x402 Directory

Onchain

Paid onchain APIs an AI agent can call with x402.

516 endpoints

Deepnets · Token Safety

Deepnets · api.deepnets.ai

Token safety analysis for a Solana mint: overall risk level, wallet-network concentration, bundle detection, mintable/freezable flags, critical risks, and warnings. Returns the most recent cached analysis.

$0.01 Solana 100% up 2,993 paid calls

Onesource · Chain Block Number

Onesource · api.onesource.io

Latest Ethereum block height - current chain tip via eth_blockNumber

$0.001 Base 100% up 1,268 paid calls

Onesource · Chain Erc20 Balance

Onesource · api.onesource.io

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

$0.003 Base 100% up 1,146 paid calls

Onesource · Chain ENS

Onesource · api.onesource.io

ENS resolve - turn a .eth name into an address, or an address into its primary .eth name, via eth_call on OneSource live Ethereum RPC

$0.005 Base 100% up 1,137 paid calls

Onesource · Chain Live Balance

Onesource · api.onesource.io

Live wallet balance - native ETH plus up to 20 caller-supplied ERC20 tokens in one bounded RPC batch

$0.003 Base 100% up 1,014 paid calls

Onesource · Chain TX

Onesource · api.onesource.io

Full Ethereum transaction details by hash via eth_getTransactionByHash - from, to, value, calldata, block

$0.008 Base 100% up 992 paid calls

Onesource · Chain Block

Onesource · api.onesource.io

Fetch an Ethereum block header and transaction hashes by number, tag, or hex via eth_getBlockByNumber

$0.003 Base 100% up 757 paid calls

Onesource · Chain Nonce

Onesource · api.onesource.io

Next transaction nonce for any Ethereum wallet via eth_getTransactionCount - how many txs it has sent

$0.003 Base 100% up 757 paid calls

Onesource · Chain Contract

Onesource · api.onesource.io

Best-effort contract introspection via batched RPC - bytecode presence, token metadata, and ERC20-like/ERC721/ERC1155 classification

$0.005 Base 100% up 748 paid calls

Onesource · Chain Erc721 Tokens

Onesource · api.onesource.io

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

$0.008 Base 100% up 743 paid calls

Onesource · Chain Erc20 Transfers

Onesource · api.onesource.io

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

$0.005 Base 100% up 742 paid calls

Onesource · Chain NFT Metadata

Onesource · api.onesource.io

NFT metadata for ERC721 or ERC1155 tokens via eth_call, with IPFS, Arweave, data URI, and public HTTP(S) resolution

$0.008 Base 100% up 730 paid calls

Onesource · Chain Total Supply

Onesource · api.onesource.io

Total supply of an ERC20 or ERC721 token contract via totalSupply (eth_call)

$0.003 Base 100% up 729 paid calls

Stockwaves · Xstock Health

Stockwaves · stockwaves.net

Is this tokenized stock safe to buy? Pre-trade RWA check before an agent buys an on-chain US stock. ?symbol=AAPLx or ?address= returns ok/review/avoid + AUTHENTICITY - the REAL issuer token or an IMPERSONATOR? Verified against Backed/xStocks' registry and Ondo's on-chain mint authority. Plus depeg_bps, liquidity, trading_halted, freeze_authority. ?underlying=TSLA compares every verified version across issuers; ?watch=a,b returns only what CHANGED.

$0.03 Base 729 paid calls

Onesource · Chain Receipt

Onesource · api.onesource.io

Transaction receipt via eth_getTransactionReceipt - status, gas, and event logs for a mined Ethereum transaction

$0.005 Base 100% up 721 paid calls

base-gas-x402 · GAS

base-gas-x402 · base-gas-x402-production.up.railway.app

Live Base mainnet gas: EIP-1559 base fee, low/medium/high priority tiers in gwei, and a transaction cost estimate for any gas limit.

$0.005 Base 706 paid calls

Loyalspark · Recipient API Balance

Loyalspark · api.loyalspark.online

Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with every purchase, and AI agents automate the rest via REST and MCP. Free plan mints up to 1,000 tokens per month; every call is scoped by row-level security to the wallet behind the API key. 16 skill guides at loyalspark.online/.well-known/skills/index.md.

$0.001 Base 100% up 491 paid calls

Onesource · Chain NFT Owner

Onesource · api.onesource.io

Look up the current owner of an ERC721 NFT by token_id via ownerOf (eth_call)

$0.003 Base 100% up 466 paid calls

Onesource · Chain Chain ID

Onesource · api.onesource.io

Ethereum chain ID (EIP-155) via eth_chainId - confirm which chain a network is on

$0.001 Base 100% up 450 paid calls