Call when an agent needs a read-only Base eth_call. Send to and data (hex) or a function signature plus args. Optional from and block. Reverts return a decoded reason. No state change and no spend. Send JSON {"to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","data":"0x18160ddd"}. Exact $0.004 USDC on Base. Try unpaid POST /v1/sandbox/base-eth-call first.

Call when an agent needs one or more UUID values. version defaults to v4 from crypto; v7 is time-ordered. count is 1 to 50. Local only. No network. Send JSON {"version":"v4","count":1}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/uuid first.

Call when an agent needs the latest Ethereum mainnet block number. Send tag latest, or an empty object. Read-only eth_blockNumber on eip155:1. No spend. Send JSON {"tag":"latest"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-block-number first.

Call when an agent needs the next pending nonce and confirmed transaction count for one Ethereum mainnet address. Send address. Read-only eth_getTransactionCount on eip155:1. No spend. Send JSON {"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-nonce first.

Call when an agent needs the current UTC time as an ISO timestamp plus unix seconds and milliseconds. Send an optional tz offset such as +02:00 to echo it. Local clock only. No network. Send JSON {}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/utc-now first.

Call when an agent needs ERC-20 totalSupply for one Base token, raw and human when decimals() is readable. Send token (example Circle USDC). Read-only eth_call on eip155:8453. No spend. Send JSON {"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/base-total-supply first.

Call when an agent needs a User-Agent string parsed into browser, OS, and device. No network. Send JSON {"user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/ua-parse first.

Call when an agent needs ERC-20 totalSupply for one Ethereum mainnet token, raw and human when decimals() is readable. Send token. Read-only eth_call on eip155:1. No spend. Send JSON {"token":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-total-supply first.

Call when an agent needs ERC-20 name, symbol, decimals, and totalSupply for one Ethereum mainnet token. Send token (example Circle USDC). Read-only eth_call on eip155:1. Not a contract, or no ERC-20 methods, errors. No spend. Send JSON {"token":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/eth-erc20-meta first.

Call when an agent needs the ERC-721 owner of token_id on a Base contract, plus whether ERC-165 reports ERC-721. A missing token errors. Read-only. No spend. Send JSON {"contract":"0x1111111111111111111111111111111111111111","token_id":"1"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/base-nft-owner first.

Call when an agent needs an Ethereum mainnet ERC-20 token balance_raw and human balance for token and owner. Example token is Circle USDC. decimals() scales the human balance. Read-only on eip155:1. No spend. Send JSON {"token":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48","owner":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-erc20-balance first.

Call when an agent needs Ethereum mainnet ETH and USDC balances plus tx_count for one address. Send address as EIP-55 or all-lowercase 0x. Read-only eth_getBalance and USDC balanceOf on eip155:1. No private key and no spend. Send JSON {"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-balance first.

Call when an agent needs status, block, gas used, and decoded ERC-20 Transfer logs for one Ethereum mainnet transaction hash. Status is success, reverted, or pending. A missing hash errors. Read-only. No spend. Send JSON {"hash":"0xabababababababababababababababababababababababababababababababab"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/eth-tx first.

Call when an agent needs an Ethereum mainnet block header and transaction hashes by number or tag latest, finalized, or safe. The hash list is capped at 100. Read-only eth_getBlockByNumber on eip155:1. No spend. Send JSON {"block":"latest"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-block first.

Call when an agent needs native ETH plus up to 20 ERC-20 balances for one Base address. Send address and an optional tokens list; omit tokens for Circle USDC. Multicall3 batches the reads. Read-only. No spend. Send JSON {"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","tokens":["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"]}. Exact $0.005 USDC on Base. Try unpaid POST /v1/sandbox/base-portfolio first.

Call when an agent needs a Flesch reading-ease score for text. No network. Send JSON {"text":"The cat sat on the mat. The mat was flat."}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/flesch-score first.

Call when an agent needs email syntax checked (no SMTP). No network. Send JSON {"email":"Ada@Example.com"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/email-syntax first.

Call when an agent needs a phone number normalized to E.164 when the country is known. No network. Send JSON {"phone":"+1 415 555 0134","region":"US"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/phone-e164 first.

Call when an agent needs a unified diff of two strings. Use it to compare a draft with the previous text. No network. Input size is capped. Send JSON {"a":"one\n","b":"two\n"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/diff-text first.

Call when an agent needs a JSONPath query evaluated over JSON. No network. Send JSON {"json":{"user":{"name":"Ada"}},"path":"$.user.name"}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/json-path first.