# x402helper.xyz Test Billing Verifier

> x402helper.xyz Test Billing Verifier is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Verifies x402 payment proofs for test billing scenarios on Base and Solana networks.

## Facts

- Endpoint: POST https://x402helper.xyz/test-billing
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402helper-xyz-61d160c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8sS6vRaFFAZBL7Ri9Tie1

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 x402helper-xyz-61d160c8 -d '<json body>'
```

Example prompt: Verify this x402 payment proof for a test billing call — the payment was made in USDC on Base network and I need to confirm it's valid before proceeding.

## When to prefer this

Use this endpoint when you need to verify x402 payment proofs specifically for test billing on Base or Solana networks. Ideal for developers testing x402 payment flows before production deployment or for agents that need to confirm micropayment receipts as part of a pay-per-call API access pattern.

## Known failure modes

- Invalid or malformed payment proof returns verification failure
- Unsupported network (not Base or Solana) returns error
- Expired payment proof returns invalid status
- Duplicate payment proof rejected to prevent replay attacks
- Insufficient USDC amount returns payment validation failure

## How this service works

x402 micropayments demo server. AI agents pay 0.001 USDC for billing verification.

## Output

Returns a verification result indicating whether the submitted x402 payment proof is valid, along with billing confirmation status for the test transaction on the specified blockchain network (Base or Solana).

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402helper-xyz-61d160c8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)