# x402 Preflight Verifier

> x402 Preflight Verifier is a paid API for AI agents from bj7e26lfpo4fthvr35hczdipby.srv.us, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Verifies an x402-gated HTTPS endpoint before payment: checks liveness, confirms the 402 response, parses payment terms, and reports whether the actual price matches your expected price.

## Facts

- Endpoint: GET https://bj7e26lfpo4fthvr35hczdipby.srv.us/v1/x402-preflight
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-preflight-verifier-d4fd696f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__A47D6m23TRDNtLvlhCeg

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 x402-preflight-verifier-d4fd696f
```

Example prompt: Before my agent pays it, can you preflight-check this x402 endpoint — https://api.govparse.io/v1/fcc/licenses/search — and confirm it's live, returns a 402, and actually charges 1.25 USDC like the catalog says?

## When to prefer this

Use this endpoint when your agent needs a zero-cost, account-free preflight check before committing a micropayment to an x402-gated API. It is the right choice when you want to confirm liveness, validate payment terms (address, network, asset), and detect price drift before automating payments — especially for untrusted or newly discovered x402 endpoints. Prefer it over direct payment attempts when the cost of a mistaken payment or a call to a dead endpoint exceeds $0.02 USDC.

## Known failure modes

- Endpoint is unreachable — verdict will reflect failed reachability and safe_to_pay will be false
- Endpoint does not return 402 — verdict will indicate it is not a live x402 endpoint
- Price drift detected — price_matches_expected will be false if actual price differs from expected_usdc
- Malformed or missing payment headers on the target endpoint — terms array may be empty or parsing may fail
- Invalid URL supplied — endpoint will return a validation error
- Target endpoint intermittently live — results may vary between calls if upstream is flaky

## How this service works

Seven account-free paid tools for source integrity, x402 catalog search, preflight, liveness, routing, price drift, and batch verification.

## Output

Returns a JSON object with: the verdict label (e.g. 'live_paid'), whether the endpoint is reachable, the HTTP status code observed, parsed payment terms (asset contract, pay-to address, network chain ID, amount), the price in USDC, whether the actual price matches the expected price you supplied, and a safe_to_pay boolean — giving the agent a clear go/no-go before executing payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "HTTPS x402 endpoint to verify before paying it"
      },
      "expected_usdc": {
       "type": "string",
       "description": "Price you believe it charges; drift is reported"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://api.govparse.io/v1/fcc/licenses/search",
  "terms": [
   {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "pay_to": "0x...",
    "network": "eip155:8453",
    "amount_usdc": 1.25
   }
  ],
  "verdict": "live_paid",
  "reachable": true,
  "price_usdc": 1.25,
  "http_status": 402,
  "safe_to_pay": true,
  "expected_usdc": 1.25,
  "preflightVersion": "1.0",
  "price_matches_expected": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-preflight-verifier-d4fd696f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bj7e26lfpo4fthvr35hczdipby.srv.us](https://www.zero.xyz/host/bj7e26lfpo4fthvr35hczdipby.srv.us/llms.txt)