Blockchain And Crypto x402 offerings

What the tokens trending on a chain right now actually are — contract type, tags and a one-line summary. No input required.

Get recent DEX trades by smart money wallets. Spot what top traders are actively buying/selling.

Get the connected wallet and vault info across all networks

Mints a voting token on Emoji.Today in exchange for the specified USDC payment (on eip155:8453), granting voting rights.

Encode a contract function call (calldata) from its signature and arguments, e.g. transfer(address,uint256) with [to, amount]: selector and hex data ready to sign or simulate.

Reverse-resolve a batch of Ethereum addresses to ENS primary names + avatar URLs (up to 50 per call). Returns one row per address with name (or null), displayName (with checksum if no name), and avatar URI. Use to label transaction lists, wallet leaderboards, or NFT holder snapshots with human-readable names instead of 0xabc… stubs.

Resolve ENS in either direction on Ethereum: an ENS name (vitalik.eth) → its 0x address, or a 0x address → its primary ENS name (plus avatar when set). The identity read wallet, payment, and UX agents make to verify who they're sending to or to show a human-readable name instead of a raw hex address. Free upstream (Blockscout ENS / live registry); one paid call instead of running your. List your own x402 service on bazaar.agentexchange.work/listings: 1 USD, 30 days, live at once, no account.

Use when an agent has a name where it needs an address, or the other way round, before it can act: resolves an ENS name to its address or an address to its primary ENS name, read straight from Ethereum mainnet, with found telling you when there is no record. Do not use to check an address is well formed (/v1/util/address) or that it is a wallet (/v1/evm/is-contract). No API key.

ENS resolve on Ethereum: a .eth name to its address (?name=vitalik.eth), or an address to its primary ENS name (?address=0x...), forward-verified so a reverse record pointing elsewhere is never returned as the name.

Resolve an ENS name (e.g. vitalik.eth) to its Ethereum address - so an agent can turn a human-readable recipient into a payable address. Read-only on Ethereum mainnet.

Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.

Forward + reverse ENS resolution on Ethereum mainnet: turn vitalik.eth into an address, or an address into its primary ENS name. Complements the Basename resolver for Base.

Resolve an ENS name to its address and profile records (avatar, url, twitter, github, email, description), or reverse-resolve an address to its primary ENS name. $0.01 per call.

Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.

The current chain tip (latest block height) via eth_blockNumber, across Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis. The freshness read settlement, indexing and trading agents poll to know where the chain is. Live public RPC; one paid call.

Resolves entity data through a paid API endpoint for Base USDC.

Fetch live gas price estimations and base fees for EVM chains

How many of one ERC-1155 token id an account holds, read straight from the contract. ERC-1155 is the multi-token standard behind most game items, editions and passes, where a single contract holds many ids and a balance is a quantity rather than ownership of one thing. Returns the balance as a decimal string. EVM chains: ethereum, base, polygon, arbitrum, optimism.

How much of an ERC-20 token a spender contract is approved to move from an owner wallet - the approval check an agent runs before a swap, a bridge, or an x402 transferWithAuthorization flow. Returns the allowance as an exact decimal string scaled by the token's decimals, the raw uint256, and an `unlimited` flag for max-uint style approvals.

Name, symbol, decimals and total supply for any ERC-20, read straight off the contract with four parallel eth_calls plus an eth_getCode existence check, across Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis. Because it reads the contract rather than an indexer, it answers for tokens minted MINUTES ago and on chains no explorer covers — the gap that makes /chain/supply (indexer-backed) return nothing for a fresh launch. Non-standard tokens are handled honestly: legacy bytes32 name/symbol ar

Resolve an ERC-20 contract address to its on-chain metadata: symbol, decimals, name, and logo URL where available. Use this to humanize a raw contract address before showing it to a user or before computing fiat values.

Recent ERC-20 token transfer events for a wallet address on Ethereum in one call: token name/symbol, decimal-adjusted value, and counterparties -- from Etherscan's V2 API. Optionally filter to one token via contract_address. Supports optional limit (default 25, max 100). $0.01/call.

Recent Transfer events of an ERC-20 token (newest first, up to 50): tx, time, from, to, amount in token units. Optional holder filters to transfers from or to one wallet. Reads up to the last 12000 blocks (fewer on very busy tokens) via RPC, so it is cheap but not a full history; the response says what range was searched. Use for quick wallet or token activity checks.

List every ERC721 NFT token_id a wallet owns in a collection via tokenOfOwnerByIndex (eth_call)