# routr

- [Quickstart](https://docs.routr.to/guides/quickstart.md): Call email validation with an API key.
- [Authentication](https://docs.routr.to/guides/authentication.md): Send a routr API key on every charged call.
- [MCP](https://docs.routr.to/guides/mcp.md): Call email validation from an MCP client.
- [CLI](https://docs.routr.to/guides/cli.md): Call email validation from the command line.
- [Routing](https://docs.routr.to/guides/routing.md): Choose smart, cheapest, or pinned for each call.
- [Credits](https://docs.routr.to/guides/credits.md): How a call is reserved, charged, and replayed.
- [Errors](https://docs.routr.to/guides/errors.md): Status codes an agent can branch on.
- [Versioning](https://docs.routr.to/guides/versioning.md): What can change in /v1, and when /v2 starts.
- [Data](https://docs.routr.to/guides/data.md): What routr stores, where it goes, and how long it stays.
- [Email validation](https://docs.routr.to/capabilities/email.validate.md): Says whether an email address can receive mail.
- [Lists every capability, its verdicts, and its integrations.](https://docs.routr.to/api-reference/v1/lists-every-capability-its-verdicts-and-its-integrations.md): Lists every capability, its verdicts, and its integrations.
- [Says whether an email address can receive mail.](https://docs.routr.to/api-reference/v1/says-whether-an-email-address-can-receive-mail.md): Says whether an email address can receive mail.
- [Process is up.](https://docs.routr.to/api-reference/health/process-is-up.md): Process is up.

## OpenAPI Specs

- [openapi](/openapi.json)


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