priceSummary": "$19.95 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 3052,
        "npmWeekly": 5457252,
        "pypiWeekly": 4577455,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://www.twilio.com/docs/sendgrid",
      "llmsTxt": "https://www.twilio.com/docs/llms.txt",
      "openapi": "https://raw.githubusercontent.com/twilio/sendgrid-oai/main/spec/json/tsg_mail_v3.json",
      "capabilities": [
        "email.send",
        "email.inbound",
        "email.templates",
        "email.domains",
        "email.analytics",
        "email.marketing"
      ],
      "tags": [
        "hosted",
        "no-card",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "webhooks",
        "enterprise"
      ],
      "lastRelease": "2025-09-19",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 63.6,
        "grade": "B",
        "agentReady": false,
        "rank": 275,
        "ranked": true,
        "rankOf": 629,
        "categoryRank": 7,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 60,
          "maintenance": 47,
          "payments": 30,
          "reliability": 66,
          "schema": 72,
          "security": 81,
          "transparency": 79
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Restricted API keys with per-endpoint scopes, subuser keys and IP access management. No official MCP server that can send, only Twilio's docs search.",
        "bestFor": "Teams already on Twilio, or that want Marketing Campaigns, subusers and fine-grained keys in one account.",
        "strengths": [
          "Restricted API keys with per-endpoint scopes, subuser keys and IP access management",
          "OpenAPI 3.1 specs for the whole v3 API",
          "Inbound Parse and Marketing Campaigns in one account",
          "Twilio SOC 2 Type II, ISO 27001 and a HackerOne bug bounty",
          "Subprocessors listed with locations, updated September 2026"
        ],
        "weaknesses": [
          "No official MCP server that can send, only Twilio's docs search",
          "Node and Python SDKs last released on 19 September 2025, Go on 29 May 2025",
          "Free plan is a 60-day trial, not a standing free tier",
          "Overage rates and numeric rate limits aren't published",
          "No idempotency key on mail/send"
        ],
        "agentNotes": [
          "Give an agent that only sends a restricted key with just `mail.send`",
          "Set `mail_settings.sandbox_mode` to validate payloads without delivery",
          "Authenticate a domain or verify a single sender before the first send",
          "Read X-RateLimit-Remaining and X-RateLimit-Reset and wait for the reset on 429",
          "Don't blindly retry a timed-out mail/send. There's no idempotency key, so the message can go out twice"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 63.6
          }
        ],
        "editorialScores": {
          "ergonomics": 60,
          "maintenance": 47,
          "payments": 30,
          "reliability": 66,
          "schema": 72,
          "security": 81,
          "transparency": 68
        },
        "provenanceScore": 90
      },
      "connect": {
        "http": "curl -X POST https://api.sendgrid.com/v3/mail/send -H \"Authorization: Bearer $SENDGRID_API_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"personalizations\":[{\"to\":[{\"email\":\"to@example.com\"}]}],\"from\":{\"email\":\"from@example.com\"},\"subject\":\"Hello\",\"content\":[{\"type\":\"text/plain\",\"value\":\"Hello\"}]}'"
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/sendgrid"
      },
      "sameCompany": [
        "twilio-voice",
        "stytch-connected-apps",
        "twilio"
      ],
      "area": "communication",
      "unitPrices": [
        {
          "item": "Essentials 50k",
          "unit": "month",
          "usd": 19.95,
          "note": "50,000 emails"
        },
        {
          "item": "Essentials 100k",
          "unit": "month",
          "usd": 34.95,
          "note": "100,000 emails"
        },
        {
          "item": "Pro 100k",
          "unit": "month",
          "usd": 89.95,
          "note": "100,000 emails, 1 dedicated IP"
        },
        {
          "item": "Pro 300k",
          "unit": "month",
          "usd": 249,
          "note": "300,000 emails"
        },
        {
          "item": "Pro 700k",
          "unit": "month",
          "usd": 499,
          "note": "700,000 emails"
        }
      ],
      "provenance": {
        "legalEntity": "Twilio Inc.",
        "domain": "sendgrid.com",
        "domainRegistered": "2009-04-20",
        "endpointOnVendorDomain": true,
        "terms": "https://www.twilio.com/en-us/legal/tos",
        "privacy": "https://www.twilio.com/en-us/legal/privacy",
        "statusPage": "https://status.twilio.com",
        "changelog": "https://www.twilio.com/en-us/changelog",
        "securityTxt": "unknown",
        "checked": "2026-09-30",
        "notes": [
          "sendgrid.com returns 403 for /.well-known/security.txt, and sendgrid.com pricing now redirects to twilio.com."
        ],
        "score": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/sendgrid.json",
      "live": {
        "slug": "sendgrid",
        "probe": {
          "target": "https://api.sendgrid.com/v3",
          "method": "get",
          "lastAt": "2026-10-08T19:08:58.192610812Z",
          "lastOk": true,
          "lastStatus": 401,
          "lastMs": 199,
          "lastNote": "asks for credentials",
          "authRequired": true,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 159,
          "p95ms24h": 260,
          "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://status.twilio.com",
          "indicator": "minor",
          "summary": "Partially Degraded Service",
          "checkedAt": "2026-10-08T19:06:58.58839565Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "sendgrid/sendgrid-nodejs",
            "version": "8.1.6",
            "released": "2025-09-19",
            "seenAt": "2026-10-08T16:28:49.3558642Z"
          },
          {
            "registry": "npm",
            "name": "@sendgrid/mail",
            "version": "8.1.6",
            "seenAt": "2026-10-08T16:28:48.44008455Z"
          },
          {
            "registry": "pypi",
            "name": "sendgrid",
            "version": "6.12.5",
            "released": "2025-09-19",
            "seenAt": "2026-10-08T16:28:49.242685263Z"
          }
        ],
        "githubStars": 3052,
        "npmWeekly": 5744754,
        "pypiWeekly": 4996856,
        "securityTxt": {
          "url": "https://sendgrid.com/.well-known/security.txt",
          "state": "unknown",
          "checkedAt": "2026-10-08T15:38:35.229818646Z"
        },
        "llmsTxt": {
          "url": "https://www.twilio.com/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:52.040188642Z"
        },
        "domain": {
          "domain": "sendgrid.com",
          "registered": "2009-04-20",
          "source": "https://rdap.verisign.com/com/v1/domain/sendgrid.com",
          "checkedAt": "2026-10-04T13:05:08.539043451Z"
        },
        "pages": [
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            "checkedAt": "2026-10-08T18:31:05.564395484Z",
            "changedAt": "2026-10-07T18:14:10.937244949Z",
            "fingerprint": "51737322225d"
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          {
            "url": "https://www.twilio.com/en-us/products/email-api/pricing",
            "kind": "pricing",
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            "changedAt": "2026-10-03T15:40:29.339427666Z",
            "fingerprint": "d7367bb506a5"
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          {
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            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-08T18:31:08.120395446Z",
            "changedAt": "2026-10-08T18:31:08.120395446Z",
            "fingerprint": "6da0cfe3eb8e"
          },
          {
            "url": "https://www.twilio.com/en-us/legal/tos",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:31:10.230391682Z",
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            "fingerprint": "2a9a14fa11bf"
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        "updatedAt": "2026-10-08T19:08:58.192610812Z"
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        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
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      {
        "a": "MailerSend, Inc.",
        "b": "Twilio",
        "name": "Vendor"
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      {
        "a": "https://api.mailersend.com/v1",
        "b": "https://api.sendgrid.com/v3",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP",
        "b": "HTTP",
        "name": "Transports"
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      {
        "a": "OAuth or key",
        "b": "API key",
        "name": "Auth"
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      {
        "a": "Freemium",
        "b": "Paid",
        "name": "Pricing"
      },
      {
        "a": "$4 per month (plan)",
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      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
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      {
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        "b": "MIT",
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      {
        "a": "127",
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        "b": "not found in the text",
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      {
        "a": "not found in the text",
        "b": "not found in the text",
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        "name": "Popularity"
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        "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 Twilio SendGrid's 63.6 (B), and leads in 4 of 7 scored categories. Twilio SendGrid leads on security \u0026 auth and transparency \u0026 trust.",
        "question": "Which is better for AI agents, MailerSend or Twilio SendGrid?"
      },
      {
        "answer": "MailerSend takes an API key or an OAuth sign-in. Twilio SendGrid needs an API key.",
        "question": "Do MailerSend and Twilio SendGrid need an API key?"
      },
      {
        "answer": "Yes. MailerSend has a hosted endpoint at https://api.mailersend.com/v1 and Twilio SendGrid at https://api.sendgrid.com/v3.",
        "question": "Can an agent call MailerSend and Twilio SendGrid without installing anything?"
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    "goodFor": [
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          "Reliability, 95 against 66",
          "Agent ergonomics, 69 against 60",
          "Maintenance \u0026 community, 83 against 47"
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        "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.",
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      },
      {
        "aheadOn": [
          "Security \u0026 auth, 81 against 62",
          "Transparency \u0026 trust, 79 against 64"
        ],
        "also": [
          "Free to start without a card"
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        "goodFor": "Teams already on Twilio, or that want Marketing Campaigns, subusers and fine-grained keys in one account.",
        "slug": "sendgrid",
        "watchFor": "No official MCP server that can send, only Twilio's docs search"
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    "scores": [
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        "by": 29,
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        "key": "reliability",
        "mailersend": 95,
        "name": "Reliability",
        "sendgrid": 66,
        "weight": 16
      },
      {
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        "name": "Performance",
        "pending": true,
        "weight": 10
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      {
        "by": 1,
        "edge": "mailersend",
        "key": "schema",
        "mailersend": 73,
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        "sendgrid": 72,
        "weight": 13
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        "edge": "mailersend",
        "key": "ergonomics",
        "mailersend": 69,
        "name": "Agent ergonomics",
        "sendgrid": 60,
        "weight": 13
      },
      {
        "by": 19,
        "edge": "sendgrid",
        "key": "security",
        "mailersend": 62,
        "name": "Security \u0026 auth",
        "sendgrid": 81,
        "weight": 14
      },
      {
        "by": 0,
        "edge": "",
        "key": "payments",
        "mailersend": 30,
        "name": "Payments \u0026 pricing",
        "sendgrid": 30,
        "weight": 10
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        "pending": true,
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        "edge": "mailersend",
        "key": "maintenance",
        "mailersend": 83,
        "name": "Maintenance \u0026 community",
        "sendgrid": 47,
        "weight": 7
      },
      {
        "by": 15,
        "edge": "sendgrid",
        "key": "transparency",
        "mailersend": 64,
        "name": "Transparency \u0026 trust",
        "sendgrid": 79,
        "weight": 7
      }
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    "summary": "MailerSend scores 69.5 (B) on agent readiness against Twilio SendGrid's 63.6 (B), and leads in 4 of 7 scored categories. Twilio SendGrid leads on security \u0026 auth and 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.",
      "sendgrid": "Restricted API keys with per-endpoint scopes, subuser keys and IP access management. No official MCP server that can send, only Twilio's docs search."
    }
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  "markdown": "MailerSend scores 69.5 (B) on agent readiness against Twilio SendGrid's 63.6 (B), and leads in 4 of 7 scored categories. Twilio SendGrid leads on security \u0026 auth and 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- Twilio SendGrid: grade B, 63.6/100, rank #275 of 629. Markdown https://www.anchorterminal.com/tools/sendgrid.md · JSON https://www.anchorterminal.com/api/v1/tools/sendgrid.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 66\n- Agent ergonomics, 69 against 60\n- Maintenance \u0026 community, 83 against 47\n\nWatch for: No idempotency key documented for POST /v1/email or the bulk endpoint\n\n### Twilio SendGrid (B)\n\nGood for: Teams already on Twilio, or that want Marketing Campaigns, subusers and fine-grained keys in one account.\n\nAhead on:\n- Security \u0026 auth, 81 against 62\n- Transparency \u0026 trust, 79 against 64\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: No official MCP server that can send, only Twilio's docs search\n\n\n## Score by category\n\n| Category | Weight | MailerSend | Twilio SendGrid | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 95 | 66 | MailerSend +29 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 73 | 72 | MailerSend +1 |\n| Agent ergonomics | 13% (16.2 this run) | 69 | 60 | MailerSend +9 |\n| Security \u0026 auth | 14% (17.5 this run) | 62 | 81 | Twilio SendGrid +19 |\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 | 47 | MailerSend +36 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 64 | 79 | Twilio SendGrid +15 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **69.5 · B** | **63.6 · B** | |\n\n## Facts side by side\n\n| Fact | MailerSend | Twilio SendGrid |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | MailerSend, Inc. | Twilio |\n| Hosted endpoint | `https://api.mailersend.com/v1` | `https://api.sendgrid.com/v3` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Paid |\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 | none |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-29 | 2025-09-19 |\n| Terms last updated | 2026-10-05 | 2026-07-16 |\n| Privacy policy last updated | 2026-09-17 | 2026-04-09 |\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 | 3.1k stars, 5.5M npm/wk, 4.6M 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**Twilio SendGrid.** Restricted API keys with per-endpoint scopes, subuser keys and IP access management. No official MCP server that can send, only Twilio's docs search.\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### Twilio SendGrid\n\n1. Give an agent that only sends a restricted key with just `mail.send`\n2. Set `mail_settings.sandbox_mode` to validate payloads without delivery\n3. Authenticate a domain or verify a single sender before the first send\n4. Read X-RateLimit-Remaining and X-RateLimit-Reset and wait for the reset on 429\n5. Don't blindly retry a timed-out mail/send. There's no idempotency key, so the message can go out twice\n\n## Questions\n\n### Which is better for AI agents, MailerSend or Twilio SendGrid?\n\nMailerSend scores 69.5 (B) on agent readiness against Twilio SendGrid's 63.6 (B), and leads in 4 of 7 scored categories. Twilio SendGrid leads on security \u0026 auth and transparency \u0026 trust.\n\n### Do MailerSend and Twilio SendGrid need an API key?\n\nMailerSend takes an API key or an OAuth sign-in. Twilio SendGrid needs an API key.\n\n### Can an agent call MailerSend and Twilio SendGrid without installing anything?\n\nYes. MailerSend has a hosted endpoint at https://api.mailersend.com/v1 and Twilio SendGrid at https://api.sendgrid.com/v3.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/mailersend-vs-sendgrid.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mailersend-vs-sendgrid.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"mailersend\", \"b\": \"sendgrid\"}`. From a terminal: `anchor compare mailersend sendgrid`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mailersend.json and https://www.anchorterminal.com/api/v1/tools/sendgrid.json\n\n## Other comparisons with MailerSend or Twilio SendGrid\n\n- [Amazon SES vs MailerSend](https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.md)\n- [Amazon SES vs Twilio SendGrid](https://www.anchorterminal.com/compare/amazon-ses-vs-sendgrid.md)\n- [Brevo API + MCP vs MailerSend](https://www.anchorterminal.com/compare/brevo-vs-mailersend.md)\n- [Brevo API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/brevo-vs-sendgrid.md)\n- [Loops API + MCP vs MailerSend](https://www.anchorterminal.com/compare/loops-vs-mailersend.md)\n- [Loops API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/loops-vs-sendgrid.md)\n- [MailerSend vs Mailgun API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailgun.md)\n- [MailerSend vs Mailjet API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailjet.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 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 Twilio SendGrid](https://www.anchorterminal.com/compare/mailgun-vs-sendgrid.md)\n- [Mailjet API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailjet-vs-sendgrid.md)\n- [Mailtrap Email API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailtrap-vs-sendgrid.md)\n- [Postmark API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/postmark-vs-sendgrid.md)\n- [Resend API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/resend-vs-sendgrid.md)\n- [Twilio SendGrid vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/sendgrid-vs-smtp2go.md)\n- [Twilio SendGrid vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/sendgrid-vs-zoho-zeptomail.md)\n",
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    "section": "tools",
    "title": "MailerSend vs Twilio SendGrid for AI agents, B 69.5 vs B 63.6",
    "toc": null,
    "updated": "2026-10-08",
    "url": "https://www.anchorterminal.com/compare/mailersend-vs-sendgrid"
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