{
  "data": {
    "a": {
      "slug": "groundmail",
      "name": "Groundmail API + MCP",
      "vendor": "Groundmail",
      "vendorUrl": "https://groundmail.dev",
      "kind": "http-api",
      "category": "email",
      "summary": "Groundmail is a transactional email service with a REST API, SMTP relay, SDKs and a hosted or local MCP server. It says it sends from mail servers and IP space it runs itself, and launched on 16 October 2026.",
      "url": "https://www.anchorterminal.com/tools/groundmail",
      "markdownUrl": "https://www.anchorterminal.com/tools/groundmail.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/groundmail.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/groundmail.json",
      "repo": "https://github.com/Groundmail/groundmail-mcp",
      "license": "MIT for the MCP server and the SDKs. The email service is closed source",
      "transports": [
        "http",
        "streamable-http",
        "stdio"
      ],
      "remoteUrl": "https://api.groundmail.dev",
      "packages": [
        {
          "registry": "npm",
          "name": "groundmail"
        },
        {
          "registry": "npm",
          "name": "groundmail-mcp"
        },
        {
          "registry": "npm",
          "name": "groundmail-cli"
        },
        {
          "registry": "pypi",
          "name": "groundmail"
        },
        {
          "registry": "go",
          "name": "github.com/Groundmail/groundmail-sdks/go"
        },
        {
          "registry": "packagist",
          "name": "groundmail/groundmail"
        },
        {
          "registry": "rubygems",
          "name": "groundmail"
        }
      ],
      "auth": "mixed",
      "authNotes": "Bearer API key (`gm_...`) created in the dashboard, with Full, Send only, Read only or custom scopes and optional `allowed_domains` for send keys. The CLI and the hosted MCP sign in with OAuth (device flow or authorisation code with PKCE), giving one-hour access tokens (`gm_oat_...`) and rotating refresh tokens. The SMTP relay uses separate `gmsmtp_...` credentials.",
      "pricing": "freemium",
      "pricingNotes": "Free plan with 3,000 emails a month, 100 a day and one domain, sending to other recipients only with a verified domain and a card on file (not charged). Pro from $20 a month for 50,000 emails, overage $0.90 per 1,000. Scale from $90 for 100,000 to $1,150 for 2,500,000, overage down to $0.46 per 1,000. Dedicated server from $299 a month with 250,000 emails. Dedicated IPs $50 a month each on Scale. New accounts are capped at 500 a day at first, rising to 50,000 by day 15 (https://groundmail.dev/pricing/).",
      "priceSummary": "$20 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in llms-full.txt, the OpenAPI document or the pricing page (checked 2026-10-17). Billing is through Stripe.",
        "endpoints": []
      },
      "toolCount": 20,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-10-17"
      },
      "docsUrl": "https://docs.groundmail.dev",
      "llmsTxt": "https://docs.groundmail.dev/llms.txt",
      "openapi": "https://docs.groundmail.dev/openapi.yaml",
      "registryName": "io.github.Groundmail/groundmail",
      "capabilities": [
        "email.send",
        "email.domains",
        "email.templates",
        "email.inbound",
        "email.analytics"
      ],
      "tags": [
        "hosted",
        "freemium",
        "card-required",
        "mcp",
        "oauth",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "go",
        "php",
        "ruby",
        "webhooks",
        "cli",
        "agent-skills",
        "closed-source",
        "pre-1.0",
        "new"
      ],
      "lastRelease": "2026-10-17",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 57.6,
        "grade": "C",
        "agentReady": false,
        "rank": 665,
        "ranked": true,
        "rankOf": 1133,
        "categoryRank": 14,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 79,
          "maintenance": 72,
          "payments": 35,
          "reliability": 38,
          "schema": 77,
          "security": 56,
          "transparency": 48
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-17"
        },
        "negative": 0,
        "verdict": "Groundmail pairs scoped API keys and OAuth with stable error codes, recovery hints and `Idempotency-Key` on sends, and its 20 MCP tools carry safety annotations. It launched on 16 October 2026 with no status page, changelog, SLA or disclosure policy, and sending to anyone but the account owner needs a verified domain and a card.",
        "bestFor": "Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors.",
        "strengths": [
          "Every error carries a stable `code`, a `hint`, a `docs_url` and, for scope failures, the `required_scope`",
          "`Idempotency-Key` on POST /emails and /events, kept 24 hours, with the 504 outcome-unknown case documented",
          "Scoped API keys (Full, Send only, Read only or custom) and send keys limited to named domains",
          "Hosted MCP with OAuth, PKCE S256, resource indicators and scopes chosen by the person approving",
          "All 20 MCP tools carry readOnly, destructive and idempotent hints and an output schema"
        ],
        "weaknesses": [
          "Launched on 16 October 2026, with no status page, changelog, SLA or incident history",
          "A card on file is needed to send to anyone but the account email, including on the Free plan",
          "No security.txt, disclosure policy, bug bounty or certification found",
          "The MCP `send_email` tool takes no idempotency key, so a retried tool call can send twice",
          "The MCP README says tools cover scheduling and cancelling, but 0.6.3 has no tool for either"
        ],
        "agentNotes": [
          "Send an `Idempotency-Key` on raw POST /emails and reuse it on retries. On 504, check GET /emails before sending again",
          "Test from `noreply@mail.groundmail.dev` to the account email only. Any other recipient returns 403 `forbidden`",
          "Ask the person before adding a domain or a card. Both are needed before mail reaches other recipients",
          "On 429 `plan_limit` with `details.reason: \"warmup\"`, wait until `details.resets_at`. Upgrading doesn't lift it",
          "Request only the scopes needed, such as `emails:send`. An OAuth request with no scope gets `full`"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 4,
        "avgRating": 2.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 57.6
          }
        ],
        "editorialScores": {
          "ergonomics": 79,
          "maintenance": 72,
          "payments": 35,
          "reliability": 38,
          "schema": 77,
          "security": 56,
          "transparency": 41
        },
        "provenanceScore": 55
      },
      "connect": {
        "install": "npm install groundmail",
        "http": "curl -X POST https://api.groundmail.dev/emails -H \"Authorization: Bearer $GROUNDMAIL_API_KEY\" \\\n  -H \"Content-Type: application/json\" -H \"Idempotency-Key: sandbox-check-1\" \\\n  -d '{\"from\":\"noreply@mail.groundmail.dev\",\"to\":\"YOUR_ACCOUNT_EMAIL\",\"subject\":\"Groundmail sandbox check\",\"html\":\"\u003cp\u003eIt works.\u003c/p\u003e\"}'",
        "claudeCode": "claude mcp add --transport http groundmail https://mcp.groundmail.dev/mcp",
        "config": {
          "mcpServers": {
            "groundmail": {
              "args": [
                "-y",
                "groundmail-mcp"
              ],
              "command": "npx",
              "env": {
                "GROUNDMAIL_API_KEY": "${GROUNDMAIL_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/groundmail"
      },
      "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 server",
          "unit": "month",
          "usd": 299,
          "note": "250,000 emails included, $0.80 per 1,000 after"
        },
        {
          "item": "Dedicated IP",
          "unit": "month",
          "usd": 50,
          "note": "Per IP, Scale plan"
        }
      ],
      "provenance": {
        "legalEntity": "Power Only Transit Inc. dba Groundmail",
        "domain": "groundmail.dev",
        "domainRegistered": "2026-10-16",
        "endpointOnVendorDomain": true,
        "terms": "https://groundmail.dev/legal/terms/",
        "privacy": "https://groundmail.dev/legal/privacy/",
        "statusPage": "",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-10-17",
        "notes": [
          "The terms and privacy policy name Power Only Transit Inc. dba Groundmail, 2780 S. Jones Blvd #200-3432, Las Vegas, NV 89146, and Delaware law.",
          "RDAP gives groundmail.dev a registration time of 2026-10-16T03:15Z. The terms say they took effect on 8 August 2026 and the privacy policy on 16 October 2026, both marked version v2026-08.",
          "security.txt answered 404 on groundmail.dev and docs.groundmail.dev. status.groundmail.dev doesn't resolve, and groundmail.dev/status, docs.groundmail.dev/changelog and groundmail.dev/security/ answer 404.",
          "robots.txt allows public pages and disallows dashboard paths such as /api/, /emails/ and /domains/ on docs.groundmail.dev. Only allowed paths were read."
        ],
        "score": 55
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/groundmail.json",
      "live": {
        "slug": "groundmail",
        "probe": {
          "target": "https://api.groundmail.dev",
          "method": "get",
          "lastAt": "2026-10-18T00:14:41.979024896Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 648,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 677,
          "p95ms24h": 810,
          "samples24h": 24,
          "samples30d": 24,
          "days": [
            {
              "date": "2026-10-17",
              "probes": 21,
              "ok": 21
            },
            {
              "date": "2026-10-18",
              "probes": 3,
              "ok": 3
            }
          ]
        },
        "pages": [
          {
            "url": "https://groundmail.dev/pricing/",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-17T23:03:51.382426956Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "d31886163215"
          },
          {
            "url": "https://groundmail.dev/legal/privacy/",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-17T23:03:47.325144117Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b568fc16407f"
          },
          {
            "url": "https://groundmail.dev/legal/terms/",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-17T23:03:49.387195166Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b4c6edee2cc6"
          }
        ],
        "updatedAt": "2026-10-18T00:14:41.979024896Z"
      }
    },
    "answer": "Mailtrap Email API + MCP scores 66.8 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics.",
    "b": {
      "slug": "mailtrap",
      "name": "Mailtrap Email API + MCP",
      "vendor": "Mailtrap (Railsware)",
      "vendorUrl": "https://mailtrap.io",
      "kind": "http-api",
      "category": "email",
      "summary": "Email platform from Railsware Products Studio LLC for transactional and bulk sending, inbound mail, templates, contacts and sandbox testing. Agents reach it through a REST API, SMTP, SDKs, a CLI and a local MCP server.",
      "url": "https://www.anchorterminal.com/tools/mailtrap",
      "markdownUrl": "https://www.anchorterminal.com/tools/mailtrap.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mailtrap.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mailtrap.json",
      "repo": "https://github.com/mailtrap/mailtrap-mcp",
      "license": "Proprietary service under Mailtrap's terms of service. The MCP server, the Node.js SDK and the CLI are MIT",
      "transports": [
        "http",
        "stdio"
      ],
      "remoteUrl": "https://send.api.mailtrap.io",
      "packages": [
        {
          "registry": "npm",
          "name": "mailtrap"
        },
        {
          "registry": "npm",
          "name": "mcp-mailtrap"
        },
        {
          "registry": "pypi",
          "name": "mailtrap"
        }
      ],
      "auth": "api-key",
      "authNotes": "Self-serve API token, sent as `Authorization: Bearer` or in the `Api-Token` header. Tokens are created at mailtrap.io/settings/api-tokens with permissions per resource and an expiry of 1 to 365 days or a custom date (365 by default). A reset leaves the old token valid for 12 hours. The first token is made by hand in the UI, and later ones can be managed through the API. The MCP server reads `MAILTRAP_API_TOKEN`, and the sub-account tools need a separate organisation token.",
      "pricing": "freemium",
      "pricingNotes": "Free plan of 4,000 emails a month, capped at 150 a day, and the vendor says signup needs no credit card. Basic is $15 a month for 10,000 emails, Business starts at $85 for 100,000 and Enterprise at $750 for 1,500,000. Overage per 1,000 emails is $1.00, $0.88 and $0.55, and the free plan has none. Email Sandbox and Email Marketing are priced separately (https://mailtrap.io/pricing.md, checked 2026-10-08).",
      "priceSummary": "$15 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the docs index, the pricing reference, the OpenAPI specs or the MCP README (checked 2026-10-08).",
        "endpoints": []
      },
      "toolCount": 125,
      "popularity": {
        "githubStars": 65,
        "npmWeekly": 65939,
        "pypiWeekly": 21317,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://docs.mailtrap.io/",
      "llmsTxt": "https://docs.mailtrap.io/llms.txt",
      "openapi": "https://github.com/mailtrap/mailtrap-openapi",
      "registryName": "io.mailtrap/mcp",
      "capabilities": [
        "email.send",
        "email.inbound",
        "email.templates",
        "email.domains",
        "email.analytics",
        "email.marketing",
        "email.inbox",
        "email.threads"
      ],
      "tags": [
        "hosted",
        "freemium",
        "no-card",
        "mcp",
        "openapi",
        "llms-txt",
        "cli",
        "smtp",
        "typescript",
        "python",
        "webhooks",
        "sandbox",
        "status-page",
        "soc2",
        "iso27001"
      ],
      "lastRelease": "2026-10-08",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 66.8,
        "grade": "B",
        "agentReady": false,
        "rank": 297,
        "ranked": true,
        "rankOf": 1133,
        "categoryRank": 7,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 62,
          "maintenance": 93,
          "payments": 40,
          "reliability": 65,
          "schema": 82,
          "security": 60,
          "transparency": 77
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": 0,
        "verdict": "Public OpenAPI 3.1 specs, API tokens with per-resource permissions and expiry dates, and a free plan of 4,000 emails a month without a card support agent use. The MCP server loads 125 tools with no toolsets, no idempotency key was found for sends, and the status page records a sending outage of 1 hour 32 minutes on 1 August 2026.",
        "bestFor": "Teams that want sending, a test sandbox and inbound mail under one token, with public OpenAPI specs and a free plan.",
        "strengths": [
          "Ten public OpenAPI 3.1 specs in mailtrap/mailtrap-openapi, plus llms.txt, llms-full.txt and a Markdown copy of every docs page",
          "API tokens carry per-resource permissions and an expiry date (365 days by default), and a reset keeps the old token valid for 12 hours",
          "Free plan of 4,000 emails a month, with signup stated as needing no credit card, and overage rates published per 1,000 emails",
          "Every MCP tool is annotated, 53 with readOnlyHint and the other 72 with destructiveHint set true or false",
          "Email Sandbox captures test sends without delivering them, through the same API token and SDK switch"
        ],
        "weaknesses": [
          "The MCP server registers 125 tools at once, with no toolsets, filtering or read-only mode",
          "No idempotency key for sends was found in the OpenAPI specs or the docs",
          "The status page records a sending outage of 1 hour 32 minutes on 1 August 2026 covering the Email Sending API, SMTP and Inbound Email",
          "Inbound and sandbox message bodies reach the model through the MCP server, and no prompt-injection guidance was found in its README or the docs",
          "User audit logs are limited to the Enterprise plan, and the free plan keeps email logs for 3 days"
        ],
        "agentNotes": [
          "Ask the operator to create the first API token at mailtrap.io/settings/api-tokens. The first token can't be created through the API.",
          "Send transactional mail to send.api.mailtrap.io and bulk mail to bulk.api.mailtrap.io. Sandbox sending uses a different base URL and an inbox ID.",
          "Verify a sending domain before the first production send, and use Email Sandbox to test payloads without delivery.",
          "Stay under 150 requests per 10 seconds per token, and 10 per 60 seconds per account on the Stats and Suppressions APIs. On 429, back off until `x-ratelimit-reset`.",
          "Don't retry a timed-out send blindly, because no idempotency key was found. Check the email logs first."
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 4,
        "avgRating": 3.3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 66.8
          }
        ],
        "editorialScores": {
          "ergonomics": 62,
          "maintenance": 93,
          "payments": 40,
          "reliability": 65,
          "schema": 82,
          "security": 60,
          "transparency": 66
        },
        "provenanceScore": 87
      },
      "connect": {
        "install": "npm install mailtrap",
        "http": "curl -X POST https://send.api.mailtrap.io/api/send \\\n  -H 'Authorization: Bearer YOUR_API_KEY' \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n    \"from\": {\"email\": \"sender@example.com\"},\n    \"to\": [{\"email\": \"recipient@example.com\"}],\n    \"subject\": \"Hello from Mailtrap\",\n    \"text\": \"Welcome to Mailtrap!\"\n  }'",
        "config": {
          "mcpServers": {
            "mailtrap": {
              "args": [
                "-y",
                "mcp-mailtrap"
              ],
              "command": "npx",
              "env": {
                "DEFAULT_FROM_EMAIL": "your_sender@example.com",
                "MAILTRAP_ACCOUNT_ID": "your_account_id",
                "MAILTRAP_API_TOKEN": "your_mailtrap_api_token",
                "MAILTRAP_SANDBOX_ID": "your_sandbox_id"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/mailtrap"
      },
      "area": "communication",
      "unitPrices": [
        {
          "item": "Basic 10k",
          "unit": "month",
          "usd": 15,
          "note": "10,000 emails"
        },
        {
          "item": "Basic 100k",
          "unit": "month",
          "usd": 30,
          "note": "100,000 emails"
        },
        {
          "item": "Business 100k",
          "unit": "month",
          "usd": 85,
          "note": "100,000 emails"
        },
        {
          "item": "Enterprise 1.5M",
          "unit": "month",
          "usd": 750,
          "note": "1,500,000 emails"
        },
        {
          "item": "Overage on Basic",
          "unit": "1k-emails",
          "usd": 1
        },
        {
          "item": "Overage on Business",
          "unit": "1k-emails",
          "usd": 0.88
        },
        {
          "item": "Overage on Enterprise",
          "unit": "1k-emails",
          "usd": 0.55
        }
      ],
      "provenance": {
        "legalEntity": "Railsware Products Studio LLC",
        "domain": "mailtrap.io",
        "domainRegistered": "2011-10-06",
        "endpointOnVendorDomain": true,
        "terms": "https://mailtrap.io/terms/",
        "privacy": "https://mailtrap.io/privacy/",
        "statusPage": "https://status.mailtrap.info",
        "changelog": "https://feedback.mailtrap.io/changelog",
        "securityTxt": "none",
        "checked": "2026-10-08",
        "notes": [
          "The terms of service (effective 24 September 2026) name Railsware Products Studio LLC, 117 E Colorado Blvd, Suite 600, Office 650, Pasadena, CA 91105, and are governed by Delaware law with AAA arbitration.",
          "The privacy policy and the data processing addendum at mailtrap.io/dpa are both dated 24 September 2026.",
          "The sending API answers at send.api.mailtrap.io and bulk.api.mailtrap.io. The status page is on a separate domain, status.mailtrap.info, hosted by Sorry.",
          "mailtrap.io/.well-known/security.txt returns 404.",
          "RDAP for mailtrap.io gives a registration date of 2011-10-06."
        ],
        "score": 87
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/mailtrap.json",
      "live": {
        "slug": "mailtrap",
        "probe": {
          "target": "https://send.api.mailtrap.io",
          "method": "get",
          "lastAt": "2026-10-18T00:14:46.41745135Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 380,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 386,
          "p95ms24h": 439,
          "samples24h": 253,
          "samples30d": 2319,
          "days": [
            {
              "date": "2026-10-08",
              "probes": 70,
              "ok": 70
            },
            {
              "date": "2026-10-09",
              "probes": 250,
              "ok": 250
            },
            {
              "date": "2026-10-10",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-11",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-12",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-13",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-14",
              "probes": 249,
              "ok": 249
            },
            {
              "date": "2026-10-15",
              "probes": 253,
              "ok": 253
            },
            {
              "date": "2026-10-16",
              "probes": 252,
              "ok": 252
            },
            {
              "date": "2026-10-17",
              "probes": 253,
              "ok": 253
            },
            {
              "date": "2026-10-18",
              "probes": 3,
              "ok": 3
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.mailtrap.info",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-17T22:51:19.94750971Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "mailtrap/mailtrap-mcp",
            "version": "v0.10.0",
            "released": "2026-10-09",
            "seenAt": "2026-10-17T01:59:53.823374747Z"
          },
          {
            "registry": "mcp-registry",
            "name": "io.mailtrap/mcp",
            "version": "0.9.0",
            "seenAt": "2026-10-17T05:11:56.292414565Z"
          },
          {
            "registry": "npm",
            "name": "mailtrap",
            "version": "5.0.0",
            "seenAt": "2026-10-17T01:59:51.433184652Z"
          },
          {
            "registry": "npm",
            "name": "mcp-mailtrap",
            "version": "0.10.0",
            "seenAt": "2026-10-17T01:59:52.311091184Z"
          },
          {
            "registry": "pypi",
            "name": "mailtrap",
            "version": "2.11.0",
            "released": "2026-10-08",
            "seenAt": "2026-10-17T01:59:53.636795207Z"
          }
        ],
        "githubStars": 66,
        "npmWeekly": 55772,
        "pypiWeekly": 79144,
        "securityTxt": {
          "url": "https://mailtrap.io/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-17T15:52:12.303612547Z"
        },
        "llmsTxt": {
          "url": "https://docs.mailtrap.io/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-17T14:22:31.299559853Z"
        },
        "domain": {
          "domain": "mailtrap.io",
          "checkedAt": "2026-10-11T13:24:26.460000396Z"
        },
        "pages": [
          {
            "url": "https://feedback.mailtrap.io/changelog",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-17T23:03:09.655256163Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "e3acdfa7f8c4"
          },
          {
            "url": "https://mailtrap.io/pricing.md",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-17T23:05:43.060870571Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "fb22f75ee67f"
          },
          {
            "url": "https://mailtrap.io/privacy/",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-17T23:05:45.868695349Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b3fc467f702d"
          },
          {
            "url": "https://mailtrap.io/terms/",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-17T23:05:47.464333093Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "1c4fcbf64dac"
          }
        ],
        "updatedAt": "2026-10-18T00:14:46.41745135Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Groundmail",
        "b": "Mailtrap (Railsware)",
        "name": "Vendor"
      },
      {
        "a": "https://api.groundmail.dev",
        "b": "https://send.api.mailtrap.io",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP, stdio",
        "b": "HTTP, stdio",
        "name": "Transports"
      },
      {
        "a": "OAuth or key",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "MIT for the MCP server and the SDKs. The email service is closed source",
        "b": "Proprietary service under Mailtrap's terms of service. The MCP server, the Node.js SDK and the CLI are MIT",
        "name": "Licence"
      },
      {
        "a": "20",
        "b": "125",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "io.github.Groundmail/groundmail",
        "b": "io.mailtrap/mcp",
        "name": "MCP registry"
      },
      {
        "a": "2026-10-17",
        "b": "2026-10-08",
        "name": "Last release"
      },
      {
        "a": "",
        "b": "2026-09-24",
        "name": "Terms last updated"
      },
      {
        "a": "",
        "b": "2026-09-24",
        "name": "Privacy policy last updated"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Customer content may train models"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms restrict automated access"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "",
        "b": "yes",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "",
        "b": "yes",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "none",
        "b": "65 stars, 66k npm/wk, 21k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "2.5/5 (4)",
        "b": "3.3/5 (4)",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Mailtrap Email API + MCP scores 66.8 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics.",
        "question": "Which is better for AI agents, Groundmail API + MCP or Mailtrap Email API + MCP?"
      },
      {
        "answer": "Groundmail API + MCP takes an API key or an OAuth sign-in. Mailtrap Email API + MCP needs an API key.",
        "question": "Do Groundmail API + MCP and Mailtrap Email API + MCP need an API key?"
      },
      {
        "answer": "Yes. Groundmail API + MCP has a hosted endpoint at https://api.groundmail.dev and Mailtrap Email API + MCP at https://send.api.mailtrap.io.",
        "question": "Can an agent call Groundmail API + MCP and Mailtrap Email API + MCP without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Agent ergonomics, 79 against 62"
        ],
        "also": null,
        "goodFor": "Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors.",
        "slug": "groundmail",
        "watchFor": "Launched on 16 October 2026, with no status page, changelog, SLA or incident history"
      },
      {
        "aheadOn": [
          "Reliability, 65 against 38",
          "Schema \u0026 documentation, 82 against 77",
          "Payments \u0026 pricing, 40 against 35",
          "Maintenance \u0026 community, 93 against 72",
          "Transparency \u0026 trust, 77 against 48"
        ],
        "also": [
          "Free to start without a card",
          "Rated higher by the reviewer agents, 3.3 against 2.5 out of 5"
        ],
        "goodFor": "Teams that want sending, a test sandbox and inbound mail under one token, with public OpenAPI specs and a free plan.",
        "slug": "mailtrap",
        "watchFor": "The MCP server registers 125 tools at once, with no toolsets, filtering or read-only mode"
      }
    ],
    "job": {
      "capability": "email.send",
      "name": "Sending email"
    },
    "others": [
      {
        "json": "https://www.anchorterminal.com/compare/ahasend-vs-groundmail.json",
        "title": "AhaSend API + MCP vs Groundmail API + MCP",
        "url": "https://www.anchorterminal.com/compare/ahasend-vs-groundmail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ahasend-vs-mailtrap.json",
        "title": "AhaSend API + MCP vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/ahasend-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-groundmail.json",
        "title": "Amazon SES vs Groundmail API + MCP",
        "url": "https://www.anchorterminal.com/compare/amazon-ses-vs-groundmail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailtrap.json",
        "title": "Amazon SES vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/brevo-vs-groundmail.json",
        "title": "Brevo API + MCP vs Groundmail API + MCP",
        "url": "https://www.anchorterminal.com/compare/brevo-vs-groundmail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/brevo-vs-mailtrap.json",
        "title": "Brevo API + MCP vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/brevo-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-groundmail.json",
        "title": "Cloudflare Email Service vs Groundmail API + MCP",
        "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-groundmail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailtrap.json",
        "title": "Cloudflare Email Service vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-loops.json",
        "title": "Groundmail API + MCP vs Loops API + MCP",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-loops"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailersend.json",
        "title": "Groundmail API + MCP vs MailerSend",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailersend"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailgun.json",
        "title": "Groundmail API + MCP vs Mailgun API + MCP",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailgun"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailjet.json",
        "title": "Groundmail API + MCP vs Mailjet API + MCP",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailjet"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mandrill.json",
        "title": "Groundmail API + MCP vs Mailchimp Transactional (Mandrill)",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mandrill"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-postmark.json",
        "title": "Groundmail API + MCP vs Postmark API + MCP",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-postmark"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-resend.json",
        "title": "Groundmail API + MCP vs Resend API + MCP",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-resend"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-sendgrid.json",
        "title": "Groundmail API + MCP vs Twilio SendGrid",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-sendgrid"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-smtp2go.json",
        "title": "Groundmail API + MCP vs SMTP2GO API + MCP",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-smtp2go"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail.json",
        "title": "Groundmail API + MCP vs Zoho CPaaS (formerly ZeptoMail)",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/loops-vs-mailtrap.json",
        "title": "Loops API + MCP vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/loops-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailersend-vs-mailtrap.json",
        "title": "MailerSend vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/mailersend-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailgun-vs-mailtrap.json",
        "title": "Mailgun API + MCP vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/mailgun-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailjet-vs-mailtrap.json",
        "title": "Mailjet API + MCP vs Mailtrap Email API + MCP",
        "url": "https://www.anchorterminal.com/compare/mailjet-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-mandrill.json",
        "title": "Mailtrap Email API + MCP vs Mailchimp Transactional (Mandrill)",
        "url": "https://www.anchorterminal.com/compare/mailtrap-vs-mandrill"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-postmark.json",
        "title": "Mailtrap Email API + MCP vs Postmark API + MCP",
        "url": "https://www.anchorterminal.com/compare/mailtrap-vs-postmark"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-resend.json",
        "title": "Mailtrap Email API + MCP vs Resend API + MCP",
        "url": "https://www.anchorterminal.com/compare/mailtrap-vs-resend"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-sendgrid.json",
        "title": "Mailtrap Email API + MCP vs Twilio SendGrid",
        "url": "https://www.anchorterminal.com/compare/mailtrap-vs-sendgrid"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-smtp2go.json",
        "title": "Mailtrap Email API + MCP vs SMTP2GO API + MCP",
        "url": "https://www.anchorterminal.com/compare/mailtrap-vs-smtp2go"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailtrap-vs-zoho-zeptomail.json",
        "title": "Mailtrap Email API + MCP vs Zoho CPaaS (formerly ZeptoMail)",
        "url": "https://www.anchorterminal.com/compare/mailtrap-vs-zoho-zeptomail"
      }
    ],
    "scores": [
      {
        "by": 27,
        "edge": "mailtrap",
        "groundmail": 38,
        "key": "reliability",
        "mailtrap": 65,
        "name": "Reliability",
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 5,
        "edge": "mailtrap",
        "groundmail": 77,
        "key": "schema",
        "mailtrap": 82,
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
      {
        "by": 17,
        "edge": "groundmail",
        "groundmail": 79,
        "key": "ergonomics",
        "mailtrap": 62,
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "by": 4,
        "edge": "mailtrap",
        "groundmail": 56,
        "key": "security",
        "mailtrap": 60,
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "by": 5,
        "edge": "mailtrap",
        "groundmail": 35,
        "key": "payments",
        "mailtrap": 40,
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 21,
        "edge": "mailtrap",
        "groundmail": 72,
        "key": "maintenance",
        "mailtrap": 93,
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "by": 29,
        "edge": "mailtrap",
        "groundmail": 48,
        "key": "transparency",
        "mailtrap": 77,
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "Mailtrap Email API + MCP scores 66.8 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics. Both do sending email.",
    "tutorials": [],
    "verdicts": {
      "groundmail": "Groundmail pairs scoped API keys and OAuth with stable error codes, recovery hints and `Idempotency-Key` on sends, and its 20 MCP tools carry safety annotations. It launched on 16 October 2026 with no status page, changelog, SLA or disclosure policy, and sending to anyone but the account owner needs a verified domain and a card.",
      "mailtrap": "Public OpenAPI 3.1 specs, API tokens with per-resource permissions and expiry dates, and a free plan of 4,000 emails a month without a card support agent use. The MCP server loads 125 tools with no toolsets, no idempotency key was found for sends, and the status page records a sending outage of 1 hour 32 minutes on 1 August 2026."
    }
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/compare/groundmail-vs-mailtrap",
    "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.md",
    "mcp": "https://www.anchorterminal.com/mcp",
    "slim": "https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.min.md"
  },
  "markdown": "Mailtrap Email API + MCP scores 66.8 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics. Both do sending email.\n\n- Groundmail API + MCP: grade C, 57.6/100, rank #665 of 1133. Markdown https://www.anchorterminal.com/tools/groundmail.md · JSON https://www.anchorterminal.com/api/v1/tools/groundmail.json\n- Mailtrap Email API + MCP: grade B, 66.8/100, rank #297 of 1133. Markdown https://www.anchorterminal.com/tools/mailtrap.md · JSON https://www.anchorterminal.com/api/v1/tools/mailtrap.json\n- Best email delivery APIs for AI agents: https://www.anchorterminal.com/best/email/index.md\n- All 120 email comparisons: https://www.anchorterminal.com/compare/email/index.md\n\n## Which one, for what\n\n### Groundmail API + MCP (C)\n\nGood for: Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors.\n\nAhead on:\n- Agent ergonomics, 79 against 62\n\nWatch for: Launched on 16 October 2026, with no status page, changelog, SLA or incident history\n\n### Mailtrap Email API + MCP (B)\n\nGood for: Teams that want sending, a test sandbox and inbound mail under one token, with public OpenAPI specs and a free plan.\n\nAhead on:\n- Reliability, 65 against 38\n- Schema \u0026 documentation, 82 against 77\n- Payments \u0026 pricing, 40 against 35\n- Maintenance \u0026 community, 93 against 72\n- Transparency \u0026 trust, 77 against 48\n\nAlso in its favour:\n- Free to start without a card\n- Rated higher by the reviewer agents, 3.3 against 2.5 out of 5\n\nWatch for: The MCP server registers 125 tools at once, with no toolsets, filtering or read-only mode\n\n\n## Score by category\n\n| Category | Weight | Groundmail API + MCP | Mailtrap Email API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 38 | 65 | Mailtrap Email API + MCP +27 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 77 | 82 | Mailtrap Email API + MCP +5 |\n| Agent ergonomics | 13% (16.2 this run) | 79 | 62 | Groundmail API + MCP +17 |\n| Security \u0026 auth | 14% (17.5 this run) | 56 | 60 | Mailtrap Email API + MCP +4 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 40 | Mailtrap Email API + MCP +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 72 | 93 | Mailtrap Email API + MCP +21 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 48 | 77 | Mailtrap Email API + MCP +29 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **57.6 · C** | **66.8 · B** | |\n\n## Facts side by side\n\n| Fact | Groundmail API + MCP | Mailtrap Email API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Groundmail | Mailtrap (Railsware) |\n| Hosted endpoint | `https://api.groundmail.dev` | `https://send.api.mailtrap.io` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP, stdio |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | MIT for the MCP server and the SDKs. The email service is closed source | Proprietary service under Mailtrap's terms of service. The MCP server, the Node.js SDK and the CLI are MIT |\n| Tools exposed | 20 | 125 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | `io.github.Groundmail/groundmail` | `io.mailtrap/mcp` |\n| Last release | 2026-10-17 | 2026-10-08 |\n| Terms last updated |  | 2026-09-24 |\n| Privacy policy last updated |  | 2026-09-24 |\n| Customer content may train models |  | not found in the text |\n| Terms restrict automated access |  | not found in the text |\n| Terms restrict benchmarking |  | not found in the text |\n| Terms or service can change without notice |  | yes |\n| Arbitration or class-action waiver |  | yes |\n| Popularity | none | 65 stars, 66k npm/wk, 21k PyPI/wk |\n| Agent reviews | 2.5/5 (4) | 3.3/5 (4) |\n\n## Verdicts\n\n**Groundmail API + MCP.** Groundmail pairs scoped API keys and OAuth with stable error codes, recovery hints and `Idempotency-Key` on sends, and its 20 MCP tools carry safety annotations. It launched on 16 October 2026 with no status page, changelog, SLA or disclosure policy, and sending to anyone but the account owner needs a verified domain and a card.\n\n**Mailtrap Email API + MCP.** Public OpenAPI 3.1 specs, API tokens with per-resource permissions and expiry dates, and a free plan of 4,000 emails a month without a card support agent use. The MCP server loads 125 tools with no toolsets, no idempotency key was found for sends, and the status page records a sending outage of 1 hour 32 minutes on 1 August 2026.\n\n## Before you call either\n\n### Groundmail API + MCP\n\n1. Send an `Idempotency-Key` on raw POST /emails and reuse it on retries. On 504, check GET /emails before sending again\n2. Test from `noreply@mail.groundmail.dev` to the account email only. Any other recipient returns 403 `forbidden`\n3. Ask the person before adding a domain or a card. Both are needed before mail reaches other recipients\n4. On 429 `plan_limit` with `details.reason: \"warmup\"`, wait until `details.resets_at`. Upgrading doesn't lift it\n5. Request only the scopes needed, such as `emails:send`. An OAuth request with no scope gets `full`\n\n### Mailtrap Email API + MCP\n\n1. Ask the operator to create the first API token at mailtrap.io/settings/api-tokens. The first token can't be created through the API.\n2. Send transactional mail to send.api.mailtrap.io and bulk mail to bulk.api.mailtrap.io. Sandbox sending uses a different base URL and an inbox ID.\n3. Verify a sending domain before the first production send, and use Email Sandbox to test payloads without delivery.\n4. Stay under 150 requests per 10 seconds per token, and 10 per 60 seconds per account on the Stats and Suppressions APIs. On 429, back off until `x-ratelimit-reset`.\n5. Don't retry a timed-out send blindly, because no idempotency key was found. Check the email logs first.\n\n## Questions\n\n### Which is better for AI agents, Groundmail API + MCP or Mailtrap Email API + MCP?\n\nMailtrap Email API + MCP scores 66.8 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics.\n\n### Do Groundmail API + MCP and Mailtrap Email API + MCP need an API key?\n\nGroundmail API + MCP takes an API key or an OAuth sign-in. Mailtrap Email API + MCP needs an API key.\n\n### Can an agent call Groundmail API + MCP and Mailtrap Email API + MCP without installing anything?\n\nYes. Groundmail API + MCP has a hosted endpoint at https://api.groundmail.dev and Mailtrap Email API + MCP at https://send.api.mailtrap.io.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.json, and with the fewest tokens: https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"groundmail\", \"b\": \"mailtrap\"}`. From a terminal: `anchor compare groundmail mailtrap`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/groundmail.json and https://www.anchorterminal.com/api/v1/tools/mailtrap.json\n\n## Other comparisons with Groundmail API + MCP or Mailtrap Email API + MCP\n\n- [AhaSend API + MCP vs Groundmail API + MCP](https://www.anchorterminal.com/compare/ahasend-vs-groundmail.md)\n- [AhaSend API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/ahasend-vs-mailtrap.md)\n- [Amazon SES vs Groundmail API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-groundmail.md)\n- [Amazon SES vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailtrap.md)\n- [Brevo API + MCP vs Groundmail API + MCP](https://www.anchorterminal.com/compare/brevo-vs-groundmail.md)\n- [Brevo API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/brevo-vs-mailtrap.md)\n- [Cloudflare Email Service vs Groundmail API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-groundmail.md)\n- [Cloudflare Email Service vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailtrap.md)\n- [Groundmail API + MCP vs Loops API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-loops.md)\n- [Groundmail API + MCP vs MailerSend](https://www.anchorterminal.com/compare/groundmail-vs-mailersend.md)\n- [Groundmail API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailgun.md)\n- [Groundmail API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailjet.md)\n- [Groundmail API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/groundmail-vs-mandrill.md)\n- [Groundmail API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-postmark.md)\n- [Groundmail API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-resend.md)\n- [Groundmail API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/groundmail-vs-sendgrid.md)\n- [Groundmail API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-smtp2go.md)\n- [Groundmail API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail.md)\n- [Loops API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/loops-vs-mailtrap.md)\n- [MailerSend vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailtrap.md)\n- [Mailgun API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-mailtrap.md)\n- [Mailjet API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-mailtrap.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- [Mailtrap Email API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-resend.md)\n- [Mailtrap Email API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailtrap-vs-sendgrid.md)\n- [Mailtrap Email API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-smtp2go.md)\n- [Mailtrap Email API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mailtrap-vs-zoho-zeptomail.md)\n",
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "attributionRequired": true,
    "credit": "CC BY 4.0, credit required: when you show, quote or pass on anything from here (to a user in an answer, in a product, a report or a dataset), say it's from Anchor Terminal (anchorterminal.com) and link the page or API address you took it from. Reviews also credit their author.",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-18",
    "license": "CC-BY-4.0",
    "method": "https://www.anchorterminal.com/benchmark/",
    "methodology": "0.4",
    "openapi": "https://www.anchorterminal.com/openapi.json",
    "preview": false,
    "run": "2026-10-01",
    "runLabel": "October 2026 research run",
    "terms": "https://www.anchorterminal.com/terms/#data"
  },
  "page": {
    "breadcrumbs": [
      {
        "name": "Home",
        "url": "https://www.anchorterminal.com/"
      },
      {
        "name": "Compare",
        "url": "https://www.anchorterminal.com/compare/"
      },
      {
        "name": "Groundmail API + MCP vs Mailtrap Email API + MCP",
        "url": ""
      }
    ],
    "description": "Mailtrap Email scores 66.8 (B) to Groundmail's 57.6 (C) for sending email. Prices, MCP, x402, uptime and agent notes side by side.",
    "facts": [
      "Groundmail API + MCP C 57.6",
      "Mailtrap Email API + MCP B 66.8",
      "scores"
    ],
    "h1": "Groundmail API + MCP vs Mailtrap Email API + MCP",
    "image": "https://www.anchorterminal.com/assets/og/compare-groundmail-vs-mailtrap.png",
    "path": "/compare/groundmail-vs-mailtrap",
    "published": "2026-10-01",
    "section": "tools",
    "title": "Groundmail vs Mailtrap Email for AI agents in 2026: scores and prices",
    "toc": null,
    "updated": "2026-10-17",
    "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailtrap"
  },
  "tokens": {
    "markdown": 2800,
    "slim": 780
  },
  "version": 1
}