# agentprobe.org

> Of 13,160 remote endpoints listed across 37 public registries and probed with a real protocol handshake (last probe 2026-09-07T03:33 UTC), 36.9% answer and 31.5% answer correctly. Independent, read-only, methodology public. Aggregate numbers are CC BY 4.0 with attribution; bulk data is not public.

## Census
- [Current statistics (JSON)](https://agentprobe.org/api/stats.json): listings, endpoints, probed, alive, conformant, by endpoint kind — every number with its denominator and timestamp.
- [Methodology](https://agentprobe.org/methodology): what a probe does per protocol, the outcome state machine, score weights, politeness and exclusion.

## Endpoints
- [Endpoint list (JSON)](https://agentprobe.org/api/endpoints.json?kind=mcp&outcome=ok): filter by kind (mcp, a2a, ard, openapi, llm-api, x402) and outcome; paginate with limit/offset.
- [Endpoint detail (JSON)](https://agentprobe.org/api/endpoint/1.json): latest and historical probes, capabilities, protocol era, hosting AS.

## Snapshots and hosting
- [Census snapshots](https://agentprobe.org/api/census/latest.json): one frozen document per day for citing — `agentprobe.org, YYYY-MM-DD`; index at https://agentprobe.org/census.
- [Hosting (JSON)](https://agentprobe.org/api/hosting.json): origin AS and allocation country of probed endpoints, with alive share.
- Lookup: https://agentprobe.org/lookup?url=… resolves a known endpoint URL to its page; badge: https://agentprobe.org/badge/{id}.svg (grade A-F).

## Sources and overlap
- [Sources (JSON)](https://agentprobe.org/api/sources.json): the 37 registries and conventions harvested, with access method and verification status.
- [Overlap](https://agentprobe.org/overlap): which endpoints are listed in more than one registry.
- [Standards (JSON)](https://agentprobe.org/api/standards.json): 63 discovery/identity/registry specifications and drafts with mechanisms and well-known paths.

## For agents
- [OpenAPI (GET-only)](https://agentprobe.org/openapi.json)
- [A2A agent card](https://agentprobe.org/.well-known/agent-card.json): read-only skills — endpoint status, find live endpoints, who lists an endpoint, census summary.
- [ARD catalog](https://agentprobe.org/.well-known/ard.json)

## Optional
- [Design brief and probe specification](https://github.com/parismic/agentprobe)
- Exclusion: block User-Agent `agentprobe/` in robots.txt; honoured every run.