Base Mainnet

base-pending-block x402 REST usage

The current pending Base mainnet block (mempool, not yet mined) - unconfirmed transactions via eth_getBlockByNumber('pending').

x402.agentindex.world Other services 3 calls / 30d checked 2026-10-26

0.01 USDC per call per call

base-tx x402 REST usage

Base transaction lookup by hash - sender, recipient, value, calldata, gas and block, live from Base mainnet via eth_getTransactionByHash.

x402.agentindex.world Other services 3 calls / 30d checked 2026-10-26

0.008 USDC per call per call

base-nft-metadata x402 REST usage

NFT metadata URI for an ERC721 token on Base mainnet via tokenURI - the on-chain pointer (IPFS, HTTP, or data URI), not a fetch of the document itself.

x402.agentindex.world Crypto & Payments 2 calls / 30d checked 2026-10-26

0.008 USDC per call per call

base-nft-holdings x402 REST usage

NFT holdings for a wallet in one Base ERC721 collection, owned token IDs via ERC721Enumerable (tokenOfOwnerByIndex) - up to 20 tokens, requires the collection to implement Enumerable.

x402.agentindex.world Crypto & Payments 2 calls / 30d checked 2026-10-26

0.008 USDC per call per call

base-contract x402 REST usage

Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.

x402.agentindex.world Crypto & Payments 3 calls / 30d checked 2026-10-26

0.005 USDC per call per call

base-call x402 REST usage

Generic read-only eth_call against any Base mainnet contract - pass raw calldata, get the raw return data back.

x402.agentindex.world Other services 3 calls / 30d checked 2026-10-26

0.005 USDC per call per call

base-estimate-gas x402 REST usage

Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.

x402.agentindex.world Crypto & Payments 3 calls / 30d checked 2026-10-26

0.004 USDC per call per call

base-storage x402 REST usage

Read a contract storage slot on Base mainnet via eth_getStorageAt - the raw 32-byte value, decoded as hex and unsigned integer, zero-filled if unset.

x402.agentindex.world Search & Research 2 calls / 30d checked 2026-10-26

0.005 USDC per call per call

base-receipt x402 REST usage

Transaction receipt via eth_getTransactionReceipt - status, gas used, and event logs for a mined Base mainnet transaction.

x402.agentindex.world Infrastructure 2 calls / 30d checked 2026-10-26

0.005 USDC per call per call

base-proxy x402 REST usage

Is this Base contract an upgradeable proxy? Proxy contract detection for EIP-1967 (transparent/UUPS), beacon, or EIP-1822 patterns, returning the implementation address.

x402.agentindex.world Geo & Maps 2 calls / 30d checked 2026-10-26

0.005 USDC per call per call

base-events x402 REST usage

Smart contract event logs on Base mainnet (Base contract events) via eth_getLogs - filter by contract address and up to 4 topics, up to 2,000 blocks, raw logs with topics, data, block and tx hash.

x402.agentindex.world Infrastructure 2 calls / 30d checked 2026-10-26

0.005 USDC per call per call

base-nonce x402 REST usage

Next transaction nonce for any Base mainnet wallet via eth_getTransactionCount - how many transactions it has sent.

x402.agentindex.world Crypto & Payments 3 calls / 30d checked 2026-10-26

0.003 USDC per call per call

base-erc20-balance x402 REST usage

ERC20 token balance for a wallet on Base mainnet - balanceOf() and decimals() batched into one Multicall3 round trip.

x402.agentindex.world Crypto & Payments 3 calls / 30d checked 2026-10-26

0.003 USDC per call per call

base-erc1155-balance x402 REST usage

ERC1155 multi-token balance for a wallet and token id on Base mainnet via balanceOf(address,uint256).

x402.agentindex.world Data & Finance 3 calls / 30d checked 2026-10-26

0.003 USDC per call per call

base-code x402 REST usage

Check whether a Base mainnet address is a contract via eth_getCode - returns bytecode size, zero for an externally-owned account.

x402.agentindex.world Dev & Code 3 calls / 30d checked 2026-10-26

0.003 USDC per call per call

base-block x402 REST usage

Fetch a Base mainnet block header and transaction hashes by number, tag (latest/earliest/safe/finalized), or hash via eth_getBlockByNumber/eth_getBlockByHash.

x402.agentindex.world Other services 3 calls / 30d checked 2026-10-26

0.003 USDC per call per call

base-allowance x402 REST usage

ERC20 allowance on Base mainnet via RPC: how much a spender is approved to move from an owner balance, read with allowance(owner,spender) eth_call.

x402.agentindex.world Crypto & Payments 3 calls / 30d checked 2026-10-26

0.003 USDC per call per call

base-block-number x402 REST usage

Latest Base mainnet block height via eth_blockNumber - the current chain tip.

x402.agentindex.world Other services 8 calls / 30d checked 2026-10-26

0.001 USDC per call per call

x402-boj-macro-snapshot x402 REST usage

Learning-only BOJ-themed macro snapshot API for x402 v2 Base mainnet verification.

x402-boj-macro-snapshot.vercel.app Crypto & Payments 6 calls / 30d checked 2026-10-26

0.001 USDC per call per call

base-nft-owner x402 REST usage

Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).

x402.agentindex.world Crypto & Payments 2 calls / 30d checked 2026-10-26

0.003 USDC per call per call

base-network-info x402 REST usage

Base mainnet network info in one call: chain ID, block height, and current gas price (wei and gwei).

x402.agentindex.world Other services 3 calls / 30d checked 2026-10-26

0.001 USDC per call per call

base-chain-id x402 REST usage

Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.

x402.agentindex.world Other services 3 calls / 30d checked 2026-10-26

0.001 USDC per call per call