Annalist APIs API
The Apis API from Annalist — 3 operation(s) for apis.
Work with this as data
Every API here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for apis
7 MCP tools reach this
find_apisBrowse and filter every API in the catalog.get_api_artifactsOne API's artifacts, grouped by type.get_openapiThe primary OpenAPI for this API.find_similar_apisAPIs that look like this one.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
This API
curl "https://apis.io/api/v1/apis/annalist-dev:annalist-dev-apis-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"Discovery needs no key. Ratings and market analysis are Pro.
Get an API key
Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.
A second provider on the same verified email joins the account you already have.
OpenAPI Specification
openapi: 3.2.0
info:
title: Annalist Dev APIs API
version: 0.9.0
x-guidance: 'Annalist sells signed data for agents, priced per call over x402 (USDC on Base or Solana). Start with the free GET /v1/catalog: every paid route with the question it answers, its price and an example. Hyperliquid in one call: GET /v1/perp/full?coin=BTC (crowd state, smart-money positioning, liquidation levels). Before paying an x402 service: GET /v1/checks/service?host=, or the free GET /v1/verify/attestation?host=. Before connecting an MCP server: GET /v1/mcp/server?url=, or the free GET /v1/verify/mcp?url=. Before an agent shops on a site: the free GET /v1/verify/store?domain=, or GET /v1/web/readiness?domain=. Every answer is Ed25519-signed; the key is at /.well-known/annalist-key.json. Not investment advice.'
description: 'Operations tagged Apis across 2 of this provider''s published API definitions: annalist-dev-openapi.json, openapi.json. Each path carries the servers of the definition it was published in.'
servers:
- url: https://api.annalist.dev
tags:
- name: APIs
paths:
/v1/apis/request:
get:
operationId: free_apis_request
summary: 'Free: ask us to watch a public API''s OpenAPI or Swagger spec; its contract…'
security: []
parameters:
- name: spec
in: query
required: false
schema:
type: string
description: https URL of the spec (JSON or YAML)
responses:
'200':
description: Free
content:
application/json:
schema:
type: object
tags:
- APIs
servers:
- url: https://api.annalist.dev
/v1/apis/changes:
get:
operationId: apis_changes
tags:
- APIs
summary: Did the APIs my agent calls change their contracts, and would the change break…
description: 'Dated contract changes in widely used public APIs (Stripe, GitHub, OpenAI, Twilio, Slack, Plaid, Datadog and more), from their published OpenAPI descriptions read daily: operations, parameters and request fields added, removed or newly required, each change marked breaking or not. Last 1 to 90 days, one API with api=, or only breaking changes with breaking=true. Signed.'
x-price: $0.01
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.010000'
protocols:
- x402: {}
parameters:
- name: days
in: query
required: false
schema:
type: string
description: how many days back, 1 to 90 (default 30)
- name: api
in: query
required: false
schema:
type: string
description: 'optional: one API, for example stripe or github'
- name: breaking
in: query
required: false
schema:
type: string
description: 'optional: true for breaking changes only'
responses:
'200':
description: Signed data
content:
application/json:
schema:
type: object
required:
- as_of
- data
- signature
properties:
as_of:
type: string
format: date-time
data:
type: object
method:
type: object
request_id:
type: string
stale:
type: boolean
sources:
type: array
items:
type: string
notice:
type: string
key_id:
type: string
signature:
type: string
description: Ed25519 over RFC 8785 canonical JSON of {as_of, data, method, request_id}
signature_info:
type: string
example:
data:
days: 30
changes:
- date: '2026-10-20'
api: stripe
breaking: false
counts:
added: 3
removed: 0
changed: 5
added_ops:
- POST /v1/billing/alerts
'402':
description: Payment required (x402 v2, USDC on Base or Solana)
servers:
- url: https://api.annalist.dev
/v1/apis/api:
get:
operationId: apis_api
tags:
- APIs
summary: What does this API's contract look like today, and how has it changed?
description: 'One watched public API''s contract record: current version, operation count and keys, deprecated operations, security schemes, and every dated change in the last 90 days with what broke. From the provider''s published OpenAPI description, read daily. Without name=, lists the APIs we watch. Signed.'
x-price: $0.005
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.005000'
protocols:
- x402: {}
parameters:
- name: name
in: query
required: false
schema:
type: string
description: the API, for example stripe, github, openai
responses:
'200':
description: Signed data
content:
application/json:
schema:
type: object
required:
- as_of
- data
- signature
properties:
as_of:
type: string
format: date-time
data:
type: object
method:
type: object
request_id:
type: string
stale:
type: boolean
sources:
type: array
items:
type: string
notice:
type: string
key_id:
type: string
signature:
type: string
description: Ed25519 over RFC 8785 canonical JSON of {as_of, data, method, request_id}
signature_info:
type: string
example:
data:
api: stripe
version: 2026-09-30.endive
operations: 612
breaking_changes_90d: 0
changes_90d: []
'402':
description: Payment required (x402 v2, USDC on Base or Solana)
servers:
- url: https://api.annalist.dev
x-refined-from:
- annalist-dev-openapi.json
- openapi.json