{
  "data": {
    "a": {
      "slug": "mandrill",
      "name": "Mailchimp Transactional (Mandrill)",
      "vendor": "Intuit Mailchimp",
      "vendorUrl": "https://mailchimp.com/features/transactional-email/",
      "kind": "http-api",
      "category": "email",
      "summary": "Transactional email service from Intuit Mailchimp, formerly Mandrill. It sends application email and SMS through an HTTP API, SMTP or a hosted MCP server, with templates, inbound routing, webhooks and reporting, as a paid add-on to a Mailchimp plan.",
      "url": "https://www.anchorterminal.com/tools/mandrill",
      "markdownUrl": "https://www.anchorterminal.com/tools/mandrill.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mandrill.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mandrill.json",
      "repo": "https://github.com/mailchimp/mailchimp-client-lib-codegen",
      "license": "Proprietary service under Mailchimp's Standard Terms of Use and Additional Terms. The client libraries are under Mailchimp's own client library licence agreement",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://mandrillapp.com/api/1.4",
      "packages": [
        {
          "registry": "npm",
          "name": "@mailchimp/mailchimp_transactional"
        },
        {
          "registry": "pypi",
          "name": "mailchimp-transactional"
        }
      ],
      "auth": "api-key",
      "authNotes": "Self-serve API key, created in the Transactional web app at mandrillapp.com/settings by an Owner or Admin of the Mailchimp account. The key goes in the JSON body of every POST as `key`, and the MCP server takes it as `Authorization: Bearer`. A key can be limited to chosen endpoints and to IP addresses, and a restricted key needs the AI Agents permission group to use the MCP server. Test keys work only in test mode. There is no OAuth for this API.",
      "pricing": "paid",
      "pricingNotes": "$20 per block of 25,000 emails a month for 1 to 20 blocks, falling in steps to $10 at 161 blocks or more, on top of a Standard or Premium Mailchimp marketing plan. Blocks are billed monthly in advance and unused emails do not roll over. A dedicated IP is $29.95 a month. An agent's owner can start without a contract through the demo, which gives 500 emails once to the account's own verified domain on any Mailchimp account, free plan included. Test keys send nothing and cost nothing (https://mailchimp.com/pricing/transactional-email/).",
      "priceSummary": "$29.95 / 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": 9,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 226039,
        "pypiWeekly": 132016,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://mailchimp.com/developer/transactional/docs/fundamentals/",
      "llmsTxt": "https://mailchimp.com/developer/transactional/llms.txt",
      "openapi": "https://mailchimp.com/developer/openapi/api-reference-2.json",
      "capabilities": [
        "email.send",
        "email.templates",
        "email.inbound",
        "email.domains",
        "email.analytics"
      ],
      "tags": [
        "hosted",
        "paid",
        "mcp",
        "openapi",
        "llms-txt",
        "api-key",
        "smtp",
        "webhooks",
        "inbound",
        "sandbox",
        "typescript",
        "python",
        "status-page",
        "soc2"
      ],
      "lastRelease": "2026-03-24",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 58.1,
        "grade": "C",
        "agentReady": false,
        "rank": 459,
        "ranked": true,
        "rankOf": 722,
        "categoryRank": 12,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 60,
          "maintenance": 28,
          "payments": 35,
          "reliability": 53,
          "schema": 79,
          "security": 68,
          "transparency": 71
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": 0,
        "verdict": "A public OpenAPI 3.1 file covers all 99 operations, the docs serve Markdown and llms.txt, and keys can be limited by endpoint and IP address. Sending needs a Standard or Premium Mailchimp plan plus $20 blocks of 25,000 emails. No send idempotency key or SLA was found, and the newest dated release is from 24 March 2026.",
        "bestFor": "Teams already paying for Mailchimp Standard or Premium that want transactional mail, inbound parsing and an MCP server on the same account.",
        "strengths": [
          "OpenAPI 3.1 file for all 99 operations, with typed error bodies for 401, 402, 404, 422, 429 and 500",
          "Hosted MCP server at `https://mandrillapp.com/mcp` with 9 tools, three of which list, describe and call API endpoints",
          "API keys can be limited to named endpoints and to IP addresses, and test keys send nothing",
          "Every docs page has a Markdown copy at the same URL plus `.md`, with an llms.txt index",
          "Status page lists Mailchimp Transactional as its own component with month-by-month event history"
        ],
        "weaknesses": [
          "Full use needs a Standard or Premium Mailchimp marketing plan in addition to the email blocks",
          "No idempotency key on `/messages/send`, and no `Retry-After` header found in the docs or the specification",
          "Three delivery-delay incidents in September 2026, two of them lasting more than four hours",
          "The newest client library and specification release is 24 March 2026, and the changelog's newest entry is 19 August 2025",
          "The docs give three API version paths (1.0, 1.3 and 1.4), and the llms.txt link to the OpenAPI file returns 404"
        ],
        "agentNotes": [
          "Send every call as POST with the key in the JSON body as `key`. The MCP server takes the same key as `Authorization: Bearer`",
          "Use a test API key while building. Test sends are free, capped at 10,000 a day, and deliver nothing",
          "Verify the sending domain with DKIM and DMARC first. Mail from an unverified domain is rejected with the reason `unsigned`",
          "Keep `/messages/search` under 20 calls a minute and set `limit` (default 100, maximum 1,000). There is no offset, so use an activity export for more",
          "For a restricted key that must also use the MCP server, enable the AI Agents permission group on the key"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 58.1
          }
        ],
        "editorialScores": {
          "ergonomics": 60,
          "maintenance": 28,
          "payments": 35,
          "reliability": 53,
          "schema": 79,
          "security": 68,
          "transparency": 64
        },
        "provenanceScore": 77
      },
      "connect": {
        "install": "npm install @mailchimp/mailchimp_transactional",
        "http": "curl -sS -X POST \"https://mandrillapp.com/api/1.0/users/ping\" \\\n  --header 'Content-Type: application/json' \\\n  --data-raw '{ \"key\": \"YOUR_API_KEY\" }'",
        "claudeCode": "claude mcp add --transport http mctx-mcp https://mandrillapp.com/mcp \\\n  -H \"Authorization: Bearer YOUR_API_KEY\"",
        "config": {
          "mcpServers": {
            "mctx-mcp": {
              "headers": {
                "Authorization": "Bearer YOUR_API_KEY"
              },
              "type": "http",
              "url": "https://mandrillapp.com/mcp"
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/mandrill"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Email block, 1 to 20 blocks",
          "unit": "1k-emails",
          "usd": 0.8,
          "note": "$20 per block of 25,000 emails, billed monthly, unused emails do not roll over. Needs a Standard or Premium Mailchimp plan"
        },
        {
          "item": "Email block, 21 to 40 blocks",
          "unit": "1k-emails",
          "usd": 0.72,
          "note": "$18 per block of 25,000"
        },
        {
          "item": "Email block, 41 to 80 blocks",
          "unit": "1k-emails",
          "usd": 0.64,
          "note": "$16 per block of 25,000"
        },
        {
          "item": "Email block, 81 to 120 blocks",
          "unit": "1k-emails",
          "usd": 0.56,
          "note": "$14 per block of 25,000"
        },
        {
          "item": "Email block, 121 to 160 blocks",
          "unit": "1k-emails",
          "usd": 0.48,
          "note": "$12 per block of 25,000"
        },
        {
          "item": "Email block, 161 blocks or more",
          "unit": "1k-emails",
          "usd": 0.4,
          "note": "$10 per block of 25,000"
        },
        {
          "item": "Dedicated IP",
          "unit": "month",
          "usd": 29.95
        }
      ],
      "provenance": {
        "legalEntity": "The Rocket Science Group LLC d/b/a Mailchimp",
        "domain": "mailchimp.com",
        "domainRegistered": "2001-06-29",
        "endpointOnVendorDomain": false,
        "terms": "https://mailchimp.com/legal/terms/",
        "privacy": "https://www.intuit.com/privacy/statement/",
        "statusPage": "https://status.mailchimp.com",
        "changelog": "https://mailchimp.com/developer/release-notes/",
        "securityTxt": "valid",
        "checked": "2026-10-08",
        "notes": [
          "The Standard Terms of Use, updated and effective 10 October 2025, name The Rocket Science Group LLC d/b/a Mailchimp, 405 N Angier Ave. NE, Atlanta, Georgia, part of the Intuit group with Intuit Inc. as parent.",
          "Transactional Email is also governed by the section For Transactional Email (formerly Mandrill) of the Additional Terms at https://mailchimp.com/legal/additional-terms/, which the Standard Terms incorporate, and by the API Use Policy updated 1 August 2023.",
          "The privacy field points at the Intuit Global Privacy Statement, last updated 9 March 2026. Mailchimp's terms name it as the privacy document for the service, mailchimp.com/legal/privacy redirects to it, and it names The Rocket Science Group LLC d/b/a Mailchimp. Mailchimp publishes no separate privacy policy.",
          "The API and the MCP server are served from mandrillapp.com, registered 2011-09-01, not from mailchimp.com (RDAP, Verisign).",
          "mailchimp.com/.well-known/security.txt holds one Contact line that points at the responsible disclosure section of the security page, with no Expires field. mandrillapp.com has no security.txt (404).",
          "The changelog covers the Marketing and Transactional APIs together. Its newest entry is dated 19 August 2025."
        ],
        "score": 77
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/mandrill.json",
      "live": {
        "slug": "mandrill",
        "probe": {
          "target": "https://mandrillapp.com/api/1.4",
          "method": "get",
          "lastAt": "2026-10-08T21:12:14.861311294Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 421,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 426,
          "p95ms24h": 456,
          "samples24h": 21,
          "samples30d": 21,
          "days": [
            {
              "date": "2026-10-08",
              "probes": 21,
              "ok": 21
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.mailchimp.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-08T19:38:46.313674676Z"
        },
        "updatedAt": "2026-10-08T21:12:14.861311294Z"
      }
    },
    "answer": "Resend API + MCP scores 75.1 (BB) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories.",
    "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": 722,
        "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": "2026-10-08T21:12:20.111011864Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 125,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 133,
          "p95ms24h": 212,
          "samples24h": 271,
          "samples30d": 2157,
          "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": 239,
              "ok": 239
            }
          ]
        },
        "vendorStatus": {
          "page": "https://resend-status.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-08T21:06:23.943894089Z"
        },
        "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": "2026-10-08T21:12:20.111011864Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Intuit Mailchimp",
        "b": "Resend",
        "name": "Vendor"
      },
      {
        "a": "https://mandrillapp.com/api/1.4",
        "b": "https://api.resend.com",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP",
        "b": "HTTP, Streamable HTTP, stdio",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "OAuth or key",
        "name": "Auth"
      },
      {
        "a": "Paid",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Proprietary service under Mailchimp's Standard Terms of Use and Additional Terms. The client libraries are under Mailchimp's own client library licence agreement",
        "b": "MIT",
        "name": "Licence"
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      {
        "a": "9",
        "b": "106",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-03-24",
        "b": "2026-09-29",
        "name": "Last release"
      },
      {
        "a": "no date given",
        "b": "no date given",
        "name": "Terms last updated"
      },
      {
        "a": "2026-03-09",
        "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": "226k npm/wk, 132k 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 Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories.",
        "question": "Which is better for AI agents, Mailchimp Transactional (Mandrill) or Resend API + MCP?"
      },
      {
        "answer": "Mailchimp Transactional (Mandrill) needs an API key. Resend API + MCP takes an API key or an OAuth sign-in.",
        "question": "Do Mailchimp Transactional (Mandrill) and Resend API + MCP need an API key?"
      },
      {
        "answer": "Yes. Mailchimp Transactional (Mandrill) has a hosted endpoint at https://mandrillapp.com/api/1.4 and Resend API + MCP at https://api.resend.com.",
        "question": "Can an agent call Mailchimp Transactional (Mandrill) and Resend API + MCP without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": null,
        "also": null,
        "goodFor": "Teams already paying for Mailchimp Standard or Premium that want transactional mail, inbound parsing and an MCP server on the same account.",
        "slug": "mandrill",
        "watchFor": "Full use needs a Standard or Premium Mailchimp marketing plan in addition to the email blocks"
      },
      {
        "aheadOn": [
          "Reliability, 85 against 53",
          "Schema \u0026 documentation, 95 against 79",
          "Agent ergonomics, 67 against 60",
          "Payments \u0026 pricing, 40 against 35",
          "Maintenance \u0026 community, 93 against 28",
          "Transparency \u0026 trust, 83 against 71"
        ],
        "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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      },
      {
        "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-resend.json",
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      {
        "json": "https://www.anchorterminal.com/compare/brevo-vs-mandrill.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/brevo-vs-resend.json",
        "title": "Brevo API + MCP vs Resend API + MCP",
        "url": "https://www.anchorterminal.com/compare/brevo-vs-resend"
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      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mandrill.json",
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      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-resend.json",
        "title": "Cloudflare Email Service vs Resend API + MCP",
        "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-resend"
      },
      {
        "json": "https://www.anchorterminal.com/compare/loops-vs-mandrill.json",
        "title": "Loops API + MCP vs Mailchimp Transactional (Mandrill)",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/loops-vs-resend.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/mailersend-vs-mandrill.json",
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        "url": "https://www.anchorterminal.com/compare/mailersend-vs-mandrill"
      },
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        "json": "https://www.anchorterminal.com/compare/mailersend-vs-resend.json",
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        "url": "https://www.anchorterminal.com/compare/mailersend-vs-resend"
      },
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        "json": "https://www.anchorterminal.com/compare/mailgun-vs-mandrill.json",
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        "json": "https://www.anchorterminal.com/compare/mailgun-vs-resend.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/mailjet-vs-mandrill.json",
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        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-mandrill.json",
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        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-resend.json",
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        "url": "https://www.anchorterminal.com/compare/mailtrap-vs-resend"
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        "json": "https://www.anchorterminal.com/compare/mandrill-vs-postmark.json",
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        "url": "https://www.anchorterminal.com/compare/mandrill-vs-postmark"
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        "json": "https://www.anchorterminal.com/compare/mandrill-vs-sendgrid.json",
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        "url": "https://www.anchorterminal.com/compare/mandrill-vs-sendgrid"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mandrill-vs-smtp2go.json",
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        "url": "https://www.anchorterminal.com/compare/mandrill-vs-smtp2go"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mandrill-vs-zoho-zeptomail.json",
        "title": "Mailchimp Transactional (Mandrill) vs Zoho CPaaS (formerly ZeptoMail)",
        "url": "https://www.anchorterminal.com/compare/mandrill-vs-zoho-zeptomail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/postmark-vs-resend.json",
        "title": "Postmark API + MCP vs Resend API + MCP",
        "url": "https://www.anchorterminal.com/compare/postmark-vs-resend"
      },
      {
        "json": "https://www.anchorterminal.com/compare/resend-vs-sendgrid.json",
        "title": "Resend API + MCP vs Twilio SendGrid",
        "url": "https://www.anchorterminal.com/compare/resend-vs-sendgrid"
      },
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        "json": "https://www.anchorterminal.com/compare/resend-vs-smtp2go.json",
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    ],
    "scores": [
      {
        "by": 32,
        "edge": "resend",
        "key": "reliability",
        "mandrill": 53,
        "name": "Reliability",
        "resend": 85,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 16,
        "edge": "resend",
        "key": "schema",
        "mandrill": 79,
        "name": "Schema \u0026 documentation",
        "resend": 95,
        "weight": 13
      },
      {
        "by": 7,
        "edge": "resend",
        "key": "ergonomics",
        "mandrill": 60,
        "name": "Agent ergonomics",
        "resend": 67,
        "weight": 13
      },
      {
        "by": 3,
        "edge": "mandrill",
        "key": "security",
        "mandrill": 68,
        "name": "Security \u0026 auth",
        "resend": 65,
        "weight": 14
      },
      {
        "by": 5,
        "edge": "resend",
        "key": "payments",
        "mandrill": 35,
        "name": "Payments \u0026 pricing",
        "resend": 40,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 65,
        "edge": "resend",
        "key": "maintenance",
        "mandrill": 28,
        "name": "Maintenance \u0026 community",
        "resend": 93,
        "weight": 7
      },
      {
        "by": 12,
        "edge": "resend",
        "key": "transparency",
        "mandrill": 71,
        "name": "Transparency \u0026 trust",
        "resend": 83,
        "weight": 7
      }
    ],
    "summary": "Resend API + MCP scores 75.1 (BB) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Both do email send.",
    "verdicts": {
      "mandrill": "A public OpenAPI 3.1 file covers all 99 operations, the docs serve Markdown and llms.txt, and keys can be limited by endpoint and IP address. Sending needs a Standard or Premium Mailchimp plan plus $20 blocks of 25,000 emails. No send idempotency key or SLA was found, and the newest dated release is from 24 March 2026.",
      "resend": "`Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours. 106 MCP tools load at once, with no toolsets."
    }
  },
  "kind": "anchor.page",
  "links": {
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  "markdown": "Resend API + MCP scores 75.1 (BB) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Both do email send.\n\n- Mailchimp Transactional (Mandrill): grade C, 58.1/100, rank #459 of 722. Markdown https://www.anchorterminal.com/tools/mandrill.md · JSON https://www.anchorterminal.com/api/v1/tools/mandrill.json\n- Resend API + MCP: grade BB, 75.1/100, rank #50 of 722. 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### Mailchimp Transactional (Mandrill) (C)\n\nGood for: Teams already paying for Mailchimp Standard or Premium that want transactional mail, inbound parsing and an MCP server on the same account.\n\nWatch for: Full use needs a Standard or Premium Mailchimp marketing plan in addition to the email blocks\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- Reliability, 85 against 53\n- Schema \u0026 documentation, 95 against 79\n- Agent ergonomics, 67 against 60\n- Payments \u0026 pricing, 40 against 35\n- Maintenance \u0026 community, 93 against 28\n- Transparency \u0026 trust, 83 against 71\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 | Mailchimp Transactional (Mandrill) | Resend API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 53 | 85 | Resend API + MCP +32 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 79 | 95 | Resend API + MCP +16 |\n| Agent ergonomics | 13% (16.2 this run) | 60 | 67 | Resend API + MCP +7 |\n| Security \u0026 auth | 14% (17.5 this run) | 68 | 65 | Mailchimp Transactional (Mandrill) +3 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 40 | Resend API + MCP +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 28 | 93 | Resend API + MCP +65 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 71 | 83 | Resend API + MCP +12 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **58.1 · C** | **75.1 · BB** | |\n\n## Facts side by side\n\n| Fact | Mailchimp Transactional (Mandrill) | Resend API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Intuit Mailchimp | Resend |\n| Hosted endpoint | `https://mandrillapp.com/api/1.4` | `https://api.resend.com` |\n| Transports | HTTP | HTTP, Streamable HTTP, stdio |\n| Auth | API key | OAuth or key |\n| Pricing | Paid | Freemium |\n| x402 | no | no |\n| Licence | Proprietary service under Mailchimp's Standard Terms of Use and Additional Terms. The client libraries are under Mailchimp's own client library licence agreement | MIT |\n| Tools exposed | 9 | 106 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-03-24 | 2026-09-29 |\n| Terms last updated | no date given | no date given |\n| Privacy policy last updated | 2026-03-09 | 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 | 226k npm/wk, 132k 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**Mailchimp Transactional (Mandrill).** A public OpenAPI 3.1 file covers all 99 operations, the docs serve Markdown and llms.txt, and keys can be limited by endpoint and IP address. Sending needs a Standard or Premium Mailchimp plan plus $20 blocks of 25,000 emails. No send idempotency key or SLA was found, and the newest dated release is from 24 March 2026.\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### Mailchimp Transactional (Mandrill)\n\n1. Send every call as POST with the key in the JSON body as `key`. The MCP server takes the same key as `Authorization: Bearer`\n2. Use a test API key while building. Test sends are free, capped at 10,000 a day, and deliver nothing\n3. Verify the sending domain with DKIM and DMARC first. Mail from an unverified domain is rejected with the reason `unsigned`\n4. Keep `/messages/search` under 20 calls a minute and set `limit` (default 100, maximum 1,000). There is no offset, so use an activity export for more\n5. For a restricted key that must also use the MCP server, enable the AI Agents permission group on the key\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, Mailchimp Transactional (Mandrill) or Resend API + MCP?\n\nResend API + MCP scores 75.1 (BB) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories.\n\n### Do Mailchimp Transactional (Mandrill) and Resend API + MCP need an API key?\n\nMailchimp Transactional (Mandrill) needs an API key. Resend API + MCP takes an API key or an OAuth sign-in.\n\n### Can an agent call Mailchimp Transactional (Mandrill) and Resend API + MCP without installing anything?\n\nYes. Mailchimp Transactional (Mandrill) has a hosted endpoint at https://mandrillapp.com/api/1.4 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/mandrill-vs-resend.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mandrill-vs-resend.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"mandrill\", \"b\": \"resend\"}`. From a terminal: `anchor compare mandrill resend`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mandrill.json and https://www.anchorterminal.com/api/v1/tools/resend.json\n\n## Other comparisons with Mailchimp Transactional (Mandrill) or Resend API + MCP\n\n- [Amazon SES vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/amazon-ses-vs-mandrill.md)\n- [Amazon SES vs Resend API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-resend.md)\n- [Brevo API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/brevo-vs-mandrill.md)\n- [Brevo API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/brevo-vs-resend.md)\n- [Cloudflare Email Service vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mandrill.md)\n- [Cloudflare Email Service vs Resend API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-resend.md)\n- [Loops API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/loops-vs-mandrill.md)\n- [Loops API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/loops-vs-resend.md)\n- [MailerSend vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailersend-vs-mandrill.md)\n- [MailerSend vs Resend API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-resend.md)\n- [Mailgun API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailgun-vs-mandrill.md)\n- [Mailgun API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-resend.md)\n- [Mailjet API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailjet-vs-mandrill.md)\n- [Mailjet API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-resend.md)\n- [Mailtrap Email API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailtrap-vs-mandrill.md)\n- [Mailtrap Email API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-resend.md)\n- [Mailchimp Transactional (Mandrill) vs Postmark API + MCP](https://www.anchorterminal.com/compare/mandrill-vs-postmark.md)\n- [Mailchimp Transactional (Mandrill) vs Twilio SendGrid](https://www.anchorterminal.com/compare/mandrill-vs-sendgrid.md)\n- [Mailchimp Transactional (Mandrill) vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mandrill-vs-smtp2go.md)\n- [Mailchimp Transactional (Mandrill) vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mandrill-vs-zoho-zeptomail.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",
  "meta": {
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