# Services from blockchain-api.x402-chain-tools.workers.dev on Zero

> blockchain-api.x402-chain-tools.workers.dev serves 9 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/blockchain-api.x402-chain-tools.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/blockchain-api.x402-chain-tools.workers.dev/health.json

## Services

- [x402 Chain Tools – ERC-20 Allowance Lookup](https://www.zero.xyz/c/x402-chain-tools-erc-20-allowance-lookup-8cd7ce8e/llms.txt): $0.001/call via x402. Returns the ERC-20 token allowance granted by an owner address to a spender address on Base Mainnet.
- [x402 Chain Tools – ERC-20 Wallet Preflight Check](https://www.zero.xyz/c/x402-chain-tools-erc-20-wallet-preflight-check-29917afa/llms.txt): $0.002/call via x402. Checks whether a Base wallet is ready to spend a specified ERC-20 token amount by validating token balance, ETH gas balance, and spender allowance in a single read-only call.
- [x402 Chain Tools – Base Mainnet Transaction Lookup](https://www.zero.xyz/c/x402-chain-tools-base-mainnet-transaction-lookup-bd81c3cf/llms.txt): $0.002/call via x402. Looks up a Base Mainnet transaction by its hash and returns on-chain transaction details including found/not-found status.
- [x402 Chain Tools – Get Base Transaction Receipt](https://www.zero.xyz/c/x402-chain-tools-get-base-transaction-receipt-2a92099f/llms.txt): $0.002/call via x402. Retrieves a Base Mainnet transaction receipt and execution status (confirmed, success, receipt) for a given transaction hash.
- [x402 Chain Tools – Get Current Base Mainnet Block Number](https://www.zero.xyz/c/x402-chain-tools-get-current-base-mainnet-block-number-65b32e20/llms.txt): $0.001/call via x402. Returns the current block number of the Base Mainnet blockchain in both decimal and hex formats.
- [x402 Chain Tools – ERC-20 Token Balance](https://www.zero.xyz/c/x402-chain-tools-erc-20-token-balance-d1d2be33/llms.txt): $0.001/call via x402. Returns the ERC-20 token balance (raw, formatted, and decimal-adjusted) for a given wallet address on Base Mainnet.
- [x402 Chain Tools – Native ETH Balance Lookup](https://www.zero.xyz/c/x402-chain-tools-native-eth-balance-lookup-6c2ce53e/llms.txt): $0.001/call via x402. Returns the native ETH balance (in both ETH and wei) of a given Base Mainnet wallet address.
- [x402 Chain Tools – Base Mainnet Transaction Lookup](https://www.zero.xyz/c/x402-chain-tools-base-mainnet-transaction-lookup-ed1168b6/llms.txt): $0.002/call via x402. Look up a Base Mainnet transaction by hash, returning sender, recipient, value, nonce, block number, gas fields, and input data.
- [x402 Chain Tools – Transaction Receipt Status](https://www.zero.xyz/c/x402-chain-tools-transaction-receipt-status-5251282c/llms.txt): $0.002/call via x402. Checks the confirmation status and receipt of a Base Mainnet transaction by its hash

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)