{
  "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": "2026-10-09T01:12:50.763736472Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 427,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 423,
          "p95ms24h": 447,
          "samples24h": 63,
          "samples30d": 63,
          "days": [
            {
              "date": "2026-10-08",
              "probes": 50,
              "ok": 50
            },
            {
              "date": "2026-10-09",
              "probes": 13,
              "ok": 13
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.mailchimp.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-08T19:38:46.313674676Z"
        },
        "updatedAt": "2026-10-09T01:12:50.763736472Z"
      }
    },
    "answer": "Postmark API + MCP scores 66.5 (B) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Mailchimp Transactional (Mandrill) leads on security \u0026 auth.",
    "b": {
      "slug": "postmark",
      "name": "Postmark API + MCP",
      "vendor": "Postmark (ActiveCampaign)",
      "vendorUrl": "https://postmarkapp.com",
      "kind": "http-api",
      "category": "email",
      "summary": "Transactional email API with separate broadcast streams, templates, inbound parsing and bounce handling.",
      "url": "https://www.anchorterminal.com/tools/postmark",
      "markdownUrl": "https://www.anchorterminal.com/tools/postmark.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/postmark.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/postmark.json",
      "repo": "https://github.com/ActiveCampaign/postmark-mcp",
      "license": "MIT",
      "transports": [
        "http",
        "stdio"
      ],
      "remoteUrl": "https://api.postmarkapp.com",
      "packages": [
        {
          "registry": "npm",
          "name": "postmark"
        },
        {
          "registry": "npm",
          "name": "@activecampaign/postmark-mcp"
        }
      ],
      "auth": "api-key",
      "authNotes": "Server API token in the `X-Postmark-Server-Token` header for sending and per-server calls, and a separate `X-Postmark-Account-Token` for account-level calls. The token `POSTMARK_API_TEST` accepts requests without sending. The MCP server reads the server token from `POSTMARK_SERVER_TOKEN`.",
      "pricing": "freemium",
      "pricingNotes": "Free Developer plan with 100 emails a month, no overages and no expiry. At 10,000 emails a month Basic is $15, Pro $16.50 and Platform $18, with overage $1.80, $1.30 and $1.20 per 1,000. Pro at 125,000 is $126.50 and at 1,500,000 is $852.50. Sent and received emails both count. Dedicated IPs $50 a month from 300,000 emails a month, DMARC monitoring $14 a month per domain (https://postmarkapp.com/pricing).",
      "priceSummary": "$15 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 24,
      "popularity": {
        "githubStars": 57,
        "npmWeekly": 1281479,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://postmarkapp.com/developer",
      "llmsTxt": "https://postmarkapp.com/llms.txt",
      "capabilities": [
        "email.send",
        "email.inbound",
        "email.templates",
        "email.domains",
        "email.analytics",
        "email.marketing"
      ],
      "tags": [
        "hosted",
        "freemium",
        "no-card",
        "mcp",
        "llms-txt",
        "typescript",
        "webhooks"
      ],
      "lastRelease": "2026-08-12",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 66.5,
        "grade": "B",
        "agentReady": false,
        "rank": 235,
        "ranked": true,
        "rankOf": 722,
        "categoryRank": 6,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 79,
          "maintenance": 65,
          "payments": 40,
          "reliability": 60,
          "schema": 81,
          "security": 63,
          "transparency": 77
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives. No OpenAPI spec and no published request-rate limit.",
        "bestFor": "Transactional mail where deliverability and a small, well-annotated MCP matter more than a free tier.",
        "strengths": [
          "24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives",
          "Prompt-injection guidance and a webhook URL allowlist in the MCP README",
          "45-day retention by default, two named subprocessors and a DPA in the terms",
          "Per-1,000 overage rates published for every plan",
          "IP allowlisting for API sending since 27 August 2026"
        ],
        "weaknesses": [
          "No OpenAPI spec and no published request-rate limit",
          "Manual account approval before sending outside your own domains",
          "No SOC 2, ISO 27001, disclosure policy or security.txt found for Postmark itself",
          "Webhooks aren't HMAC-signed",
          "The MCP server runs locally only and its repository has no CI"
        ],
        "agentNotes": [
          "Install @activecampaign/postmark-mcp, never the unscoped postmark-mcp package",
          "Use the token `POSTMARK_API_TEST` to check a payload without sending",
          "Set `MessageStream` to `outbound` for transactional mail and a broadcast stream for bulk",
          "Set `WEBHOOK_URL_ALLOWLIST` so a misled createWebhook call can't send events to someone else's server",
          "Keep `count + offset` under 10,000 on message and bounce searches"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 66.5
          }
        ],
        "editorialScores": {
          "ergonomics": 79,
          "maintenance": 65,
          "payments": 40,
          "reliability": 60,
          "schema": 81,
          "security": 63,
          "transparency": 69
        },
        "provenanceScore": 85
      },
      "connect": {
        "http": "curl https://api.postmarkapp.com/email -H \"Accept: application/json\" \\\n  -H \"Content-Type: application/json\" -H \"X-Postmark-Server-Token: $POSTMARK_SERVER_TOKEN\" \\\n  -d '{\"From\":\"sender@example.com\",\"To\":\"receiver@example.com\",\"Subject\":\"Hello\",\"TextBody\":\"Hello\",\"MessageStream\":\"outbound\"}'",
        "config": {
          "mcpServers": {
            "postmark": {
              "args": [
                "-y",
                "@activecampaign/postmark-mcp"
              ],
              "command": "npx",
              "env": {
                "DEFAULT_MESSAGE_STREAM": "outbound",
                "DEFAULT_SENDER_EMAIL": "${DEFAULT_SENDER_EMAIL}",
                "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/postmark"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Basic 10k",
          "unit": "month",
          "usd": 15,
          "note": "10,000 emails"
        },
        {
          "item": "Pro 10k",
          "unit": "month",
          "usd": 16.5,
          "note": "10,000 emails"
        },
        {
          "item": "Platform 10k",
          "unit": "month",
          "usd": 18,
          "note": "10,000 emails"
        },
        {
          "item": "Pro 125k",
          "unit": "month",
          "usd": 126.5,
          "note": "125,000 emails"
        },
        {
          "item": "Overage on Basic",
          "unit": "1k-emails",
          "usd": 1.8
        },
        {
          "item": "Overage on Pro",
          "unit": "1k-emails",
          "usd": 1.3
        },
        {
          "item": "Overage on Platform",
          "unit": "1k-emails",
          "usd": 1.2
        },
        {
          "item": "Dedicated IP",
          "unit": "month",
          "usd": 50,
          "note": "per IP, from 300,000 emails a month"
        }
      ],
      "provenance": {
        "legalEntity": "AC PM, LLC",
        "domain": "postmarkapp.com",
        "domainRegistered": "2009-05-25",
        "endpointOnVendorDomain": true,
        "terms": "https://postmarkapp.com/terms-of-service",
        "privacy": "https://www.activecampaign.com/legal/privacy-policy",
        "statusPage": "https://status.postmarkapp.com",
        "changelog": "https://postmarkapp.com/updates",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "AC PM, LLC is ActiveCampaign's Postmark entity. postmarkapp.com/privacy-policy redirects to ActiveCampaign's privacy policy."
        ],
        "score": 85
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/postmark.json",
      "live": {
        "slug": "postmark",
        "probe": {
          "target": "https://api.postmarkapp.com",
          "method": "get",
          "lastAt": "2026-10-09T01:12:54.769960513Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 553,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 99.64,
          "p50ms24h": 586,
          "p95ms24h": 680,
          "samples24h": 267,
          "samples30d": 2199,
          "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": 265
            },
            {
              "date": "2026-10-05",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-06",
              "probes": 272,
              "ok": 271
            },
            {
              "date": "2026-10-07",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-08",
              "probes": 268,
              "ok": 268
            },
            {
              "date": "2026-10-09",
              "probes": 13,
              "ok": 13
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.postmarkapp.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-08T19:39:04.74603919Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "ActiveCampaign/postmark-mcp",
            "version": "v2.1.1",
            "released": "2026-07-13",
            "seenAt": "2026-10-08T16:26:14.34528549Z"
          },
          {
            "registry": "npm",
            "name": "@activecampaign/postmark-mcp",
            "version": "2.1.1",
            "seenAt": "2026-10-08T16:26:13.064671382Z"
          },
          {
            "registry": "npm",
            "name": "postmark",
            "version": "5.1.0",
            "seenAt": "2026-10-08T16:26:12.116674057Z"
          }
        ],
        "githubStars": 57,
        "npmWeekly": 1396221,
        "securityTxt": {
          "url": "https://postmarkapp.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-08T15:39:01.582221748Z"
        },
        "llmsTxt": {
          "url": "https://postmarkapp.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-08T14:00:47.172289518Z"
        },
        "domain": {
          "domain": "postmarkapp.com",
          "registered": "2009-05-25",
          "source": "https://rdap.verisign.com/com/v1/domain/postmarkapp.com",
          "checkedAt": "2026-10-04T13:05:40.955344563Z"
        },
        "pages": [
          {
            "url": "https://postmarkapp.com/updates",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-08T18:23:18.086154534Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "66f896f3e4fd"
          },
          {
            "url": "https://postmarkapp.com/pricing",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-08T18:23:13.944428468Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "7df8d73d2376"
          },
          {
            "url": "https://www.activecampaign.com/legal/privacy-policy",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-07T18:10:31.997529995Z",
            "changedAt": "2026-10-02T15:25:06.170575042Z",
            "fingerprint": "3ba14f859de2"
          },
          {
            "url": "https://postmarkapp.com/terms-of-service",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-08T18:23:16.207518846Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "92e20985dde5"
          }
        ],
        "updatedAt": "2026-10-09T01:12:54.769960513Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Intuit Mailchimp",
        "b": "Postmark (ActiveCampaign)",
        "name": "Vendor"
      },
      {
        "a": "https://mandrillapp.com/api/1.4",
        "b": "https://api.postmarkapp.com",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP",
        "b": "HTTP, stdio",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "API 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",
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      {
        "a": "9",
        "b": "24",
        "name": "Tools exposed"
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      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
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      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
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        "a": "2026-03-24",
        "b": "2026-08-12",
        "name": "Last release"
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        "a": "no date given",
        "b": "2024-12-10",
        "name": "Terms last updated"
      },
      {
        "a": "2026-03-09",
        "b": "2026-10-01",
        "name": "Privacy policy last updated"
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      {
        "a": "yes",
        "b": "yes",
        "name": "Customer content may train models"
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      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Terms restrict automated access"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "yes",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "226k npm/wk, 132k PyPI/wk",
        "b": "57 stars, 1.3M npm/wk",
        "name": "Popularity"
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      {
        "a": "none",
        "b": "3/5 (2)",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Postmark API + MCP scores 66.5 (B) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Mailchimp Transactional (Mandrill) leads on security \u0026 auth.",
        "question": "Which is better for AI agents, Mailchimp Transactional (Mandrill) or Postmark API + MCP?"
      },
      {
        "answer": "Both need an API key.",
        "question": "Do Mailchimp Transactional (Mandrill) and Postmark API + MCP need an API key?"
      },
      {
        "answer": "Yes. Mailchimp Transactional (Mandrill) has a hosted endpoint at https://mandrillapp.com/api/1.4 and Postmark API + MCP at https://api.postmarkapp.com.",
        "question": "Can an agent call Mailchimp Transactional (Mandrill) and Postmark API + MCP without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Security \u0026 auth, 68 against 63"
        ],
        "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, 60 against 53",
          "Agent ergonomics, 79 against 60",
          "Payments \u0026 pricing, 40 against 35",
          "Maintenance \u0026 community, 65 against 28",
          "Transparency \u0026 trust, 77 against 71"
        ],
        "also": [
          "Runs on your own machine",
          "Free to start without a card"
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        "goodFor": "Transactional mail where deliverability and a small, well-annotated MCP matter more than a free tier.",
        "slug": "postmark",
        "watchFor": "No OpenAPI spec and no published request-rate limit"
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        "mandrill": 53,
        "name": "Reliability",
        "postmark": 60,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 2,
        "edge": "postmark",
        "key": "schema",
        "mandrill": 79,
        "name": "Schema \u0026 documentation",
        "postmark": 81,
        "weight": 13
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      {
        "by": 19,
        "edge": "postmark",
        "key": "ergonomics",
        "mandrill": 60,
        "name": "Agent ergonomics",
        "postmark": 79,
        "weight": 13
      },
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        "edge": "mandrill",
        "key": "security",
        "mandrill": 68,
        "name": "Security \u0026 auth",
        "postmark": 63,
        "weight": 14
      },
      {
        "by": 5,
        "edge": "postmark",
        "key": "payments",
        "mandrill": 35,
        "name": "Payments \u0026 pricing",
        "postmark": 40,
        "weight": 10
      },
      {
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        "name": "Task success",
        "pending": true,
        "weight": 10
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        "by": 37,
        "edge": "postmark",
        "key": "maintenance",
        "mandrill": 28,
        "name": "Maintenance \u0026 community",
        "postmark": 65,
        "weight": 7
      },
      {
        "by": 6,
        "edge": "postmark",
        "key": "transparency",
        "mandrill": 71,
        "name": "Transparency \u0026 trust",
        "postmark": 77,
        "weight": 7
      }
    ],
    "summary": "Postmark API + MCP scores 66.5 (B) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Mailchimp Transactional (Mandrill) leads on security \u0026 auth. 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.",
      "postmark": "24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives. No OpenAPI spec and no published request-rate limit."
    }
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  "markdown": "Postmark API + MCP scores 66.5 (B) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Mailchimp Transactional (Mandrill) leads on security \u0026 auth. 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- Postmark API + MCP: grade B, 66.5/100, rank #235 of 722. Markdown https://www.anchorterminal.com/tools/postmark.md · JSON https://www.anchorterminal.com/api/v1/tools/postmark.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\nAhead on:\n- Security \u0026 auth, 68 against 63\n\nWatch for: Full use needs a Standard or Premium Mailchimp marketing plan in addition to the email blocks\n\n### Postmark API + MCP (B)\n\nGood for: Transactional mail where deliverability and a small, well-annotated MCP matter more than a free tier.\n\nAhead on:\n- Reliability, 60 against 53\n- Agent ergonomics, 79 against 60\n- Payments \u0026 pricing, 40 against 35\n- Maintenance \u0026 community, 65 against 28\n- Transparency \u0026 trust, 77 against 71\n\nAlso in its favour:\n- Runs on your own machine\n- Free to start without a card\n\nWatch for: No OpenAPI spec and no published request-rate limit\n\n\n## Score by category\n\n| Category | Weight | Mailchimp Transactional (Mandrill) | Postmark API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 53 | 60 | Postmark API + MCP +7 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 79 | 81 | Postmark API + MCP +2 |\n| Agent ergonomics | 13% (16.2 this run) | 60 | 79 | Postmark API + MCP +19 |\n| Security \u0026 auth | 14% (17.5 this run) | 68 | 63 | Mailchimp Transactional (Mandrill) +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 40 | Postmark 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 | 65 | Postmark API + MCP +37 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 71 | 77 | Postmark API + MCP +6 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **58.1 · C** | **66.5 · B** | |\n\n## Facts side by side\n\n| Fact | Mailchimp Transactional (Mandrill) | Postmark API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Intuit Mailchimp | Postmark (ActiveCampaign) |\n| Hosted endpoint | `https://mandrillapp.com/api/1.4` | `https://api.postmarkapp.com` |\n| Transports | HTTP | HTTP, stdio |\n| Auth | API key | API 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 | 24 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-03-24 | 2026-08-12 |\n| Terms last updated | no date given | 2024-12-10 |\n| Privacy policy last updated | 2026-03-09 | 2026-10-01 |\n| Customer content may train models | yes | yes |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | yes | not found in the text |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 226k npm/wk, 132k PyPI/wk | 57 stars, 1.3M npm/wk |\n| Agent reviews | none | 3/5 (2) |\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**Postmark API + MCP.** 24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives. No OpenAPI spec and no published request-rate limit.\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### Postmark API + MCP\n\n1. Install @activecampaign/postmark-mcp, never the unscoped postmark-mcp package\n2. Use the token `POSTMARK_API_TEST` to check a payload without sending\n3. Set `MessageStream` to `outbound` for transactional mail and a broadcast stream for bulk\n4. Set `WEBHOOK_URL_ALLOWLIST` so a misled createWebhook call can't send events to someone else's server\n5. Keep `count + offset` under 10,000 on message and bounce searches\n\n## Questions\n\n### Which is better for AI agents, Mailchimp Transactional (Mandrill) or Postmark API + MCP?\n\nPostmark API + MCP scores 66.5 (B) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Mailchimp Transactional (Mandrill) leads on security \u0026 auth.\n\n### Do Mailchimp Transactional (Mandrill) and Postmark API + MCP need an API key?\n\nBoth need an API key.\n\n### Can an agent call Mailchimp Transactional (Mandrill) and Postmark API + MCP without installing anything?\n\nYes. Mailchimp Transactional (Mandrill) has a hosted endpoint at https://mandrillapp.com/api/1.4 and Postmark API + MCP at https://api.postmarkapp.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/mandrill-vs-postmark.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mandrill-vs-postmark.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"mandrill\", \"b\": \"postmark\"}`. From a terminal: `anchor compare mandrill postmark`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mandrill.json and https://www.anchorterminal.com/api/v1/tools/postmark.json\n\n## Other comparisons with Mailchimp Transactional (Mandrill) or Postmark API + MCP\n\n- [Amazon SES vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/amazon-ses-vs-mandrill.md)\n- [Amazon SES vs Postmark API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-postmark.md)\n- [Brevo API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/brevo-vs-mandrill.md)\n- [Brevo API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/brevo-vs-postmark.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 Postmark API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-postmark.md)\n- [Loops API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/loops-vs-mandrill.md)\n- [Loops API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/loops-vs-postmark.md)\n- [MailerSend vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailersend-vs-mandrill.md)\n- [MailerSend vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-postmark.md)\n- [Mailgun API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailgun-vs-mandrill.md)\n- [Mailgun API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-postmark.md)\n- [Mailjet API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailjet-vs-mandrill.md)\n- [Mailjet API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-postmark.md)\n- [Mailtrap Email API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailtrap-vs-mandrill.md)\n- [Mailtrap Email API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-postmark.md)\n- [Mailchimp Transactional (Mandrill) vs Resend API + MCP](https://www.anchorterminal.com/compare/mandrill-vs-resend.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- [Postmark API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/postmark-vs-sendgrid.md)\n- [Postmark API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/postmark-vs-smtp2go.md)\n- [Postmark API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/postmark-vs-zoho-zeptomail.md)\n",
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    "description": "Postmark API + MCP scores 66.5 (B) on agent readiness against Mailchimp Transactional (Mandrill)'s 58.1 (C), and leads in 6 of 7 scored categories. Mailchimp Transactional (Mandrill) leads on security \u0026 auth. Both do email send. Category scores, facts, verdicts and agent notes…",
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    "title": "Mailchimp Transactional (Mandrill) vs Postmark API + MCP for AI agents",
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