The full upstream README, mirrored here for reference. Install config, tool schemas, adoption signals, and an original overview live on the Nohumans.directory listing page.
Find and vet paid x402 API services before an agent spends money on them.
A discovery and trust layer for paid x402 services. We verify listings two ways: by paying them real USDC and recording whether they deliver, and by continuously re-probing every listing's live 402 challenge — several times an hour, with the full history kept. Each listing carries a recency-weighted reliability score built from that history, plus on-chain payment evidence from our own index of the chain — so an agent can check whether an endpoint actually delivers before paying for it.
Free. No API key. No signup. No account.
Live stats: https://nohumans.directory/stats · REST API: https://api.nohumans.directory
Most x402 directories are catalogs: they list what exists. Some probe whether a 402 comes back, which proves an endpoint is alive — not whether anyone actually pays it, or whether it delivers when paid.
This one buys from listings and publishes what came back, per call, with the
transaction hash. It probes every endpoint continuously and keeps the
history: a listing moves unverified → verified only after sustained clean
probes, and falls to failing when it stops responding. The reliability
score is recency-weighted, so a service that broke yesterday can't hide
behind a good month. And every listing shows its on-chain payment activity —
payments, distinct paying wallets, dollars, per day — from our own index of
USDC transfers on Base.
Every listing also carries a hand-written description of what the service actually does — which sounds mundane until you try semantic search against a catalog of bare URLs.
Remote server, streamable HTTP. No install, no build step, no credentials.
https://api.nohumans.directory/mcp
Transport: streamable-http · Authentication: none · Cost: free
For agents that support the Agent Skills standard
(Claude Code, Codex, and others), install the skill so the agent knows how
to use the tools below intelligently — when to prefer verified listings,
how to read score/status/x402_version/on-chain payment evidence, and
how to report a real outcome via tx_hash:
find_paid_serviceSearch paid x402 services by capability, price ceiling, and minimum reliability score. Returns ranked results — verified services first, then by reliability, then by price.
| Parameter | Type | Description |
|---|---|---|
query | string | Free-text search across service names and descriptions |
category | string | Exact category filter, e.g. data.fx, infra.trust |
max_price | number | Maximum price per call, in USDC |
min_score | number | Minimum reliability score, 0-1 |
limit | number | Max results, 1-50 (default 10) |
get_service_detailsFull record for a single service: pricing, accepted chains, request and response
schemas, current status, reliability score, median latency, probe count, protocol
version (x402_version), and on-chain payment evidence — 30-day totals, a
per-day series (onchain_daily), how many listings share the payment address,
and the sampled payment shape (x402-signed vs plain transfers vs other) —
everything an agent needs before making a paid call.
| Parameter | Type | Description |
|---|---|---|
id | string | Listing ID, as returned by find_paid_service |
resolve_endpointThe reverse lookup: you already hold an endpoint URL — from another catalog, a
prompt, a config file — and want this directory's verdict on it before paying.
Returns the same full record as get_service_details when the URL is listed,
a delisted warning if it was listed and later removed, or an explicit
not-listed result. Not-listed means never checked here, not unsafe.
| Parameter | Type | Description |
|---|---|---|
url | string | The endpoint URL exactly as held, query string included |
what_agents_are_asking_forFor sellers: the aggregate demand feed — what buyers searched this directory
for, ranked by how many distinct days a term was asked (not by volume, which is
trivially faked). Exclusions are published rather than hidden: queries under 5
characters, searches from clients that also edit listings here, and a floor of
3 distinct non-seller clients before a term appears. The window ends a day
behind live and the response says when. Same data as GET /v1/demand.
No parameters.
An agent that needs FX rates and won't pay more than half a cent, and refuses to touch anything with a reliability score under 0.9: