# Services from skills.onesource.io on Zero

> skills.onesource.io serves 45 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/skills.onesource.io
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/skills.onesource.io/health.json

## Services

- [OneSource Live Wallet Balance](https://www.zero.xyz/c/skills-onesource-io-d33e3f6b/llms.txt): $0.003/call via x402, rated 5.0/5 (1 review). Fetches live ETH balance and ERC20 token balances for an Ethereum-compatible wallet address in a single call
- [OneSource ERC20 Token Balance Lookup](https://www.zero.xyz/c/skills-onesource-io-56ffd389/llms.txt): $0.003/call via x402. Fetches the ERC20 token balance (name, symbol, decimals, raw balance) for any Ethereum wallet address on multiple chains via live RPC eth_call
- [skills.onesource.io ENS Resolver](https://www.zero.xyz/c/skills-onesource-io-3a638ace/llms.txt): $0.005000/call via x402. Resolves a .eth ENS name to its Ethereum address (and resolver info), or resolves an Ethereum address to its primary .eth name, via eth_call on a live Ethereum RPC.
- [skills.onesource.io Smart Contract Details](https://www.zero.xyz/c/skills-onesource-io-393c4eae/llms.txt): $0.005000/call via x402. Returns on-chain details for a specific smart contract address, including token standards (ERC-20, ERC-721, ERC-1155), interfaces, and bytecode size.
- [OneSource ENS Resolver](https://www.zero.xyz/c/skills-onesource-io-6ae0d9aa/llms.txt): $0.005000/call via x402. Resolves an ENS .eth name to an Ethereum address, or reverse-resolves an Ethereum address to its primary .eth name, via live eth_call on multiple networks
- [skills.onesource.io Ethereum Proxy Pattern Detector](https://www.zero.xyz/c/skills-onesource-io-95ea7e2b/llms.txt): $0.005000/call via x402. Detects whether an Ethereum address is a proxy contract and identifies its pattern (EIP-1967, UUPS, Transparent/slot0) along with the implementation address
- [skills.onesource.io Ethereum Transaction Receipt](https://www.zero.xyz/c/skills-onesource-io-04434fab/llms.txt): $0.005/call via x402. Fetches the mined transaction receipt for a given Ethereum transaction hash, including status, gas used, and emitted event logs
- [OneSource NFT Metadata Lookup](https://www.zero.xyz/c/skills-onesource-io-a94bdef9/llms.txt): $0.008/call via x402. Fetches NFT metadata, traits, and image URI for any ERC721 or ERC1155 token by contract address and token ID via live Ethereum RPC with IPFS resolution
- [ERC20 Transfer Logs Decoder](https://www.zero.xyz/c/skills-onesource-io-924686a9/llms.txt): $0.005/call via x402. Fetches and decodes ERC20 Transfer event logs via eth_getLogs, returning sender, recipient, and amount for a given token contract or wallet address across multiple EVM networks
- [Ethereum Raw Storage Slot Reader (eth_getStorageAt)](https://www.zero.xyz/c/skills-onesource-io-75222683/llms.txt): $0.005/call via x402. Reads a raw 32-byte storage slot from any Ethereum-compatible smart contract at a given block using eth_getStorageAt
- [Ethereum Pending Block (Mempool) Fetcher](https://www.zero.xyz/c/skills-onesource-io-f2b6b131/llms.txt): $0.01/call via x402. Returns the pending Ethereum block containing mempool transactions not yet mined, using eth_getBlockByNumber('pending'), across multiple EVM-compatible networks
- [Ethereum Chain ID Lookup (EIP-155)](https://www.zero.xyz/c/skills-onesource-io-286637b6/llms.txt): $0.001/call via x402. Returns the EIP-155 chain ID for a specified Ethereum-compatible network via eth_chainId
- [ERC20 Allowance Lookup (eth_call)](https://www.zero.xyz/c/skills-onesource-io-9035b699/llms.txt): $0.003/call via x402. Returns the current ERC20 token allowance — how many tokens a spender is approved to transfer from an owner's wallet — via live eth_call on supported networks.
- [skills.onesource.io Wallet Nonce Lookup](https://www.zero.xyz/c/skills-onesource-io-aa670e7b/llms.txt): $0.003000/call via x402. Fetches the current on-chain transaction nonce for a given Ethereum-compatible wallet address at a specified block.
- [Ethereum eth_call Simulator (skills.onesource.io)](https://www.zero.xyz/c/skills-onesource-io-4a1c9f57/llms.txt): $0.005000/call via x402. Simulates a read-only Ethereum smart contract call via eth_call without sending a transaction to the chain
- [Ethereum Network Info (Batched RPC)](https://www.zero.xyz/c/skills-onesource-io-a295ba1b/llms.txt): $0.001/call via x402. Returns Ethereum network metadata — chain ID, block height, and gas price — in a single batched RPC call for a given network.
- [skills.onesource.io Ethereum Block by Number](https://www.zero.xyz/c/skills-onesource-io-e6979870/llms.txt): $0.003/call via x402. Fetches an Ethereum block header and its transaction hashes by block number, tag, or hex string using eth_getBlockByNumber
- [ENS Name Resolution via OneSource Ethereum RPC](https://www.zero.xyz/c/skills-onesource-io-d4ac121e/llms.txt): $0.005/call via x402. Bidirectionally resolves ENS names to Ethereum addresses and Ethereum addresses to their primary ENS names using live eth_call on supported networks
- [OneSource Ethereum Transaction Lookup by Hash](https://www.zero.xyz/c/skills-onesource-io-52887840/llms.txt): $0.008/call via x402. Fetches full Ethereum transaction details (from, to, value, calldata, block) for a given transaction hash using eth_getTransactionByHash
- [ENS Address Resolver (skills.onesource.io)](https://www.zero.xyz/c/skills-onesource-io-e47a8d69/llms.txt): $0.005/call via x402. Resolves an Ethereum address to its ENS primary name, or an ENS name to its address, along with chain-related metadata.
- [OneSource Chain Transaction Receipt Lookup](https://www.zero.xyz/c/skills-onesource-io-d661d0b5/llms.txt): $0.005000/call via x402. Fetches the on-chain transaction receipt for a given blockchain transaction hash, returning status, gas usage, block details, and sender/receiver addresses.
- [skills.onesource.io Ethereum Transaction Lookup](https://www.zero.xyz/c/skills-onesource-io-6ec27de4/llms.txt): $0.008000/call via x402. Fetches on-chain transaction details and receipt data for a given transaction hash on Ethereum mainnet, returning decoded metadata, block info, and execution receipt fields.
- [skills.onesource.io Contract Introspection](https://www.zero.xyz/c/skills-onesource-io-8e09fc01/llms.txt): $0.005/call via x402. Inspects a smart contract address on-chain via eth_call to return its name, symbol, decimals, and ERC20/721/1155 interface support flags
- [Ethereum Block Number (eth_blockNumber)](https://www.zero.xyz/c/skills-onesource-io-74da81ee/llms.txt): $0.001/call via x402. Returns the latest Ethereum block height (chain tip) for a specified network via eth_blockNumber
- [ERC1155 Token Balance Checker](https://www.zero.xyz/c/skills-onesource-io-5a52cfdd/llms.txt): $0.003/call via x402. Returns how many copies of a specific ERC1155 token ID a wallet address holds, via eth_call on supported EVM chains
- [skills.onesource.io Blockchain Contract Bytecode Fetcher](https://www.zero.xyz/c/skills-onesource-io-5fd9cf90/llms.txt): $0.003000/call via x402. Returns the on-chain bytecode (EVM code) deployed at a given smart contract address on a specified blockchain network.
- [OneSource Ethereum Block by Number](https://www.zero.xyz/c/skills-onesource-io-0c75abac/llms.txt): $0.003/call via x402. Fetches an Ethereum block header and transaction hashes by block number, tag (latest/pending/earliest), or hex value via eth_getBlockByNumber
- [OneSource ENS Resolver](https://www.zero.xyz/c/skills-onesource-io-18580f33/llms.txt): $0.005000/call via x402. Resolves a .eth name to its Ethereum address or an Ethereum address to its primary .eth name via live on-chain eth_call
- [OneSource Token Total Supply](https://www.zero.xyz/c/skills-onesource-io-a60a0039/llms.txt): $0.003/call via x402. Returns the total supply of an ERC20 or ERC721 token contract by calling totalSupply on-chain via eth_call
- [NFT Owner Lookup by Token ID (ERC721)](https://www.zero.xyz/c/skills-onesource-io-a0427b34/llms.txt): $0.003000/call via x402. Returns the current on-chain owner address of a specific ERC721 NFT by querying ownerOf via eth_call
- [skills.onesource.io – eth_getTransactionByHash](https://www.zero.xyz/c/skills-onesource-io-318c45ed/llms.txt): $0.008000/call via x402. Fetches full on-chain transaction details for a given Ethereum transaction hash via eth_getTransactionByHash
- [OneSource Ethereum Transaction Receipt Lookup](https://www.zero.xyz/c/skills-onesource-io-3fc91bb1/llms.txt): $0.005000/call via x402. Fetches the on-chain transaction receipt for a given transaction hash using eth_getTransactionReceipt, returning status, gas used, logs, and block info.
- [OneSource ENS Resolver](https://www.zero.xyz/c/skills-onesource-io-1fa8ff61/llms.txt): $0.005000/call via x402. Resolves a .eth ENS name to its Ethereum address, or an Ethereum address to its primary .eth ENS name, via live eth_call on multiple networks
- [Blockchain Transaction Receipt Lookup](https://www.zero.xyz/c/skills-onesource-io-593b3274/llms.txt): $0.005000/call via x402. Retrieves the full receipt for a blockchain transaction by hash, including status, gas usage, block info, and execution metadata across multiple networks.
- [ERC721 Token List by Owner (skills.onesource.io)](https://www.zero.xyz/c/skills-onesource-io-804bc89d/llms.txt): $0.008/call via x402. Lists all ERC721 NFT token IDs owned by a wallet address within a specific collection using tokenOfOwnerByIndex via eth_call
- [skills.onesource.io Blockchain Transaction Lookup](https://www.zero.xyz/c/skills-onesource-io-7a610cd4/llms.txt): $0.008000/call via x402. Retrieves full details for a specific blockchain transaction by its hash, including receipt, status, gas usage, and block info.
- [skills.onesource.io Ethereum Block by Number](https://www.zero.xyz/c/skills-onesource-io-f5effde3/llms.txt): $0.003/call via x402. Fetch an Ethereum block header and transaction hashes for a given block number, tag, or hex value via eth_getBlockByNumber
- [skills.onesource.io Ethereum Block Header Fetch](https://www.zero.xyz/c/skills-onesource-io-05c80844/llms.txt): $0.003/call via x402. Fetches an Ethereum block header and its transaction hashes by block number, tag, or hex value via eth_getBlockByNumber
- [skills.onesource.io ENS Forward Resolver](https://www.zero.xyz/c/skills-onesource-io-67870069/llms.txt): $0.005000/call via x402. Resolves an ENS name (e.g. vitalik.eth) to its Ethereum address and on-chain metadata across multiple networks
- [skills.onesource.io On-Chain Contract Details](https://www.zero.xyz/c/skills-onesource-io-09e4f88c/llms.txt): $0.005000/call via x402. Fetches on-chain smart contract metadata and details for a given contract address on supported EVM networks.
- [skills.onesource.io Proxy Pattern Detector](https://www.zero.xyz/c/skills-onesource-io-75006580/llms.txt): $0.005/call via x402. Detects upgradeable proxy patterns (EIP-1967, UUPS, Transparent) for a given Ethereum address and returns the implementation contract address behind the proxy
- [Ethereum Wallet Transaction Nonce Lookup](https://www.zero.xyz/c/skills-onesource-io-0a918a11/llms.txt): $0.003/call via x402. Returns the next transaction nonce (eth_getTransactionCount) for any Ethereum-compatible wallet address at a given block
- [OneSource eth_getCode Contract Checker](https://www.zero.xyz/c/skills-onesource-io-743fdbe0/llms.txt): $0.003/call via x402. Checks whether an Ethereum address is a smart contract by retrieving its deployed bytecode via eth_getCode on multiple EVM networks
- [skills.onesource.io Gas Estimator](https://www.zero.xyz/c/skills-onesource-io-1296d0a9/llms.txt): $0.004000/call via x402. Estimates the gas a transaction will consume on Ethereum via eth_estimateGas before it is signed or broadcast
- [OneSource Chain Events — eth_getLogs Query](https://www.zero.xyz/c/skills-onesource-io-ca624841/llms.txt): $0.005000/call via x402. Queries Ethereum-compatible contract event logs using eth_getLogs, filtered by contract address, event topic, and block range across multiple networks

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)