{
 "categories": [
  "email",
  "communications"
 ],
 "deployment": "saas",
 "evidence": [
  {
   "date": "2026-09-22",
   "fact": "homepage",
   "note": "Resend presents an email API for developers covering transactional and marketing send, inbound, templates, and MCP.",
   "source": "https://resend.com/",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "license",
   "note": "Transactional Free is $0/mo for 3,000 emails. Pro starts at $20/mo. Scale and Enterprise are paid.",
   "source": "https://resend.com/pricing",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.api.exists",
   "note": "Resend documents a REST API at https://api.resend.com. HTTPS is required.",
   "source": "https://resend.com/docs/api-reference/introduction",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.api.kinds[0]",
   "note": "Send is POST https://api.resend.com/emails with a JSON body (from, to, subject, html).",
   "source": "https://resend.com/docs/api-reference/emails/send-email",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.api.auth[0]",
   "note": "Authenticate with Authorization: Bearer re_xxxxxxxxx. Requests without a User-Agent receive 403.",
   "source": "https://resend.com/docs/api-reference/introduction",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.api.coverage",
   "note": "The send endpoint covers HTML, text, attachments, CC/BCC, scheduling, tags, templates, and idempotency keys. Homepage and MCP docs add batch, inbound, contacts, and domains.",
   "source": "https://resend.com/docs/api-reference/emails/send-email",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.exists",
   "note": "Resend publishes official open-source client libraries.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.official",
   "note": "The page is titled Official SDKs and lists Resend GitHub repositories.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[0]",
   "note": "Node.js: github.com/resend/resend-node.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[1]",
   "note": "PHP: github.com/resend/resend-php.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[2]",
   "note": "Python: github.com/resend/resend-python.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[3]",
   "note": "Ruby: github.com/resend/resend-ruby.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[4]",
   "note": "Go: github.com/resend/resend-go.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[5]",
   "note": "Java: github.com/resend/resend-java.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[6]",
   "note": "Rust: github.com/resend/resend-rust.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.sdk.languages[7]",
   "note": ".NET: github.com/resend/resend-dotnet.",
   "source": "https://resend.com/docs/sdks",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.mcp.first_party",
   "note": "Resend hosts a remote Streamable HTTP MCP at https://mcp.resend.com/mcp with OAuth or a Bearer API key, and publishes the same server as npm resend-mcp.",
   "source": "https://resend.com/docs/knowledge-base/mcp-server",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.cli.exists",
   "note": "Resend documents an official CLI that covers the full API surface for humans, agents, and CI/CD.",
   "source": "https://resend.com/docs/cli",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.extensibility.webhooks",
   "note": "Resend webhooks POST JSON events such as email.bounced to an HTTPS URL. Failed deliveries retry on a documented schedule.",
   "source": "https://resend.com/docs/dashboard/webhooks/introduction",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.data_access.export[0]",
   "note": "Authenticated REST responses are JSON. Some endpoints support cursor pagination.",
   "source": "https://resend.com/docs/api-reference/introduction",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.data_access.import[0]",
   "note": "POST /emails accepts JSON to create and send messages, including template variables.",
   "source": "https://resend.com/docs/api-reference/emails/send-email",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "modalities.agent_docs.llms_txt",
   "note": "Opened a real llms.txt documentation index for Resend docs.",
   "source": "https://resend.com/docs/llms.txt",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "verdict.scores.api",
   "note": "REST plus Bearer keys, official SDKs, OpenAPI, idempotency keys, and webhooks is unusually complete. Score 9. Calendar versioning is planned, not present.",
   "source": "https://resend.com/docs/api-reference/introduction",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "verdict.scores.mcp",
   "note": "Official hosted MCP covers send, inbound, templates, contacts, broadcasts, domains, and webhooks. Inboxes is beta and remote-only, so the score is 8.",
   "source": "https://resend.com/docs/knowledge-base/mcp-server",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "verdict.scores.cli",
   "note": "Official CLI with resend login, env-var auth, and non-interactive emails send. Score 8.",
   "source": "https://resend.com/docs/cli",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "freshness.watch[0].url",
   "note": "Opened the current MCP docs, including the hosted URL, OAuth and Bearer auth, local resend-mcp, and the tool list.",
   "source": "https://resend.com/docs/knowledge-base/mcp-server",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "freshness.watch[1].url",
   "note": "Opened the current REST introduction for base URL, Bearer auth, User-Agent, and rate limits.",
   "source": "https://resend.com/docs/api-reference/introduction",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "freshness.watch[2].url",
   "note": "Opened the current official CLI guide.",
   "source": "https://resend.com/docs/cli",
   "tier": "declared"
  },
  {
   "date": "2026-09-22",
   "fact": "freshness.watch[3].url",
   "note": "Opened the current docs llms.txt index.",
   "source": "https://resend.com/docs/llms.txt",
   "tier": "declared"
  }
 ],
 "freshness": {
  "last_verified": "2026-09-22",
  "volatility": "high",
  "watch": [
   {
    "type": "mcp",
    "url": "https://resend.com/docs/knowledge-base/mcp-server"
   },
   {
    "type": "docs",
    "url": "https://resend.com/docs/api-reference/introduction"
   },
   {
    "type": "docs",
    "url": "https://resend.com/docs/cli"
   },
   {
    "type": "docs",
    "url": "https://resend.com/docs/llms.txt"
   }
  ]
 },
 "homepage": "https://resend.com/",
 "id": "resend",
 "license": "freemium",
 "modalities": {
  "agent_docs": {
   "llms_txt": true
  },
  "api": {
   "auth": [
    "bearer-api-key"
   ],
   "coverage": "full",
   "docs": "https://resend.com/docs/api-reference/introduction",
   "exists": true,
   "kinds": [
    "rest"
   ]
  },
  "cli": {
   "exists": true
  },
  "computer_use": {
   "issues": [],
   "viability": "unknown"
  },
  "data_access": {
   "export": [
    "json"
   ],
   "import": [
    "json"
   ]
  },
  "extensibility": {
   "scripting": [],
   "webhooks": true
  },
  "integrations": {
   "make": "unknown",
   "n8n": "unknown",
   "power_automate": "unknown",
   "zapier": "unknown"
  },
  "mcp": {
   "first_party": true,
   "third_party": [],
   "verdict": "official"
  },
  "rpa": {
   "drivability": "unknown",
   "notes": "No repeatable UI probe was run. Resend REST, official SDKs, CLI, webhooks, and hosted MCP cover send, inbound, contacts, and domain automation without browser control.\n",
   "ui_stack": [
    "web-dom"
   ],
   "vendor_support": []
  },
  "sdk": {
   "exists": true,
   "languages": [
    "node",
    "php",
    "python",
    "ruby",
    "go",
    "java",
    "rust",
    "csharp"
   ],
   "official": true
  }
 },
 "name": "Resend",
 "platforms": [
  "web"
 ],
 "related": {
  "alternatives": [
   "twilio",
   "mailchimp"
  ],
  "our_products": []
 },
 "schema_version": 1,
 "score_version": 1,
 "status": "active",
 "vendor": "Resend",
 "verdict": {
  "best_path": "api",
  "scores": {
   "api": 9,
   "cli": 8,
   "computer_use": null,
   "integrations": null,
   "mcp": 8,
   "overall": 9,
   "rpa": null
  },
  "summary": "Resend is automatable today through its REST API. This record is the Resend transactional and marketing email platform (emails, inbound, templates, contacts, broadcasts, automations, domains, segments, and webhooks). It is not Twilio SendGrid or Mailchimp. The API is REST HTTPS at https://api.resend.com. Authenticate with Authorization: Bearer re_... and include a User-Agent. POST /emails sends mail; official SDKs cover Node.js, PHP, Python, Ruby, Go, Java, Rust, and .NET. The official CLI (`resend`) installs via npm, Homebrew, or install.sh, authenticates with resend login or RESEND_API_KEY, and can send mail non-interactively. Webhooks POST signed JSON events such as email.bounced. A first-party hosted MCP at https://mcp.resend.com/mcp uses Streamable HTTP with OAuth or a Bearer API key. The same code ships as npm resend-mcp for local stdio. Documented MCP tools cover send, inbound, templates, contacts, broadcasts, automations, domains, webhooks, and logs. Inboxes tools are beta and remote-only. Free plan includes 3,000 emails per month. Computer-use viability is unassessed. API scores 9 and is the best path. MCP scores 8 because inboxes are beta and remote-only.\n"
 }
}