# Services from chain-tools.use.x402atlas.com on Zero

> chain-tools.use.x402atlas.com serves 7 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/chain-tools.use.x402atlas.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/chain-tools.use.x402atlas.com/health.json

## Services

- [Solidity ABI Calldata Decoder](https://www.zero.xyz/c/solidity-abi-calldata-decoder-d96ebc77/llms.txt): $0.005/call via x402. Decodes canonical EVM smart-contract function call data or typed ABI values, verifies selectors, and rejects ambiguous offsets or padding.
- [Solana PDA Calculator](https://www.zero.xyz/c/solana-pda-calculator-4dd1fd13/llms.txt): $0.005/call via x402. Derives the canonical Program Derived Address (PDA) and bump seed for a given Solana program and set of seeds, entirely offline without RPC or key handling.
- [Solidity ABI Calldata Encoder](https://www.zero.xyz/c/solidity-abi-calldata-encoder-6e2b8a44/llms.txt): $0.005/call via x402. Encodes canonical typed values into EVM smart-contract ABI calldata, optionally including a 4-byte function selector and exact 256-bit integers.
- [CREATE2 Deterministic Contract Address Calculator](https://www.zero.xyz/c/create2-deterministic-contract-address-calculator-71029371/llms.txt): $0.005/call via x402. Derives the EIP-1014 CREATE2 deployment address, preimage, hashes, and EIP-55 checksum for an EVM contract without requiring an RPC connection.
- [Atlas Keccak Merkle Proof Verifier](https://www.zero.xyz/c/atlas-keccak-merkle-proof-verifier-8218ecc6/llms.txt): $0.005/call via x402. Validates Keccak Merkle inclusion proofs against the Atlas sorted-pair tree profile, verifying leaf index, leaf count, and proof shape.
- [Keccak Merkle Tree and Proof Builder](https://www.zero.xyz/c/keccak-merkle-tree-and-proof-builder-a4f6496a/llms.txt): $0.01/call via x402. Builds a Keccak-based Merkle tree from a list of leaves and returns indexed sorted-pair inclusion proofs with domain separation and odd-node promotion.
- [EVM Address Checksum & Validation Tool](https://www.zero.xyz/c/evm-address-checksum-validation-tool-a0ed6f0a/llms.txt): $0.005/call via x402. Normalizes an Ethereum-compatible address to its EIP-55 mixed-case checksum form and validates whether a given address passes checksum verification, entirely offline.

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)