# Services from web3-tools.x402tookit.com on Zero

> web3-tools.x402tookit.com serves 12 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/web3-tools.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/web3-tools.x402tookit.com/health.json

## Services

- [Web3 Tools Unit Converter](https://www.zero.xyz/c/web3-tools-unit-converter-15155552/llms.txt): $0.02/call via x402. Converts crypto amounts between units: wei, gwei, ether (EVM), lamports, SOL, satoshis, BTC, or custom token decimals
- [Web3 Tools Keccak-256 Hash](https://www.zero.xyz/c/web3-tools-keccak-256-hash-c4d80fc7/llms.txt): $0.02/call via x402. Computes the Keccak-256 hash of text or hex bytes, returning the hash, the first 4 bytes (function selector), and NIST SHA3-256 for comparison.
- [Web3 Tools – EVM Address EIP-55 Checksum Validator](https://www.zero.xyz/c/web3-tools-evm-address-eip-55-checksum-validator-a5817bbd/llms.txt): $0.02/call via x402. Validates an EVM address against its EIP-55 checksum and returns the correctly checksummed form along with a verdict.
- [Bitcoin Address Validator](https://www.zero.xyz/c/bitcoin-address-validator-44e20d82/llms.txt): $0.02/call via x402. Validates a Bitcoin address (legacy, P2SH, SegWit bech32, Taproot bech32m) checking checksum, type, network, and hash payload.
- [Web3 Tools Hex Converter](https://www.zero.xyz/c/web3-tools-hex-converter-78aab2c8/llms.txt): $0.02/call via x402. Converts between hex strings, UTF-8 text, and signed/unsigned integers with 32-byte padding for EVM/blockchain data handling.
- [Web3 Tools – Solidity Function Selector & Event Topic0 Computer](https://www.zero.xyz/c/web3-tools-solidity-function-selector-event-topic0-computer-c16c9daa/llms.txt): $0.02/call via x402. Computes the 4-byte function selector and 32-byte event topic0 from a canonical Solidity signature string
- [Web3 Tools CAIP ID Parser](https://www.zero.xyz/c/web3-tools-caip-id-parser-85f674a4/llms.txt): $0.02/call via x402. Parses and validates CAIP-2 chain IDs, CAIP-10 account IDs, and CAIP-19 asset IDs, returning namespace, reference, known chain name, and address details.
- [Web3 Tools ENS Namehash](https://www.zero.xyz/c/web3-tools-ens-namehash-c066f12f/llms.txt): $0.02/call via x402. Computes the EIP-137 ENS namehash and per-label keccak256 label hashes for a given ENS name, ready for use in contract calls and subgraph queries.
- [Web3 Tools - Contract Address Predictor (CREATE / CREATE2)](https://www.zero.xyz/c/web3-tools-contract-address-predictor-create-create2-63160e6a/llms.txt): $0.02/call via x402. Predicts the Ethereum contract address that will be deployed using either CREATE (deployer + nonce) or CREATE2 (deployer + salt + init code or its hash).
- [Web3 Tools – Transaction Hash / TXID / Signature Format Checker](https://www.zero.xyz/c/web3-tools-transaction-hash-txid-signature-format-checker-bee7b105/llms.txt): $0.02/call via x402. Validates whether a given string is a well-formed transaction identifier (EVM hash, Bitcoin txid, or Solana signature) and flags any formatting typos or errors.
- [Web3 Tools – EVM Calldata Splitter](https://www.zero.xyz/c/web3-tools-evm-calldata-splitter-03b4a1e9/llms.txt): $0.02/call via x402. Splits raw EVM calldata into its 4-byte function selector and 32-byte argument words, identifies known ERC-20/ERC-721 function signatures, and flags embedded Ethereum addresses.
- [Web3 Tools – Solana Address Validator](https://www.zero.xyz/c/web3-tools-solana-address-validator-73d9fa39/llms.txt): $0.02/call via x402. Validates a Solana public key: checks base58 encoding, byte length (32 bytes), and whether it lies on the ed25519 curve (wallet address) or off it (program-derived address).

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

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