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x402 Market Buy Advisor
x402
x402 Market Buy Advisor is a paid API for AI agents from x402-agent-suite-production.up.railway.app, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-14).
Evaluates a planned API purchase request and returns ranked quotes plus a buy/skip recommendation with confidence score for AI agents spending USDC on x402 markets.
Price / call$0.08
Success—
StatusUnknown
How this service works
24 paid x402 infrastructure APIs for AI agent fleets: buy advisor, audition coach, guard, proxy, MPP, attestations, and pipeline orchestration.
Output
Returns a JSON object with: a list of ranked quotes (provider name, rank, all-in cost in USDC, whether payment is required), a top recommendation (action like 'pay_external', URL, network, all-in cost, confidence score 0–1, rationale), a policy evaluation (allowed boolean, summary), and a status/summary string with a checkedAt timestamp.
Example use cases
Example prompt
“Before my agent pays for that x402 GET call to the weather endpoint, check the buy advisor — get me ranked quotes and tell me if it should pay or skip, including the all-in USDC cost and confidence level.”
Technical details
Endpoint
POSThttps://x402-agent-suite-production.up.railway.app/api/market/buy-advisorWhen to prefer
Use this endpoint when an AI agent needs to make a cost-aware purchasing decision before executing a paid x402 API call — particularly when comparing multiple providers, enforcing spend policies, or maximizing confidence that the payment is justified. Prefer over blind payment when budget management or policy compliance matters.
Side effects
- Missing required 'input.type' or 'input.method' fields returns validation error
- Unsupported HTTP method (POST/PUT/PATCH) rejected by enum constraint
- No quotes available if target endpoint is unreachable or not listed on x402 markets
- Payment of $0.08 USDC required before response is returned; missing payment returns 402
- Low confidence recommendation if market data is sparse or stale
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"quotes": [
{
"name": "Example API",
"rank": 1,
"allInCostUsdc": 0.05
}
],
"recommendation": {
"action": "pay_external",
"confidence": 0.85
}
}
}Tags
x402
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