datasets
Training and evaluation data, with the modality, task and licence stated up front. Listed live from the Hugging Face Hub.
x402-bazaar-conformance
x402 Bazaar conformance census
3,520 distinct hosts, every one listed in a public x402 Bazaar
(Coinbase CDP or PayAI), probed 2026-09-05.
hosts
share
conform (402 + PAYMENT-REQUIRED + x402Version 2 + extensions.bazaar)
394
11.19%
answer 402 at all
1,536
43.64%
carry the PAYMENT-REQUIRED header
1,395
declare x402Version 2
538
carry the bazaar extension an indexer reads
413
do not respond at all
1,027
29.18%
Being listed is not the same as… See the full description on the dataset page: https://huggingface.co/datasets/csoai/x402-bazaar-conformance.x402-market-pulse
x402 Market Pulse
A small, growing time series of how much USDC actually settles through x402 pay-per-call APIs on Base,
measured from on-chain Transfer logs rather than from provider-reported call counts. One row per
measurement; every row is a trailing 24-hour window ending at measured_at_utc.
Status: bootstrapping. 44 rows spanning 2026-09-22T13:34Z to 2026-09-24T12:00Z —
less than one independent day of data so far. Rows are kept to at most one per clock hour and a new one… See the full description on the dataset page: https://huggingface.co/datasets/nimapro1381/x402-market-pulse.x402-price-index
x402 Price Index — a census of the machine-payable web
Most directories of x402 services list what merchants claim. This dataset records
what their endpoints actually answer when probed: the HTTP 402 challenge they
return, the price inside it, the chain and asset they want, and whether they respond
at all.
It is built by Animica from an independent prober that walks
every x402 endpoint it can discover and reads each merchant's own accepts[] block.
No merchant self-reporting is… See the full description on the dataset page: https://huggingface.co/datasets/animicaorg/x402-price-index.x402-settlement-census
x402 settlement census — 2026-09-06
We paid 316 conformant x402 hosts as an ordinary buyer and recorded what came back.
Not a survey of what hosts advertise — a record of what they did when real USDC arrived.
outcome
hosts
share
REFUSED
213
67.4%
DELIVERED
100
31.6%
NO_CHALLENGE
2
0.6%
MISMATCH
1
0.3%
Two in three conformant hosts refused a correctly-signed payment. Being listed in a Bazaar index
and answering a valid 402 is not the same as taking money and… See the full description on the dataset page: https://huggingface.co/datasets/csoai/x402-settlement-census.x402-bazaar-census
x402 Bazaar Census
A dated, reproducible enumeration of the public x402 Bazaar discovery index — the catalogue
autonomous agents search to find services they can pay for over HTTP 402.
As far as we can establish, nobody has published a measurement of this index before.
As of 2026-09-04T15:48:58Z · content sha256 efc93ac5e76d506ecd6778cf4d323138…
What the index looks like
resources fetched
28,136
resources the index reports
28,136
coverage
100.0%… See the full description on the dataset page: https://huggingface.co/datasets/csoai/x402-bazaar-census.x402-service-index
x402 Service Index
A free, daily-refreshed snapshot of live x402 pay-per-call API services discovered across
the public Coinbase CDP bazaar and PayAI discovery feeds, each one live-probed with one unpaid
request per crawl so alive reflects a real answer, not a directory listing.
400 services tracked, 395 alive as of the latest crawl (generated_at field in index.json).
Fields: resource, method, network, price_usd, alive. network is a CAIP-2 chain id
(e.g. eip155:8453 = Base).… See the full description on the dataset page: https://huggingface.co/datasets/nimapro1381/x402-service-index.preflight-dataset-v0_1
x402station.io Preflight Dataset v0.1
x402station.io Preflight Dataset v0.1 — aggregated probe data from the x402 agentic-commerce network.
This dataset is a weekly public snapshot of endpoint-level aggregate health and risk signals used by Preflight by x402station.io. It is designed for citation, reproducibility, ecosystem analysis, and lightweight agent-routing research without exposing the raw probe-by-probe time-series that powers the paid API.
Canonical service:… See the full description on the dataset page: https://huggingface.co/datasets/x402station/preflight-dataset-v0_1.x402-agent-data-gateway-samples
x402 Agent Data Gateway — Sample Outputs
Real sample responses from a live, pay-per-call data gateway for AI agents. Your agent does an HTTP GET,
gets a 402 Payment Required, pays a few cents of USDC on Base (x402), and receives clean structured JSON.
No API keys, no signup, no subscription. This dataset shows exactly what you get back.
Why
Autonomous agents need to enrich a company by domain or profile a wallet before they transact, but the
good sources (Clearbit… See the full description on the dataset page: https://huggingface.co/datasets/epistemedeus/x402-agent-data-gateway-samples.x402-pii-corpus
x402 PII Metadata Corpus
Synthetic labelled corpus of 2,000 x402 payment metadata triples for PII filter evaluation.
Released alongside the paper "Hardening x402: Privacy-Preserving Agentic Payments via Pre-Execution Metadata Filtering".
Paper: arXiv:2604.11430 [cs.CR]
Canonical archive: IEEE DataPort doi:10.21227/kpsz-nq73
Code: presidio-v/presidio-hardened-x402
Dataset description
Each record represents one x402 payment metadata triple (resource_url, description… See the full description on the dataset page: https://huggingface.co/datasets/vstantch/x402-pii-corpus.x402-spec
x402 Protocol Specification
HTTP 402 Payment Required for AI agent micropayments.
Overview
x402 is the production implementation of HTTP 402 (reserved since 1998) for the autonomous agent economy. It enables machine-to-machine micropayments over USDC on Solana.
How It Works
Agent requests a protected resource → HTTP 402 with payment challenge
Agent parses challenge, submits USDC payment on Solana
Gateway confirms settlement (~2-3 Solana slots)
Protected… See the full description on the dataset page: https://huggingface.co/datasets/NullStateV1/x402-spec.