# Fly.io Extensions API

**Canonical:** https://apis.io/apis/fly-io/extensions-api/  
**Provider:** fly-io — https://apis.io/providers/fly-io/  
**Base URL:** https://api.example.com  
**Documentation:** https://fly.io/docs/reference/extensions_api/

Fly.io Extensions API is one of 9 APIs that [fly-io](https://apis.io/providers/fly-io/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification. Tagged areas include Extensions, Integration, Partner, Platform, and Provisioning. The published artifact set on APIs.io includes API documentation, an OpenAPI specification, and an AsyncAPI specification.

The Fly.io Extensions API is a provider-facing HTTP interface that enables third-party services to integrate with the Fly.io platform as extension providers. When a Fly.io user provisions an extension via the flyctl CLI, Fly.io forwards the provisioning request to the provider's API with details about the requesting organization, and the provider responds with environment variable configuration that is attached to the target application.

## Machine-readable artifacts (4)

- **Documentation** — https://fly.io/docs/reference/extensions_api/
- **Documentation** — https://fly.io/docs/about/extensions/
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/fly-io/refs/heads/main/openapi/fly-io-extensions-api-openapi.yml
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/fly-io/refs/heads/main/asyncapi/fly-io-extensions-webhooks-asyncapi.yml

## Other fly-io APIs (8)

- [Fly.io Machines API](https://apis.io/apis/fly-io/machines-api/)
- [Fly.io GraphQL API](https://apis.io/apis/fly-io/graphql-api/)
- [fly-io Apps API](https://apis.io/apis/fly-io/fly-io-apps-api/)
- [fly-io OAuth API](https://apis.io/apis/fly-io/fly-io-oauth-api/)
- [fly-io SSO API](https://apis.io/apis/fly-io/fly-io-sso-api/)
- [fly-io Tokens API](https://apis.io/apis/fly-io/fly-io-tokens-api/)
- [fly-io Volumes API](https://apis.io/apis/fly-io/fly-io-volumes-api/)
- [fly-io Webhooks API](https://apis.io/apis/fly-io/fly-io-webhooks-api/)

## Tags

Extensions, Integration, Partner, Platform, Provisioning

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/fly-io/extensions-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/fly-io/.