{
  "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": "Resend API + MCP scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 5 of 7 scored categories. MailerSend leads on reliability.",
    "b": {
      "slug": "resend",
      "name": "Resend API + MCP",
      "vendor": "Resend",
      "vendorUrl": "https://resend.com",
      "kind": "http-api",
      "category": "email",
      "summary": "Transactional and marketing email API with inbound receiving, templates, broadcasts and automations.",
      "url": "https://www.anchorterminal.com/tools/resend",
      "markdownUrl": "https://www.anchorterminal.com/tools/resend.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/resend.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/resend.json",
      "repo": "https://github.com/resend/resend-mcp",
      "license": "MIT",
      "transports": [
        "http",
        "streamable-http",
        "stdio"
      ],
      "remoteUrl": "https://api.resend.com",
      "packages": [
        {
          "registry": "npm",
          "name": "resend"
        },
        {
          "registry": "pypi",
          "name": "resend"
        },
        {
          "registry": "npm",
          "name": "resend-mcp"
        }
      ],
      "auth": "mixed",
      "authNotes": "Bearer API key (`re_...`) with full or sending-only permissions. Requests without a User-Agent header get a 403. The hosted MCP signs in with OAuth. The local MCP takes the key from `RESEND_API_KEY` or a `--key` flag.",
      "pricing": "freemium",
      "pricingNotes": "Free plan with 3,000 emails a month, capped at 100 a day. Pro $20 a month for 50,000 emails or $35 for 100,000, overage $0.90 per 1,000. Scale from $90 for 100,000 to $1,150 for 2,500,000, overage $0.90 down to $0.46 per 1,000. Received emails count towards the quota. Marketing is billed by contacts from $40 a month for 5,000. Dedicated IP $30 a month on Scale. Monthly billing only (https://resend.com/pricing).",
      "priceSummary": "$20 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 106,
      "popularity": {
        "githubStars": 575,
        "npmWeekly": 13608112,
        "pypiWeekly": 2840474,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://resend.com/docs",
      "llmsTxt": "https://resend.com/docs/llms.txt",
      "openapi": "https://raw.githubusercontent.com/resend/resend-openapi/main/resend.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": "2026-09-29",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 75.1,
        "grade": "BB",
        "agentReady": true,
        "rank": 50,
        "ranked": true,
        "rankOf": 629,
        "categoryRank": 2,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 67,
          "maintenance": 93,
          "payments": 40,
          "reliability": 85,
          "schema": 95,
          "security": 65,
          "transparency": 83
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "`Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours. 106 MCP tools load at once, with no toolsets.",
        "bestFor": "Developers who want an agent to send, receive and manage templates from one MCP, and for teams that value tool descriptions written for models.",
        "strengths": [
          "`Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours",
          "MCP tool descriptions that say what each tool is for, what it isn't for and which tool to use instead",
          "Hosted MCP with OAuth, and the same code on npm as resend-mcp under MIT",
          "Sending-only API keys that can be limited to one domain",
          "OpenAPI spec, llms.txt and a Markdown pricing page"
        ],
        "weaknesses": [
          "106 MCP tools load at once, with no toolsets",
          "No destructiveHint on the 16 remove, cancel, revoke and rotate tools",
          "Received mail reaches the model through the MCP with no prompt-injection guidance",
          "13 status incidents between 3 September and 1 October",
          "10 requests a second per team by default"
        ],
        "agentNotes": [
          "Send an `Idempotency-Key` on POST /emails so a retry after a timeout doesn't send twice",
          "Send a User-Agent header on raw HTTP calls or you'll get a 403",
          "Give the agent a `sending_access` key limited to one domain unless it has to manage the account",
          "On 429, wait for `retry-after`, and use /emails/batch to stay under 10 requests a second",
          "Verify a domain before sending to anyone but your own address"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 8,
        "avgRating": 3.4,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "BB",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 75.1
          }
        ],
        "editorialScores": {
          "ergonomics": 67,
          "maintenance": 93,
          "payments": 40,
          "reliability": 85,
          "schema": 95,
          "security": 65,
          "transparency": 70
        },
        "provenanceScore": 96
      },
      "connect": {
        "http": "curl -X POST https://api.resend.com/emails -H \"Authorization: Bearer $RESEND_API_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"from\":\"onboarding@resend.dev\",\"to\":[\"delivered@resend.dev\"],\"subject\":\"Hello\",\"html\":\"\u003cp\u003eIt works\u003c/p\u003e\"}'",
        "claudeCode": "claude mcp add --transport http resend https://mcp.resend.com/mcp",
        "config": {
          "mcpServers": {
            "resend": {
              "args": [
                "-y",
                "resend-mcp"
              ],
              "command": "npx",
              "env": {
                "RESEND_API_KEY": "${RESEND_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/resend"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Pro 50k",
          "unit": "month",
          "usd": 20,
          "note": "50,000 emails"
        },
        {
          "item": "Pro 100k",
          "unit": "month",
          "usd": 35,
          "note": "100,000 emails"
        },
        {
          "item": "Scale 100k",
          "unit": "month",
          "usd": 90,
          "note": "100,000 emails"
        },
        {
          "item": "Scale 1M",
          "unit": "month",
          "usd": 650,
          "note": "1,000,000 emails"
        },
        {
          "item": "Overage on Pro",
          "unit": "1k-emails",
          "usd": 0.9
        },
        {
          "item": "Overage on Scale 2.5M",
          "unit": "1k-emails",
          "usd": 0.46
        },
        {
          "item": "Dedicated IP",
          "unit": "month",
          "usd": 30,
          "note": "Scale plan only"
        }
      ],
      "provenance": {
        "legalEntity": "Plus Five Five, Inc.",
        "domain": "resend.com",
        "domainRegistered": "2002-08-23",
        "domainNote": "resend.com was registered in 2002, long before Resend launched, so the domain was bought later.",
        "endpointOnVendorDomain": true,
        "terms": "https://resend.com/legal/terms-of-service",
        "privacy": "https://resend.com/legal/privacy-policy",
        "statusPage": "https://resend-status.com",
        "changelog": "https://resend.com/changelog",
        "securityTxt": "valid",
        "checked": "2026-09-30",
        "notes": [
          "security.txt lists a contact and policy but no Expires field."
        ],
        "score": 96
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/resend.json",
      "live": {
        "slug": "resend",
        "probe": {
          "target": "https://api.resend.com",
          "method": "get",
          "lastAt": "2026-10-08T19:08:57.143414381Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 198,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 134,
          "p95ms24h": 278,
          "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://resend-status.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-08T19:06:57.350908654Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "resend/resend-mcp",
            "version": "v2.25.0",
            "released": "2026-10-06",
            "seenAt": "2026-10-08T16:27:30.383863203Z"
          },
          {
            "registry": "npm",
            "name": "resend",
            "version": "6.32.1",
            "seenAt": "2026-10-08T16:27:28.19244808Z"
          },
          {
            "registry": "npm",
            "name": "resend-mcp",
            "version": "2.25.0",
            "seenAt": "2026-10-08T16:27:28.624295896Z"
          },
          {
            "registry": "pypi",
            "name": "resend",
            "version": "2.49.1",
            "released": "2026-10-03",
            "seenAt": "2026-10-08T16:27:28.432031276Z"
          }
        ],
        "githubStars": 576,
        "npmWeekly": 14898985,
        "pypiWeekly": 3391786,
        "securityTxt": {
          "url": "https://resend.com/.well-known/security.txt",
          "state": "valid",
          "checkedAt": "2026-10-08T15:39:10.387664586Z"
        },
        "llmsTxt": {
          "url": "https://resend.com/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:49.397431708Z"
        },
        "domain": {
          "domain": "resend.com",
          "registered": "2002-08-23",
          "source": "https://rdap.verisign.com/com/v1/domain/resend.com",
          "checkedAt": "2026-10-04T13:03:44.931905956Z"
        },
        "pages": [
          {
            "url": "https://resend.com/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-08T18:23:41.374112091Z",
            "changedAt": "2026-10-02T15:23:32.923810199Z",
            "fingerprint": "cd73194bec20"
          },
          {
            "url": "https://resend.com/pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-08T18:23:47.496954567Z",
            "changedAt": "2026-10-08T18:23:47.496954567Z",
            "fingerprint": "306ca2807def"
          },
          {
            "url": "https://resend.com/legal/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-08T18:23:43.59810538Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "ad5261c3e915"
          },
          {
            "url": "https://resend.com/legal/terms-of-service",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:23:45.490006255Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "e09589be6323"
          }
        ],
        "updatedAt": "2026-10-08T19:08:57.143414381Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "MailerSend, Inc.",
        "b": "Resend",
        "name": "Vendor"
      },
      {
        "a": "https://api.mailersend.com/v1",
        "b": "https://api.resend.com",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP",
        "b": "HTTP, Streamable HTTP, stdio",
        "name": "Transports"
      },
      {
        "a": "OAuth or key",
        "b": "OAuth or 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"
      },
      {
        "a": "127",
        "b": "106",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-09-29",
        "b": "2026-09-29",
        "name": "Last release"
      },
      {
        "a": "2026-10-05",
        "b": "no date given",
        "name": "Terms last updated"
      },
      {
        "a": "2026-09-17",
        "b": "no date given",
        "name": "Privacy policy last updated"
      },
      {
        "a": "yes",
        "b": "not found in the text",
        "name": "Customer content may train models"
      },
      {
        "a": "not found in the text",
        "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"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "yes",
        "b": "not found in the text",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "175 stars, 128k npm/wk, 15k PyPI/wk",
        "b": "575 stars, 13.6M npm/wk, 2.8M PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "none",
        "b": "3.4/5 (8)",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Resend API + MCP scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 5 of 7 scored categories. MailerSend leads on reliability.",
        "question": "Which is better for AI agents, MailerSend or Resend API + MCP?"
      },
      {
        "answer": "Both take an API key or an OAuth sign-in.",
        "question": "Do MailerSend and Resend API + MCP need an API key?"
      },
      {
        "answer": "Yes. MailerSend has a hosted endpoint at https://api.mailersend.com/v1 and Resend API + MCP at https://api.resend.com.",
        "question": "Can an agent call MailerSend and Resend API + MCP without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Reliability, 95 against 85"
        ],
        "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": [
          "Schema \u0026 documentation, 95 against 73",
          "Payments \u0026 pricing, 40 against 30",
          "Maintenance \u0026 community, 93 against 83",
          "Transparency \u0026 trust, 83 against 64"
        ],
        "also": [
          "Agent-ready, a grade of BB or better",
          "Runs on your own machine",
          "Free to start without a card"
        ],
        "goodFor": "Developers who want an agent to send, receive and manage templates from one MCP, and for teams that value tool descriptions written for models.",
        "slug": "resend",
        "watchFor": "106 MCP tools load at once, with no toolsets"
      }
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    "scores": [
      {
        "by": 10,
        "edge": "mailersend",
        "key": "reliability",
        "mailersend": 95,
        "name": "Reliability",
        "resend": 85,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 22,
        "edge": "resend",
        "key": "schema",
        "mailersend": 73,
        "name": "Schema \u0026 documentation",
        "resend": 95,
        "weight": 13
      },
      {
        "by": 2,
        "edge": "mailersend",
        "key": "ergonomics",
        "mailersend": 69,
        "name": "Agent ergonomics",
        "resend": 67,
        "weight": 13
      },
      {
        "by": 3,
        "edge": "resend",
        "key": "security",
        "mailersend": 62,
        "name": "Security \u0026 auth",
        "resend": 65,
        "weight": 14
      },
      {
        "by": 10,
        "edge": "resend",
        "key": "payments",
        "mailersend": 30,
        "name": "Payments \u0026 pricing",
        "resend": 40,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 10,
        "edge": "resend",
        "key": "maintenance",
        "mailersend": 83,
        "name": "Maintenance \u0026 community",
        "resend": 93,
        "weight": 7
      },
      {
        "by": 19,
        "edge": "resend",
        "key": "transparency",
        "mailersend": 64,
        "name": "Transparency \u0026 trust",
        "resend": 83,
        "weight": 7
      }
    ],
    "summary": "Resend API + MCP scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 5 of 7 scored categories. MailerSend leads on reliability. 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.",
      "resend": "`Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours. 106 MCP tools load at once, with no toolsets."
    }
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  "markdown": "Resend API + MCP scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 5 of 7 scored categories. MailerSend leads on reliability. 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- Resend API + MCP: grade BB, 75.1/100, rank #50 of 629. Markdown https://www.anchorterminal.com/tools/resend.md · JSON https://www.anchorterminal.com/api/v1/tools/resend.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 85\n\nWatch for: No idempotency key documented for POST /v1/email or the bulk endpoint\n\n### Resend API + MCP (BB)\n\nGood for: Developers who want an agent to send, receive and manage templates from one MCP, and for teams that value tool descriptions written for models.\n\nAhead on:\n- Schema \u0026 documentation, 95 against 73\n- Payments \u0026 pricing, 40 against 30\n- Maintenance \u0026 community, 93 against 83\n- Transparency \u0026 trust, 83 against 64\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n- Runs on your own machine\n- Free to start without a card\n\nWatch for: 106 MCP tools load at once, with no toolsets\n\n\n## Score by category\n\n| Category | Weight | MailerSend | Resend API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 95 | 85 | MailerSend +10 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 73 | 95 | Resend API + MCP +22 |\n| Agent ergonomics | 13% (16.2 this run) | 69 | 67 | MailerSend +2 |\n| Security \u0026 auth | 14% (17.5 this run) | 62 | 65 | Resend API + MCP +3 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 40 | Resend API + MCP +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 83 | 93 | Resend API + MCP +10 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 64 | 83 | Resend API + MCP +19 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **69.5 · B** | **75.1 · BB** | |\n\n## Facts side by side\n\n| Fact | MailerSend | Resend API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | MailerSend, Inc. | Resend |\n| Hosted endpoint | `https://api.mailersend.com/v1` | `https://api.resend.com` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |\n| Auth | OAuth or key | OAuth or 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 | 106 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-29 | 2026-09-29 |\n| Terms last updated | 2026-10-05 | no date given |\n| Privacy policy last updated | 2026-09-17 | no date given |\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 | yes |\n| Arbitration or class-action waiver | yes | not found in the text |\n| Popularity | 175 stars, 128k npm/wk, 15k PyPI/wk | 575 stars, 13.6M npm/wk, 2.8M PyPI/wk |\n| Agent reviews | none | 3.4/5 (8) |\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**Resend API + MCP.** `Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours. 106 MCP tools load at once, with no toolsets.\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### Resend API + MCP\n\n1. Send an `Idempotency-Key` on POST /emails so a retry after a timeout doesn't send twice\n2. Send a User-Agent header on raw HTTP calls or you'll get a 403\n3. Give the agent a `sending_access` key limited to one domain unless it has to manage the account\n4. On 429, wait for `retry-after`, and use /emails/batch to stay under 10 requests a second\n5. Verify a domain before sending to anyone but your own address\n\n## Questions\n\n### Which is better for AI agents, MailerSend or Resend API + MCP?\n\nResend API + MCP scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 5 of 7 scored categories. MailerSend leads on reliability.\n\n### Do MailerSend and Resend API + MCP need an API key?\n\nBoth take an API key or an OAuth sign-in.\n\n### Can an agent call MailerSend and Resend API + MCP without installing anything?\n\nYes. MailerSend has a hosted endpoint at https://api.mailersend.com/v1 and Resend API + MCP at https://api.resend.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/mailersend-vs-resend.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mailersend-vs-resend.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"mailersend\", \"b\": \"resend\"}`. From a terminal: `anchor compare mailersend resend`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mailersend.json and https://www.anchorterminal.com/api/v1/tools/resend.json\n\n## Other comparisons with MailerSend or Resend API + MCP\n\n- [Amazon SES vs MailerSend](https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.md)\n- [Amazon SES vs Resend API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-resend.md)\n- [Brevo API + MCP vs MailerSend](https://www.anchorterminal.com/compare/brevo-vs-mailersend.md)\n- [Brevo API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/brevo-vs-resend.md)\n- [Loops API + MCP vs MailerSend](https://www.anchorterminal.com/compare/loops-vs-mailersend.md)\n- [Loops API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/loops-vs-resend.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 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 Resend API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-resend.md)\n- [Mailjet API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-resend.md)\n- [Mailtrap Email API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-resend.md)\n- [Postmark API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/postmark-vs-resend.md)\n- [Resend API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/resend-vs-sendgrid.md)\n- [Resend API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/resend-vs-smtp2go.md)\n- [Resend API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/resend-vs-zoho-zeptomail.md)\n",
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    "description": "Resend API + MCP scores 75.1 (BB) on agent readiness against MailerSend's 69.5 (B), and leads in 5 of 7 scored categories. MailerSend leads on reliability. Both do email send. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "MailerSend vs Resend API + MCP for AI agents, B 69.5 vs BB 75.1",
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