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Annalist Web Census
x402
Annalist Web Census is a paid API for AI agents from api.annalist.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).
Returns a weekly census of 65,000 top websites tracking adoption of AI agent protocols (UCP, ACP, MCP cards, llms.txt, x402), AI crawler blocking behavior, and store platform distribution, with optional filtering by signal type.
Price / call$0.01
Success—
StatusUnknown
How this service works
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.
Output
A signed JSON response containing aggregate counts of sites and stores with each AI agent protocol (UCP, ACP, MCP card, llms.txt, x402), AI crawler blocking rates by crawler, store platform distribution, 30-day deltas, and optionally a ranked list of stores matching a specific signal — all cryptographically signed for agent trust.
Example use cases
Track UCP agent checkout adoption
“Give me the current Annalist census breakdown for UCP — how many of the top 65,000 sites have it, and list the stores that support it ranked by link count.”
Monitor AI crawler blocking trends
“Pull the Annalist weekly census and tell me how many top sites are blocking AI crawlers and how that's changed in the last 30 days.”
Find Shopify stores with llms.txt
“From the Annalist census, show me all Shopify stores that have published llms.txt, ordered by most-linked first.”
Technical details
Endpoint
GEThttps://api.annalist.dev/v1/web/census?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a broad, aggregated view of AI agent protocol adoption across the top 65,000 websites — ideal for market research, competitive benchmarking, or tracking how the agent-ready web is growing. For a single site's agent readiness profile, use the per-site sibling endpoint instead.
Side effects
- Invalid signal value returns error (must be one of: ucp, acp, a2a, mcp_card, llms_txt, x402)
- Payment failure via x402 prevents data return
- Stale data if census has not refreshed that week
- Platform filter with no matching signal may return empty store list
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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