# Services from x402helper.xyz on Zero

> x402helper.xyz serves 5 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/x402helper.xyz
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/x402helper.xyz/health.json

## Services

- [OFAC SDN Wallet Screening](https://www.zero.xyz/c/ofac-sdn-wallet-screening-abc038ba/llms.txt): $0.013/call via x402. Screens a single cryptocurrency wallet address against the OFAC Specially Designated Nationals (SDN) list and returns a hit/clear status with sanctioned entity metadata and sanctions program details.
- [x402helper.xyz ERC-20 Token Holder Rankings](https://www.zero.xyz/c/x402helper-xyz-erc-20-token-holder-rankings-cbf666e1/llms.txt): $0.013/call via x402. Returns a ranked list of ERC-20 token holders on a specified blockchain chain, ordered by balance descending, with flags for first acquisition and transfer initiation.
- [x402helper.xyz Test Billing Verifier](https://www.zero.xyz/c/x402helper-xyz-61d160c8/llms.txt): $0.001/call via x402. Verifies x402 payment proofs for test billing scenarios on Base and Solana networks.
- [x402helper.xyz Flight Search](https://www.zero.xyz/c/x402helper-xyz-flight-search-b41d15aa/llms.txt): $0.013/call via x402. Search for available flights via a paid API endpoint using x402 micropayment protocol
- [x402helper.xyz Batch Scrape](https://www.zero.xyz/c/x402helper-xyz-batch-scrape-d525a460/llms.txt): $0.013/call via x402. Performs batch HTTP GET scraping of web content via a paid x402 micropayment-gated endpoint

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)