# Services from x402.halowerk.com on Zero

> x402.halowerk.com serves 11 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/x402.halowerk.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/x402.halowerk.com/health.json

## Services

- [x402 Payment Channel Voucher Auditor](https://www.zero.xyz/c/x402-payment-channel-voucher-auditor-20c1a06d/llms.txt): $0.006/call via x402. Cryptographically audits vouchers in a payment channel by verifying signatures and detecting double-spending, without redeeming or modifying any state.
- [HALOWERK x402werk — Offer Validate](https://www.zero.xyz/c/halowerk-x402werk-offer-validate-fc202555/llms.txt): $0.002/call via x402. Validates an x402 payment challenge object (v1 or v2) by fetching and parsing it from a URL or directly from a provided challenge object, returning detailed conformance results.
- [HALOWERK x402werk Policy Check](https://www.zero.xyz/c/halowerk-x402werk-policy-check-4f70d57c/llms.txt): $0.002/call via x402. Stateless rule-based validation of a proposed x402 payment against a caller-supplied spending policy and running totals, returning per-rule verdicts without storing any state.
- [HALOWERK x402werk — Replay Guard (Duplicate Payment Detector)](https://www.zero.xyz/c/halowerk-x402werk-replay-guard-duplicate-payment-detector-16eedb2b/llms.txt): $0.002/call via x402. Checks whether an x402 payment nonce, payment ID, or payload hash has been seen before, returning a duplicate-detection recommendation to accept, reject, or review the payment.
- [HALOWERK x402werk ERC-20 Transfer Reconciliation](https://www.zero.xyz/c/halowerk-x402werk-erc-20-transfer-reconciliation-b93433ba/llms.txt): $0.008/call via x402. Reconciles a list of expected payment receipts against actual on-chain ERC-20 transfers received at a given address within a specified block or time window, using tx hash or amount+payer+time matching.
- [HALOWERK x402werk Offer Parser](https://www.zero.xyz/c/halowerk-x402werk-offer-parser-2d0ed2d0/llms.txt): $0.002/call via x402. Fetches and parses an x402 HTTP 402 payment challenge from a URL or raw challenge object, returning structured payment requirements including asset, network, amount, and recipient details.
- [HALOWERK x402werk Receipt Verifier](https://www.zero.xyz/c/halowerk-x402werk-receipt-verifier-a21539f2/llms.txt): $0.003/call via x402. Verifies a signed x402 payment offer and optional receipt, checking signature validity, field matching, and timestamp plausibility
- [x402 Payment Route Optimizer](https://www.zero.xyz/c/x402-payment-route-optimizer-01253e3f/llms.txt): $0.005/call via x402. Determines which token/chain combinations a buyer holds can settle a given payment amount to a seller, computing all-in USD costs including gas, swap, and bridge fees, with explicit route classification.
- [x402 Facilitator Health & Capability Probe](https://www.zero.xyz/c/x402-facilitator-health-capability-probe-06d6af3e/llms.txt): $0.003/call via x402. Queries all known x402 facilitators live to report their supported chains, assets, and payment schemes, plus current response latency — without any historical series data.
- [HALOWERK x402werk Benchmark Price](https://www.zero.xyz/c/halowerk-x402werk-benchmark-price-c92a7af8/llms.txt): $0.006/call via x402. Benchmarks the price of an x402 paid endpoint against comparable offers in the catalog, returning percentile pricing and market position.
- [HALOWERK x402werk Settlement Verifier](https://www.zero.xyz/c/halowerk-x402werk-settlement-verifier-125fd8fd/llms.txt): $0.002/call via x402. Verifies an on-chain settlement transaction against expected payment parameters on Base Mainnet, returning a verdict on confirmation, amount, asset, and recipient matching.

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

- [Zero catalog index](https://www.zero.xyz/llms.txt)