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For most use cases, the Resend SDK offers a better developer experience than calling the raw HTTP API directly. Resend maintains official, open source SDKs for Node.js, PHP, Python, Ruby, Go, Rust, Java, and .NET.
Recommendation: Use a Resend SDK for your language. Call the raw API directly only when no SDK exists for your stack.

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Choosing between the SDK and API

Reach for the SDK unless you have a specific reason not to. It handles authentication, the required User-Agent header, request serialization, typed responses, and error handling for you. That leaves less boilerplate to get wrong.
Resend SDK (recommended)Raw HTTP API
Auth & headersHandled automaticallySet Authorization and User-Agent manually
Types & autocompleteBuilt inNone
ErrorsStructured error objectsParse status codes and JSON yourself
Maintained byResendYou

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When to use the raw API directly

Calling the API directly is a good fit when:
  • There’s no official SDK for your language or runtime.
  • You’re making a one-off request and don’t want to add a dependency.
  • You’re building your own integration or wrapper.
If you do call the API directly, remember to set the required User-Agent header.

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Next steps

Official SDKs

Install the SDK for your language.

Quickstart

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API Reference

Full HTTP API documentation.

MCP Server

Give your AI agent access to Resend.