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x402 Resource Preflight Check
x402
x402 Resource Preflight Check is a paid API for AI agents from xx402.icu, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Probes a public x402-gated URL without payment to inspect its payment terms, validate budget fit, and return a buyer retry plan before committing funds.
Price / call$0.01
Success—
StatusDown
How this service works
Paid x402 buyer market scout, x402 paid resource preflight, x402 seller visibility audit, Base actionable risk feed, liquidity exit risk alerts, pool launch risk feed, stable asset risk feed, contract control event feed, protocol outflow risk feed, yield pool allocation risk feed, protocol fee quality feed, token watchlist decision packet, wallet watchlist decision packet, approval risk feed, ranked DeFi review queues with incident history, onchain risk decision packet, promoted token campaign decision packet, large transfer decision packet, token candidate screening decision radar, DEX pair anomaly decision radar, wallet safety decision packet, counterparty flow, allowance, approval exposure, DEX pair routing risk, token trade safety, token liquidity, token flow, holder concentration, contract controls, batch token screening decision packets, token diligence, and BTC15 prediction-market microstructure, execution-friction, calibration-slice, recent market tape, resolved feature sample, and threshold-pressure packets for agents and risk tools.
Output
Returns a JSON object containing a summary, preflight decision (go/no-go), full payment terms extracted from the 402 challenge, resource metadata, a budget check comparing the resource price to the caller's max price, a buyer retry plan with actionable next steps, and source status details.
Example use cases
Budget check before DeFi data purchase
“Check whether this x402 resource at https://x402.xx402.icu/api/token-diligence?token=virtual is payable for under $0.02 USDC on Base mainnet with USDC, and give me a retry plan if it's not.”
Validate Bazaar metadata on a new x402 endpoint
“Probe this x402 URL — https://x402.xx402.icu/api/stable-asset-risk-feed — and flag it if it's missing Bazaar schema metadata. I want the full preflight summary and payment terms.”
Verify asset and network match before payment
“Run a preflight on https://x402.xx402.icu/api/yield-pool-allocation-risk-feed and confirm it expects USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on the Base mainnet network eip155:8453 — I need to know before my agent tries to pay.”
Technical details
Endpoint
GEThttps://xx402.icu/x402/api/x402-resource-preflightWhen to prefer
Use this endpoint when an AI agent needs to inspect an x402-gated resource before committing a payment — especially to verify price, asset, network compatibility, and Bazaar metadata presence without spending any funds. Prefer this over direct payment when budget validation or retry planning is needed first.
Side effects
- Target URL is private, local, or credentialed — blocked by policy
- Target URL does not return a 402 Payment Required response
- max_price_usdc below the minimum threshold of $0.001
- Payment asset or network mismatch between expected and actual terms
- Target URL is unreachable or returns a non-HTTP error
- require_bazaar_metadata flag causes rejection when Bazaar extension is absent
Output
Schema · Response
{
"keys": [
"summary",
"preflight_decision",
"payment_terms",
"resource_metadata",
"budget_check",
"buyer_retry_plan",
"source_status",
"sources"
],
"type": "json"
}Tags
x402
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