Annalist Web API
The web API from Annalist — 2 operation(s) for web.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Annalist Dev Web 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 web 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: Web
paths:
/v1/web/readiness:
get:
operationId: web_readiness
tags:
- Web
summary: 'Can an agent shop or work on this site: does it accept agent checkout, and does…'
description: 'One site''s agent readiness from our weekly census of 65,000 top sites: UCP and ACP agent checkout (its MCP endpoint, capabilities, payment handlers), A2A and MCP cards, a real llms.txt, robots.txt rules for 15 AI agents, x402, store and platform, Shopify store facts (ships-to countries, currency), and every change dated. A site not yet in the census is visited live. Measured by us. Signed.'
x-price: $0.005
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.005000'
protocols:
- x402: {}
parameters:
- name: domain
in: query
required: true
schema:
type: string
description: the site, for example allbirds.com
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:
domain: allbirds.com
store: true
platform: shopify
signals:
ucp: true
acp: false
llms_txt: true
ucp_version: '2026-08-25'
bots:
GPTBot: allowed
history: []
'402':
description: Payment required (x402 v2, USDC on Base or Solana)
servers:
- url: https://api.annalist.dev
/v1/web/census:
get:
operationId: web_census
tags:
- Web
summary: Which stores can shopping agents buy from, and how fast is agent checkout…
description: 'Our weekly census of 65,000 top sites: how many sites and stores publish UCP or ACP agent-checkout profiles, agent and MCP cards and llms.txt, which AI crawlers stores block, store platforms, and changes in the last 30 days. With signal=, the stores that have it (for example signal=ucp), most-linked first. Signed.'
x-price: $0.01
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.010000'
protocols:
- x402: {}
parameters:
- name: signal
in: query
required: false
schema:
type: string
description: 'optional: ucp, acp, a2a, mcp_card, llms_txt or x402: list stores with it'
- name: platform
in: query
required: false
schema:
type: string
description: 'optional: with signal=, only stores on this platform (shopify, magento...)'
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:
stores: 1800
signals:
ucp:
sites: 400
stores: 380
stores_with:
- - allbirds.com
- 812
'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