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x402 Trust Layer Buy Advisor
x402
x402 Trust Layer Buy Advisor is a paid API for AI agents from x402trustlayer.xyz, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-28).
Evaluates an API purchase intent against policy limits and returns ranked quotes with a recommended provider, cost, and action for x402-paid API calls
Price / call$0.08
Success—
StatusUnknown
How this service works
68 paid x402 trust infrastructure APIs: guard, semantic escrow, mandate diff, certified seller network, KYM, mandates, compliance, disputes, and orchestration.
Output
Returns a policy evaluation (allowed/denied with summary), ranked quotes from available providers with all-in USDC cost, and a top recommendation including the endpoint URL, network (e.g. eip155:8453), required action (e.g. pay_external), confidence score, rationale, and total cost in USDC.
Example use cases
Verify compliance before executing payment
“I'm about to pay for a custody audit API call — can you make sure it fits within my remaining daily budget and show me which provider on mainnet would be most cost-effective?”
Compare multi-provider pricing for KYM verification
“We need to verify customer identity across different KYM providers — can you pull ranked quotes for all available x402 KYM APIs and tell me which one gives us the best all-in price on Polygon?”
Find recommended API for dispute resolution
“Our platform needs to handle a dispute between buyer and seller using x402 infrastructure — what's the top-rated and cheapest dispute resolution API I should call, and what's the total USDC cost?”
Technical details
Endpoint
POSThttps://x402trustlayer.xyz/api/market/buy-advisor?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to decide which x402-compatible API to call for a given intent before committing to a micropayment — especially when policy compliance (daily/per-call spend limits) must be checked first, or when multiple competing providers exist and cost comparison is needed. Prefer over direct API calls when the agent doesn't already know the best provider or network for a capability.
Side effects
- Policy disallowed: returns allowed=false with a policy summary explaining limit exceeded
- No matching providers: quotes array empty, recommendation may be absent
- Invalid HTTP method supplied (only GET, HEAD, DELETE allowed): schema validation error
- Service unavailable: non-200 response with ok=false
- Low confidence recommendation: confidence score below threshold with weak rationale
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"intent": "ETH USD spot price oracle",
"policy": {
"allowed": true,
"summary": "Within daily and per-call limits",
"evaluated": true
},
"quotes": [
{
"name": "Example API",
"rank": 1,
"allInCostUsdc": 0.05,
"requiresPayment": true
}
],
"status": "ok",
"allowed": true,
"summary": "Best catalog match: Mycelia ETH/USD Oracle at ~$0.05 on eip155:8453.",
"checkedAt": "1970-01-01T00:00:00.000Z",
"recommendation": {
"url": "https://api.example.com/oracle/eth/usd",
"action": "pay_external",
"network": "eip155:8453",
"rationale": "Best catalog match within policy caps",
"confidence": 0.85,
"allInCostUsdc": 0.05
}
}
}Tags
x402
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