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
For buyers: Live x402 buyer check covers the free RLUSD preview, current signed 402 offer and delivery checks. Re-read the live challenge and catalogue before acting; the September census below is a dated measurement, not a current price or settlement guarantee.
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 +… See the full description on the dataset page: https://huggingface.co/datasets/csoai/x402-bazaar-conformance.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.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.