# apis.dev

> The API development platform: one Definition, every Interface, one posted rate on every call, every call kept.

Links are relative to https://apis.dev; every page is Markdown at its URL plus `.md`. The docs MCP server is `POST /mcp` (tools `search` and `fetch`). Every example uses an invented sample API on its own host.

## Platform

What the platform is, what it guarantees, and the path from a Definition to a call. [Overview](/platform.md)

[Guarantees](/platform/guarantees.md) · [From Definition to call](/platform/lifecycle.md)

## Define

How an API is defined: its Product, operations, Offer and Wrapped Sources. [Overview](/define.md)

[Define an API product](/quickstart.md) · [Product](/define/product.md) · [Operation](/define/operations.md) · [Offers](/define/offers.md) · [Wrapped Source](/define/sources.md)

## Publish

Where an API answers, and the records publishing it writes. [Overview](/publish.md)

[Your API on your own domain](/publish/hosting.md) · [What publishing writes](/publish/publication.md)

## Interfaces

What every API gets from its one Definition, on its own host. [Overview](/interfaces.md)

## Callers

Keys, the test twin, and the gates every call passes. [Overview](/callers.md)

[Key](/callers/keys.md)

## Evidence

What every call leaves behind: Problems, the call record and provenance. [Overview](/evidence.md)

[Errors](/evidence/errors.md) · [Call record](/evidence/call-record.md) · [Provenance](/evidence/provenance.md)

## Reference

Every concept, defined in one sentence. [Overview](/reference.md)

[Concepts](/reference/concepts.md)

## Optional

- [Platform, every page](/platform/llms.txt): 165 tokens
- [Define, every page](/define/llms.txt): 310 tokens
- [Publish, every page](/publish/llms.txt): 157 tokens
- [Interfaces, every page](/interfaces/llms.txt): 69 tokens
- [Callers, every page](/callers/llms.txt): 98 tokens
- [Evidence, every page](/evidence/llms.txt): 204 tokens
- [Reference, every page](/reference/llms.txt): 95 tokens
- [llms-full.txt](/llms-full.txt): every page in one file, except the one-per-code error pages, which the Errors catalog lists
- [sitemap.xml](/sitemap.xml)