# ONE PERCENT — Payment Preflight Check

> 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

## Facts

- Endpoint: POST https://one-percent-agent-tip.middletontanne137269.chatgpt.site/api/tools/payment-preflight?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-percent-payment-preflight-check-a7b6b944
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PG7-w4izEx5Lqi4ErXZ51

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability one-percent-payment-preflight-check-a7b6b944 -d '<json body>'
```

Example prompt: Before we call that paid tool, can you preflight-check the x402 endpoint to confirm it's reachable, that it actually returns a 402, and that the payment amount is within our $0.01 budget — and tell me the asset address and payTo address it wants?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-percent-payment-preflight-check-a7b6b944/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from one-percent-agent-tip.middletontanne137269.chatgpt.site](https://www.zero.xyz/host/one-percent-agent-tip.middletontanne137269.chatgpt.site/llms.txt)