# Services from api.onesource.io on Zero

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

## Services

- [OneSource ERC-20 Transfer History](https://www.zero.xyz/c/onesource-erc-20-transfer-history-5acf567a/llms.txt): $0.005/call via x402. Retrieves ERC-20 token transfer events for a specific token contract and/or wallet address on Ethereum mainnet or Sepolia testnet over a specified block range
- [OneSource ERC-1155 Token Balance Lookup](https://www.zero.xyz/c/onesource-erc-1155-token-balance-lookup-797a5965/llms.txt): $0.003/call via x402. Returns the ERC-1155 NFT token balance for a given wallet address, contract, and token ID on Ethereum mainnet or Sepolia testnet
- [OneSource Ethereum Event Logs (eth_getLogs)](https://www.zero.xyz/c/onesource-ethereum-event-logs-eth-getlogs-dad3a1cc/llms.txt): $0.005/call via x402. Fetches on-chain Ethereum event logs filtered by contract address, topic hash, and block range on mainnet or Sepolia testnet
- [OneSource Ethereum Transaction Receipt Lookup](https://www.zero.xyz/c/onesource-ethereum-transaction-receipt-lookup-e1b3a05e/llms.txt): $0.005/call via x402. Fetches the on-chain transaction receipt for a given Ethereum or Sepolia transaction hash, including status, gas used, logs, and block details.
- [OneSource Deepstate Order Book Snapshot](https://www.zero.xyz/c/onesource-deepstate-order-book-snapshot-8b82cd1f/llms.txt): $0.005/call via x402. Returns a full order-book snapshot for a named market, with bids sorted descending and asks sorted ascending, including summary statistics like spread and mid price
- [OneSource Ethereum Gas Estimator](https://www.zero.xyz/c/onesource-ethereum-gas-estimator-78de69c8/llms.txt): $0.004/call via x402. Estimates the gas required to execute an Ethereum transaction given recipient, calldata, sender, and optional value
- [OneSource ERC-721 Token Holdings Lookup](https://www.zero.xyz/c/onesource-erc-721-token-holdings-lookup-39d68a93/llms.txt): $0.008/call via x402. Returns all ERC-721 (NFT) token IDs owned by a given address for a specific contract on Ethereum mainnet or Sepolia testnet
- [OneSource Ethereum Contract Introspection](https://www.zero.xyz/c/onesource-ethereum-contract-introspection-7ff57c54/llms.txt): $0.005/call via x402. Fetches on-chain contract metadata (name, symbol, decimals, ERC interface support) for a given Ethereum or Sepolia contract address
- [OneSource Deepstate On-Chain Trades Feed](https://www.zero.xyz/c/onesource-deepstate-on-chain-trades-feed-88405963/llms.txt): $0.005/call via x402. Returns recent matched trades (fills) for a specific on-chain order book on the Deepstate decentralized exchange, including price, amounts, sides, and block-level metadata.
- [OneSource Deepstate Depth History](https://www.zero.xyz/c/onesource-deepstate-depth-history-06fa6602/llms.txt): $0.02/call via x402. Returns a time-series heatmap of resting order sizes by price level for a given order book market, with configurable time range and resolution
- [OneSource ENS Resolver](https://www.zero.xyz/c/onesource-ens-resolver-841cf9f0/llms.txt): $0.005/call via x402. Resolves an ENS .eth name to its Ethereum address, or reverse-resolves an Ethereum address to its primary .eth name, via live eth_call on the Ethereum network.
- [OneSource Ethereum Transaction Receipt Lookup](https://www.zero.xyz/c/onesource-ethereum-transaction-receipt-lookup-fa31dbd7/llms.txt): $0.005/call via x402. Fetches the mined transaction receipt for a given Ethereum transaction hash, returning status, gas used, and emitted event logs via eth_getTransactionReceipt
- [OneSource Deepstate OHLCV Candles API](https://www.zero.xyz/c/onesource-deepstate-ohlcv-candles-api-ac3abb78/llms.txt): $0.005/call via x402. Returns OHLCV candlestick data for a Deepstate on-chain order book at a specified timeframe and optional date range
- [OneSource ENS Name Resolution](https://www.zero.xyz/c/onesource-ens-name-resolution-8625e5f6/llms.txt): $0.005/call via x402. Resolves an ENS name (e.g. vitalik.eth) or Ethereum address to its canonical Ethereum address on mainnet or Sepolia testnet
- [OneSource Deepstate Maker Analytics](https://www.zero.xyz/c/onesource-deepstate-maker-analytics-bea0c434/llms.txt): $0.02/call via x402. Returns per-maker time-at-top-of-book, notional rested, fill counts, fill rate, and DEEP rewards earned for a specified Deepstate market book.
- [OneSource eth_getCode Contract Checker](https://www.zero.xyz/c/onesource-eth-getcode-contract-checker-8d0c3a7f/llms.txt): $0.003/call via x402. Returns deployed bytecode for an Ethereum address to determine whether it is a smart contract or an externally owned account (EOA)
- [OneSource ERC20 Token Balance](https://www.zero.xyz/c/onesource-erc20-token-balance-ca8b3a79/llms.txt): $0.003/call via x402. Returns the ERC20 token balance for any Ethereum wallet address by calling balanceOf on-chain via live Ethereum RPC
- [OneSource Ethereum Transaction Lookup by Hash](https://www.zero.xyz/c/onesource-ethereum-transaction-lookup-by-hash-448c869e/llms.txt): $0.008/call via x402. Fetches full Ethereum transaction details (from, to, value, calldata, block) by transaction hash using eth_getTransactionByHash
- [OneSource Contract Introspection](https://www.zero.xyz/c/onesource-contract-introspection-749d480b/llms.txt): $0.005/call via x402. Retrieves name, symbol, decimals, and ERC20/721/1155 interface support for a smart contract address via eth_call
- [OneSource Ethereum Block Number RPC](https://www.zero.xyz/c/onesource-ethereum-block-number-rpc-b38fffe5/llms.txt): $0.001/call via x402. Returns the current latest block number for Ethereum mainnet or Sepolia testnet from OneSource-operated nodes
- [OneSource Ethereum Block Header by Number](https://www.zero.xyz/c/onesource-ethereum-block-header-by-number-974e6003/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
- [OneSource Ethereum RPC eth_call](https://www.zero.xyz/c/onesource-ethereum-rpc-eth-call-ca0c9e7f/llms.txt): $0.005/call via x402. Executes a raw Ethereum eth_call against a contract on mainnet or Sepolia testnet, returning the encoded result
- [NFT Owner Lookup by Token ID (ERC721)](https://www.zero.xyz/c/nft-owner-lookup-by-token-id-erc721-64bcff13/llms.txt): $0.003/call via x402. Returns the current owner address of a specific ERC721 NFT by calling ownerOf on-chain via eth_call
- [OneSource Ethereum Transaction Nonce Lookup](https://www.zero.xyz/c/onesource-ethereum-transaction-nonce-lookup-3b274c2d/llms.txt): $0.003/call via x402. Returns the next transaction nonce (transaction count) for any Ethereum wallet address via eth_getTransactionCount
- [OneSource Deepstate OHLCV Candles](https://www.zero.xyz/c/onesource-deepstate-ohlcv-candles-50180eeb/llms.txt): $0.005/call via x402. Fetches OHLCV (open, high, low, close, volume) candlestick data for a specified trading book/market at a given timeframe
- [Deepstate Market Rolling Stats](https://www.zero.xyz/c/deepstate-market-rolling-stats-3eace80d/llms.txt): $0.005/call via x402. Returns rolling 24h, 7d, and 30d volume and price change statistics for a specified Deepstate order book market
- [ERC20 Allowance Lookup (eth_call)](https://www.zero.xyz/c/erc20-allowance-lookup-eth-call-f68943f7/llms.txt): $0.003/call via x402. Returns how many tokens a spender is approved to transfer from an owner's wallet for a given ERC20 token contract on Ethereum or Sepolia.
- [OneSource Ethereum Chain ID Lookup](https://www.zero.xyz/c/onesource-ethereum-chain-id-lookup-955334b5/llms.txt): $0.001/call via x402. Returns the EIP-155 chain ID for Ethereum mainnet or Sepolia testnet via eth_chainId RPC call
- [OneSource Ethereum Network Info (Chain ID + Block Height + Gas Price)](https://www.zero.xyz/c/onesource-ethereum-network-info-chain-id-block-height-gas-price-f324b738/llms.txt): $0.001/call via x402. Returns the current Ethereum network state — chain ID, latest block number, and current gas price — in a single batched RPC call
- [OneSource NFT Metadata Lookup](https://www.zero.xyz/c/onesource-nft-metadata-lookup-4202be35/llms.txt): $0.008/call via x402. Fetches NFT metadata, traits, and image URI for any ERC721 or ERC1155 token on Ethereum via eth_call with IPFS resolution
- [OneSource Proxy Pattern Detector](https://www.zero.xyz/c/onesource-proxy-pattern-detector-fa9e0bd9/llms.txt): $0.005/call via x402. Detects upgradeable proxy patterns (EIP-1967, UUPS, Transparent) on Ethereum contracts and returns the underlying implementation address
- [OneSource Total Supply Lookup](https://www.zero.xyz/c/onesource-total-supply-lookup-b6fa30f8/llms.txt): $0.003/call via x402. Returns the total supply of an ERC20 or ERC721 token contract by calling the totalSupply function on-chain via eth_call
- [OneSource Live Wallet Balance (ETH + ERC20)](https://www.zero.xyz/c/onesource-live-wallet-balance-eth-erc20-f94e695e/llms.txt): $0.003/call via x402. Returns the native ETH balance plus balances of any specified ERC20 tokens for a given Ethereum wallet address in a single API call.
- [OneSource Ethereum Storage Slot Reader](https://www.zero.xyz/c/onesource-ethereum-storage-slot-reader-45fc26b3/llms.txt): $0.005/call via x402. Reads a raw storage slot value from an Ethereum smart contract at a specified block on mainnet or Sepolia testnet
- [OneSource Deepstate Trade Tape](https://www.zero.xyz/c/onesource-deepstate-trade-tape-f760cb71/llms.txt): $0.005/call via x402. Returns the on-chain trade history (tape) for a specific Deepstate order book market, sorted newest first, with full execution details per trade.
- [OneSource Ethereum Pending Block RPC](https://www.zero.xyz/c/onesource-ethereum-pending-block-rpc-f9d636ad/llms.txt): $0.01/call via x402. Returns the current pending block data (hash, number, transaction count) for Ethereum mainnet or Sepolia testnet
- [OneSource Ethereum Block Lookup RPC](https://www.zero.xyz/c/onesource-ethereum-block-lookup-rpc-abefdcd1/llms.txt): $0.003/call via x402. Fetches on-chain block data (hash, number, gas used, timestamp, parent hash) for a given block number or tag on Ethereum mainnet or Sepolia testnet
- [OneSource Deepstate Market Stats](https://www.zero.xyz/c/onesource-deepstate-market-stats-7660e567/llms.txt): $0.005/call via x402. Returns aggregated on-chain market statistics (OHLC, VWAP, volume, trade count, price change) for a Deepstate order-book over 24h, 7d, and 30d windows
- [OneSource Ethereum Transaction Lookup by Hash](https://www.zero.xyz/c/onesource-ethereum-transaction-lookup-by-hash-13777276/llms.txt): $0.008/call via x402. Retrieves full on-chain transaction details for a given Ethereum transaction hash on mainnet or Sepolia testnet
- [OneSource Ethereum Contract Bytecode Retrieval](https://www.zero.xyz/c/onesource-ethereum-contract-bytecode-retrieval-0f4a7263/llms.txt): $0.003/call via x402. Fetches the deployed bytecode and contract metadata for an Ethereum address on mainnet or Sepolia testnet
- [OneSource Deepstate Order Book API](https://www.zero.xyz/c/onesource-deepstate-order-book-api-3a771c23/llms.txt): $0.005/call via x402. Retrieves the full live on-chain order book (bids and asks) for a specified Deepstate market, including order details, depth summary, and market session info.
- [OneSource Ethereum RPC – Get Address Nonce](https://www.zero.xyz/c/onesource-ethereum-rpc-get-address-nonce-c6362841/llms.txt): $0.003/call via x402. Returns the transaction count (nonce) for an Ethereum address at a specified block on mainnet or Sepolia testnet
- [OneSource Ethereum Contract Proxy Lookup](https://www.zero.xyz/c/onesource-ethereum-contract-proxy-lookup-b5a47e91/llms.txt): $0.005/call via x402. Looks up Ethereum contract metadata (proxy status, implementation address) for a given contract address on mainnet or Sepolia testnet
- [OneSource Deepstate Market Cost-to-Quote Analytics](https://www.zero.xyz/c/onesource-deepstate-market-cost-to-quote-analytics-0c555191/llms.txt): $0.02/call via x402. Returns gas cost analytics (fees, rests, cancels) for resting and cancelling orders on a Deepstate order book market, bucketed by time period
- [Deepstate Markets List](https://www.zero.xyz/c/deepstate-markets-list-4a323719/llms.txt): $0.005/call via x402. Returns all Deepstate markets with their token layout, contract addresses, pool IDs, and deployment metadata

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)