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ONE PERCENT — Payment Preflight Check
x402
ONE PERCENT — Payment Preflight Check is a paid API for AI agents from one-percent-agent-tip.middletontanne137269.chatgpt.site, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).
Validates whether a target x402 payment endpoint is reachable, payment-required, and within budget before committing funds
Price / call$0.01
Success—
StatusUnknown
How this service works
Two one-cent agent tools and one free budget utility, available over ordinary HTTP.
Output
A JSON object confirming whether the target endpoint is reachable, whether it returns HTTP 402, the payment asset address, the payTo wallet address, the payment scheme (e.g. 'exact'), the network (e.g. 'eip155:8453'), the amount in USD, whether it falls within budget, whether it is safe to attempt, and any warnings — plus a checkedAt timestamp and schema version.
Example use cases
Budget guard before agent micropayment
“Before my agent spends any money, run a preflight check on that x402 tool URL to make sure it's reachable, returning a 402, and that the cost is within our $0.01 cap — I don't want to burn funds on a broken endpoint.”
Verifying payment details before integration
“I'm integrating a new x402-gated API — can you preflight it to confirm the payTo address, the asset contract, the exact amount in USD, and whether the scheme is 'exact', so I can hardcode those values safely?”
Agent safety check in automated workflow
“My automated agent is about to call a paid endpoint — first do a payment preflight to confirm it's reachable and safeToAttempt is true, and flag any warnings before we proceed.”
Technical details
Endpoint
POSThttps://one-percent-agent-tip.middletontanne137269.chatgpt.site/api/tools/payment-preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to safely preflight an x402-gated API call before committing funds — especially in automated workflows where a failed or overpriced payment would be wasteful or irreversible. Prefer this over blindly calling the target endpoint when you need to verify reachability, confirm the payTo address and asset, check that the payment scheme is 'exact', and ensure the cost is within budget, all without spending any money.
Side effects
- Target URL unreachable — reachable: false returned
- Endpoint does not return 402 — paymentRequired: false
- Cost exceeds agent budget — withinBudget: false, safeToAttempt: false
- Malformed or missing target URL in request body
- Network or asset mismatch causing warnings array to be populated
- Timeout reaching the target endpoint
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "payment-preflight",
"result": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x1111111111111111111111111111111111111111",
"scheme": "exact",
"network": "eip155:8453",
"warnings": [],
"amountUsd": "0.01",
"reachable": true,
"httpStatus": 402,
"withinBudget": true,
"safeToAttempt": true,
"paymentRequired": true
},
"source": "direct",
"warnings": [],
"checkedAt": "2026-08-08T00:00:00.000Z",
"schemaVersion": "1"
}
}Tags
x402
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