Blockchain And Crypto x402 offerings

Pay-per-request access to CoinGecko, DefiLlama, Alchemy, and Etherscan APIs. No auth, no subscriptions.

On-chain state of ALST, the alest.io token for a tokenized Tesla Cybercab robotaxi (real-world asset). Name, symbol, decimals and total supply read live from Base Sepolia testnet.

alest.io x402 test endpoint. Returns a signed-off JSON confirming the payment. Useful to test agent payments on Base.

Aegis delivery-verified trust check for an x402 service — is it safe to pay?

ASA or ALGO (asaId=0) activity metrics. Wallet/Foundation/supply/Nodes compare two snapshots; Active User stays on averages (vs 7d avg / week avg / month avg). Daily returns the latest completed comparison. Query period=daily|weekly|monthly (prices $0.02/$0.06/$0.16; omit = daily). recordDate is supported only for weekly/monthly. Invalid input → 400 before payment.

Parameter-free: the activity snapshot for all 15 blockchains sold here in one call, each with latest weekly transactions, active addresses, fees, value moved and other metrics with 7-day change and analyst reads. Use to compare chains or rank them by activity without 15 separate calls. From public blockchain data, refreshed daily. JSON, no API key. $0.10 per call. Blockchain IQ.

The complete list of tracked coins (~18k) as {id, symbol, name}, paged: `page` + `perPage` (1-500, default 250). `includePlatforms: true` adds each coin's contract address per platform; `platform` (e.g. base, solana, ethereum) keeps only coins with a contract there; `symbol` keeps one ticker (exact, case-insensitive) across all its namesakes. For bulk id resolution, building a local symbol map, or enumerating every token on one chain; for a single lookup use coin-search.

One paid call on allooloo.io for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of record; allooloo.io: the estate scale block), public-record only, with an EdDSA-signed receipt that resolves forever at https://allooloo.io/x402/receipt/{nonce}. Doctrine: https://agentic-x402.ai/.

ERC20 allowance via allowance (eth_call) - how much a spender is approved to move from an owner's wallet

Gas price on Base right now: gas price, base fee and priority fee in gwei, plus the cost of a simple ETH transfer. Decide whether to transact now or wait. No input needed.

Swap quote and best DEX price on Base: live quotes from Uniswap v3 (all fee tiers) and Aerodrome (stable/volatile) for any ERC-20 pair, ranked best first, with a low-liquidity flag. ETH, USDC, cbBTC, DAI or any token address. Read-only, no swap executed.

Basename and ENS resolver on Base: resolve name.base.eth to an address, or an address to its primary Basename (reverse names returned only when verified).

Is this Ethereum address a contract or a wallet? EOA, EIP-7702 delegated wallet or smart contract, bytecode size, ETH balance and ERC-20 symbol. Safety check before sending funds.

Is this address a contract or a wallet? Checks any Base address: EOA, EIP-7702 delegated wallet or smart contract, bytecode size, ETH balance and ERC-20 symbol. Cheap safety check before sending funds.

ENS resolve on Ethereum: turn a .eth name into an address, or an address into its primary ENS name (reverse names returned only when verified). Forward and reverse lookup.

ERC-20 allowance and token approval check on Base: how much a spender contract is approved to move from an owner wallet, with unlimited-approval detection. Run it before a swap, a bridge or a transferFrom.

ERC20 allowance and token approval check on Ethereum: how much a spender (Permit2, a router, a bridge) is approved to move from an owner wallet, with unlimited-approval detection.

ERC-20 token info on Ethereum: name, symbol, decimals and total supply of any token contract on Ethereum mainnet, read live via eth_call.

ERC-20 token info on Base: name, symbol, decimals and total supply of any token contract, read live on-chain. Check a token before you trade or accept it.

Gas price on Ethereum right now: gas price, base fee and priority fee in gwei, plus the cost of a simple ETH transfer. Decide whether to transact now or wait. No input needed.

Funding rate API for perpetual futures: current funding rate of any coin (BTC, ETH, SOL...) on Hyperliquid, with annualized %, next funding time, 24 h average, mark price, open interest and volume. For trading and arbitrage agents.

Crypto token price in USD: live price of ETH, BTC (cbBTC), DAI, AERO or any Base token address, from on-chain DEX pools (Uniswap v3, Aerodrome), best route direct or via WETH. No API key, read-only.

Transaction status and receipt on Base: success / failed / pending / not found, block, confirmations, from, to, value, gas used and real fee. Payment and settlement verification for agents.

Transaction receipt and status on Ethereum: success / failed / pending / not found, block, confirmations, from, to, value, gas used and fee, via eth_getTransactionReceipt.