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Resend API for coding agents

View Agent Bench results API docs

Resend is unusually easy for coding agents to discover and connect because it offers a hosted MCP server, an official CLI, machine-readable documentation, and scoped credentials. Its Agent Bench task completed successfully.

#1of 7
Email API agent readiness

Passed the Agent Bench task evaluation, ranked first in the setup run, and publishes the broadest first-party agent integration path in this set.

Last checked Aug 17, 2026 11 primary sources Tested by All Them APIs
Agent Bench evidence

Discovery 100; task evaluation 65.

All Them APIs measured one Claude Code task. Discovery and task performance are reported separately.

All Them APIs · Email task

Claude Code task result

B75/100
Verification passed

Claude Code found the right integration path and completed the task, but needed several corrections around Resend's test-mode sending restrictions.

Discovery
100
Evaluation
65
Time
4m 24s
Tool calls
38
Errors
11
Cost
$0.64
This task score and the category setup ranking come from separate Agent Bench protocols.
View Agent Bench results
Agent verdict

Can a coding agent use Resend? Yes.

Use Resend's hosted MCP server when the agent should operate email directly, or install an official SDK when email belongs inside the application.

Strong first-party agent support
Review fit, workflows, and caveats

Good fit

  • Product teams sending transactional and lifecycle email
  • TypeScript and multi-language applications that prefer official SDKs
  • Teams that want CLI, MCP, and machine-readable documentation

Check before shipping

  • A verified domain is required before sending broadly
  • The free plan is capped at 100 transactional emails per day
  • The default API rate limit is five requests per second per team

Common workflows

  • Send transactional email
  • Receive and process inbound email
  • Track delivery, bounce, and complaint events
  • Manage contacts and marketing broadcasts
Recommended setupHosted MCP server
Codexcodex mcp add resend --url https://mcp.resend.com/mcp

Adds Resend as a remote MCP server and opens the authorization flow when needed.

Claude Codeclaude plugin install resend@claude-plugins-official

Installs Resend from Anthropic's official plugin directory.

Any MCP client"resend": { "url": "https://mcp.resend.com/mcp" }

Use the hosted endpoint in clients that accept remote MCP server configuration.

Open official setup documentation
Reference

API limits and source records

Base URL, authentication, pricing, SDKs, rate limits, and checked documentation.

API basics
Base URL
https://api.resend.com
Authentication
Bearer API key and OAuth 2.1 with PKCE
Free tier
3,000 transactional emails per month, capped at 100 per day
Credit card
Not required
Rate limit
5 requests per second per team; increases available by request
Testing
Test addresses simulate delivery, bounce, complaint, and suppression events
10 official SDKs
Node.jsPHPLaravelPythonRubyGoJavaRust.NETChat SDK adapter
11 checked sources
API introductionREST base URL · Bearer authentication · rate limit · response codes · versioningOfficial SDKs and OpenAPIofficial SDKs · OpenAPI repositoryPricingfree tier · daily quota · pricing model · credit card requirementAPI key permissionsscoped API keys · domain-restricted sending accessOAuth supportOAuth 2.1 · PKCE · dynamic client registration · OAuth scopesOfficial MCP serverMCP transports · Claude Code · Codex · Cursor · non-interactive authOfficial CLICLI · agent and CI usage · credential resolutionTest email addressestest delivery · test bounce · test complaint · test suppressionWebhook documentationwebhooks · local webhook development · retry behaviorIdempotency keysidempotent email requests · 24-hour key lifetimeAPI errorsstructured error types · suggested recovery actions
Pricing, status, and alternatives
PricingStatusChangelogGitHubLoopsPostmarkSendGridMailgun

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