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x402 API Router (facts402 Recommend)
x402
x402 API Router (facts402 Recommend) is a paid API for AI agents from api.facts402.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-02).
Given a plain-English task description, returns the top-k ranked paid x402 API endpoints from the x402-list.com catalog, scored by relevance, on-chain buyer count, recency, and live liveness probing.
Price / call$0.005
Success—
StatusUnknown
How this service works
Use when an agent must find which x402 API to call: takes need (the task in words) and returns the top-k paid endpoints (url, method, price, network, 30-day on-chain buyers, live-402 probe, risk flags, score) ranked over the x402-list.com catalog (CC BY 4.0) and sellers' own 402s. Own listings use the same formula. No match = 404. $0.005 USDC on Base; charged only on 2xx, never for invalid input.
Output
An ordered list of up to k x402 API endpoint records, each containing: endpoint URL, HTTP method, price per call, payment network, 30-day on-chain buyer count, live 402 probe result, risk flags, and a composite relevance score. Returns 404 with no charge if no match is found.
Example use cases
Finding a sanctions-screening API
“I need to screen a company name against OFAC — find me the top 5 paid x402 APIs for sanctions or watchlist screening, ranked by how many buyers they have, and keep it under $0.05 per call.”
Choosing cheapest email-check endpoint
“Can you look up which x402 APIs are available for email address validation, max price $0.01, and give me the top 2 options with their liveness status and buyer counts?”
Discovering APIs for an autonomous agent
“My agent needs to do web search — search the x402 catalog for the best paid endpoints for web search, return the top 5 ranked by relevance and on-chain popularity, on any network.”
Technical details
Endpoint
GEThttps://api.facts402.com/v1/recommend?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to dynamically discover which paid x402 API to call for a given task, especially when the agent doesn't know the specific endpoint URL in advance. Prefer this over static API registries when you need live liveness probes, on-chain buyer signals, and price filtering to select the best option at runtime.
Side effects
- 404 returned when no catalog entry matches the need query — not charged
- Invalid k value (must be 1-10) causes validation error
- max_price filter too low may exclude all results, returning empty or 404
- Network filter (CAIP-2) with no matching endpoints yields no results
- Malformed need parameter (too short or too long) rejected by schema
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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