Blockchain And Crypto x402 offerings

ERC20 allowance on Ethereum, Base, Arc or BNB Chain: how much a spender may move from an owner, raw and in token units, and whether the approval is effectively unlimited. Pass ?token=&owner=&spender=&chain=

Use when an agent is about to approve a spender, or is auditing what it approved before: how much of a token the spender may still move on the owner's behalf, raw and formatted with its decimals, plus unlimited, which flags a forgotten infinite approval. Do not use for what the wallet actually holds (/v1/evm/erc20-balance) or for whether the token is safe (/v1/evm/token-safety). No API key.

ERC20 token balance for any Ethereum wallet - USDC, USDT, DAI, or any token - via balanceOf (eth_call) on OneSource live Ethereum RPC

Use when an agent must decide whether to touch a token at all: a pre-trade risk check on Base, Ethereum, Polygon, Arbitrum or Optimism, straight from the deployed bytecode and live state. Detects mint, pause, blacklist, upgradeable proxy and mutable buy/sell tax powers, and reports whether ownership is renounced. It returns the EVIDENCE - the exact selector found and its byte offset - so an agent can apply its own policy. Deterministic: same contract, same answer.

Use when an agent must confirm a wallet holds enough of a token before it swaps, pays or settles: the ERC-20 balance of any address for any token (USDC, USDT, DAI or any other), returned raw (exact integer string) with its decimals, the formatted amount and the symbol, so no rounding is forced on you. Do not use for the native coin (/v1/evm/balance) or for what a contract is allowed to spend (/v1/evm/erc20-allowance). No API key, no account.

ERC20 token balance of any wallet on Ethereum, Base, Arc or BNB Chain: pass ?address=&token=&chain= and get the raw balance, the decimals, the symbol and the balance in token units, with the block it was read at. A token address with no contract on that chain is refused before any charge.

Use when an agent has a bare token address and must label or format it before showing or computing anything: name, symbol, decimals and total supply of any ERC-20 in one call. decimals is what stops an amount being shown a million times too big. Do not use for a holder's balance (/v1/evm/erc20-balance), the price (/v1/evm/token-price) or the risk (/v1/evm/token-safety). No API key, no account.

Read an ERC20 token contract on Base, Ethereum or IOTA EVM mainnet: name, symbol, decimals, total supply, and optionally the balance of one holder address. Verifies that the address is a contract. Params: token (contract address, required), chain ('base' default, 'ethereum' or 'iota-evm'), holder (optional address).

ERC20 Transfer logs via eth_getLogs - raw Transfer events for a token or wallet

Trustless USDC escrow for AI agents. Lock funds for a task, pay the worker when the principal approves, or dispute and refund. Solana settlement, no accounts.

Trustless USDC escrow for AI agents. Lock funds for a task, pay the worker when the principal approves, or dispute and refund. Solana settlement, no accounts.

Use when an agent is about to sign a transaction and must know whether it will fail and what it will cost: the gas this exact call needs, the current gas price, the cost in ether, and wouldRevert, which says the transaction would fail before you spend anything finding out. Do not use for the price of a plain transfer (/v1/evm/gas) or for EIP-1559 caps (/v1/evm/fees). No API key, no account.

Crypto ETF flow intelligence — daily/weekly net flows for US spot BTC, ETH, and SOL ETFs, live per-issuer breakdown (IBIT, FBTC, ARKB, ETHA and more), cumulative flows, and a deterministic accelerating/decelerating streak read. For advisor, RIA, and trading agents.

Daily net creation/redemption flow for spot Bitcoin or Ethereum ETFs, computed from each issuer's own holdings disclosure: per-fund and total net flow in USD and coin for the latest day, a recent series and the window cumulative. One normalized call instead of polling each issuer site and differencing units.

Daily net creation/redemption flow for spot Bitcoin or Ethereum ETFs, computed from each issuer's own holdings disclosure: per-fund and total net flow in USD and coin for the latest day, a recent series and the window cumulative. One normalized call instead of polling each issuer site and differencing units.

Live Ethereum mainnet gas pricing from PublicNode RPC: next-block base fee, 25/50/75th-percentile priority tips over the last 5 blocks (slow/std/fast), and a ready-to-sign recommendation (max_fee = 2*base + tip). Query: ?speed=slow|std|fast (default std). All values are decimal gwei, no hex parsing needed. 30s cache.

ETH liquidation flow — real-time across 4 exchanges — Ed25519 signed attestation

AgentOracle: latest spot price for a single token by ticker symbol — minimal payload (`{ symbol, priceUsd, asOf }`) optimised for high-frequency polling agents. Case-insensitive symbol; returns 404 for unknown symbols.

Current ETH price in USD and BTC, from Etherscan's V2 API. A quick single-value price check -- for market cap/volume/supply detail use /crypto-prices instead. Not address-specific. $0.005/call.

Returns Ethereum supply statistics from Etherscan.

AgentOracle: price history time-series for a single token — array of `{ t, price }` points at hourly or daily intervals. Pass `interval=hour` (returns hourly points over last 1-14 days) or `interval=day` (daily points over last 30-365 days). `limit` defaults to 24, max 200. Ideal for trading bots, charting agents, and backtesting.

AgentOracle: lookup a single on-chain crypto token by ticker symbol (case-insensitive, e.g. ETH, BTC, SOL). Returns the full price / volume / liquidity / market-cap snapshot, or 404 if the symbol is unknown.

Total ETH supply, from Etherscan's V2 API. Not address-specific. $0.01/call.

Read-only contract call (eth_call) on Ethereum, Base, Arc or BNB Chain: pass ?to=&data= (hex calldata) and optional &from=, get the returned bytes or the revert reason, at a named block. Nothing is signed or sent.