# x402 TX Preflight Diagnostic

> x402 TX Preflight Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-02).

Runs a paid transaction preflight diagnostic check via the x402 payment protocol, returning structured diagnostic data for EIP-3009 payment flows

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/txpreflight?utm_source=zero.xyz
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tx-preflight-diagnostic-49f9d266
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V5gubYQkv71uETUZGwvNH

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-tx-preflight-diagnostic-49f9d266
```

Example prompt: Run an x402 TX preflight diagnostic on my payment setup — I want to confirm my EIP-3009 USDC authorization is correctly configured before I send a real transaction.

## When to prefer this

Choose this endpoint when you need to validate or debug an x402/EIP-3009 payment integration specifically using the OpenX402 facilitator. It is ideal for testing that your USDC micropayment authorization headers are correctly formed before committing to a real transaction. Not suitable for non-x402 payment systems or general API health checks.

## Known failure modes

- HTTP 402 returned when no valid x402 payment is attached — response includes EIP-3009 payment extras needed to authorize
- Invalid or malformed payment token causes authorization failure
- OpenX402 facilitator unavailable causes service errors
- Incorrect properties parameter format may yield unexpected results

## How this service works

Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.

## Output

Returns a JSON object containing the SKU name ('txpreflight'), a human-readable note clarifying this is a diagnostic (not a live settlement), the price ($0.04), and a title ('TX Preflight'). Unpaid requests receive an HTTP 402 response with EIP-3009 payment extras required for authorization.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "txpreflight",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.04",
  "title": "TX Preflight"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tx-preflight-diagnostic-49f9d266/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from openclawproductions.com](https://www.zero.xyz/host/openclawproductions.com/llms.txt)