openapi: 3.1.0
info:
  title: Fly.io Extensions Apps Tokens API
  description: 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 user, and the provider responds with environment variable configuration that is attached to the target application. Providers must also support single sign-on login flows using OAuth, daily billing detail endpoints, and webhook delivery for resource lifecycle events. Extensions currently available through this program include Sentry, Supabase, Tigris object storage, Upstash Redis and Vector, and others.
  version: '1.0'
  contact:
    name: Fly.io Extensions Program
    url: https://fly.io/docs/reference/extensions_api/
  termsOfService: https://fly.io/legal/terms-of-service/
servers:
- url: https://{provider_base_url}
  description: Provider-hosted API server. Each extension provider hosts their own implementation of this API at a URL they register with Fly.io.
  variables:
    provider_base_url:
      default: api.example.com
      description: The base URL registered by the extension provider with Fly.io.
- url: https://api.fly.io
  description: Fly.io platform server for OAuth and webhook endpoints.
security:
- flySharedSecret: []
tags:
- name: Tokens
  description: Operations for requesting OpenID Connect (OIDC) tokens from third-party services, enabling Fly Machines to authenticate to external systems using workload identity.
paths:
  /v1/tokens/oidc:
    post:
      operationId: getOidcToken
      summary: Get an OIDC token
      description: Requests an OpenID Connect (OIDC) token for the calling Fly Machine. The token can be used to authenticate to third-party services that support OIDC workload identity, such as AWS, GCP, or Vault. The optional aud field controls the audience claim embedded in the JWT.
      tags:
      - Tokens
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                aud:
                  type: string
                  description: The audience claim for the OIDC token. Specifies the recipient service that will accept this token, such as https://fly.io/my-org-slug.
                  example: https://fly.io/my-org-slug
      responses:
        '200':
          description: OIDC token as a raw JWT string.
          content:
            application/json:
              schema:
                type: string
                description: A signed JWT OIDC token.
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Missing or invalid API token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    ErrorResponse:
      type: object
      description: A standard error response returned by the API on failure.
      properties:
        error:
          type: string
          description: Human-readable error message describing what went wrong.
        status:
          type: integer
          description: HTTP status code.
  securitySchemes:
    flySharedSecret:
      type: http
      scheme: bearer
      description: Shared secret provided by Fly.io to the extension provider. Fly.io includes this secret in an Authorization Bearer header on all requests to the provider's API for verification.
    oauthBearerAuth:
      type: http
      scheme: bearer
      description: Fly.io OAuth access token obtained from the token exchange endpoint.
    webhookHmac:
      type: apiKey
      in: header
      name: X-Fly-Signature
      description: HMAC-SHA256 signature of the raw request body, computed using the webhook signing secret. Recipients must verify this signature before processing the payload.
externalDocs:
  description: Fly.io Extensions API Documentation
  url: https://fly.io/docs/reference/extensions_api/