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x402 Seller Conformance Roster
x402
x402 Seller Conformance Roster is a paid API for AI agents from www.blockchainiq.co, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Returns a daily-ranked list of the top 1,000 x402 protocol sellers graded A–F by automated conformance probes covering uptime, schema validity, payment terms, and usage metrics.
Price / call$0.02
Success—
StatusUnknown
How this service works
Parameter-free: the Blockchain IQ x402 Conformance Index in one call. The top 1,000 x402 sellers ranked by an A to F grade from our own daily unpaid probe of their listed endpoints: valid HTTP 402, x402 v2, payment terms, schema, 7-day uptime, price range, 30-day payers and calls, with method and sources. Dated each day; never sold when the probe is over 48 hours old. Use to screen endpoints for protocol conformance before an agent pays. JSON, no API key. $0.02 per call. Blockchain IQ.
Output
A JSON array of up to 1,000 x402 seller records, each containing: seller endpoint URL, conformance grade (A–F), HTTP 402 validity, x402 v2 compliance flag, payment terms and schema status, 7-day uptime percentage, price range, 30-day payer count, 30-day call count, probe method, data sources, and the probe date. The dataset is only served when the underlying probe is less than 48 hours old.
Example use cases
Pre-payment endpoint vetting
“I'm about to have my agent pay several x402 sellers — can you pull today's x402 conformance roster and filter it to only show sellers with an A or B grade so I know which ones are safe to pay?”
Uptime screening before integration
“I need to integrate a few x402 endpoints into my workflow — fetch the x402 seller conformance list and tell me which ones have had solid 7-day uptime and are passing the protocol probe.”
Comparing x402 seller activity
“Which x402 sellers have the most payers and calls over the last 30 days? Pull the conformance roster and sort by usage so I can see which endpoints are actually getting traction.”
Technical details
Endpoint
GEThttps://www.blockchainiq.co/api/x402/v1/x402-market?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to screen or rank x402 protocol sellers before committing payments, when you want an independent daily conformance audit rather than self-reported seller metadata, or when you need a single parameterless call to get a full ranked leaderboard of live x402 endpoints with uptime and schema validity already scored.
Side effects
- Probe data over 48 hours old — endpoint returns an error or empty payload rather than stale data
- Network or server error returning a non-200 status
- Empty or truncated seller list if the daily probe has not yet completed
- Payment failure (x402 $0.02 USDC not settled) resulting in a 402 response with payment instructions
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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