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EVM Read Contract
x402
EVM Read Contract is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).
Call any read-only EVM smart contract function by providing its signature with return types and arguments, returning decoded on-chain values without needing an ABI file.
Price / call$0.003
Success—
StatusUnknown
How this service works
Call any read-only contract function without a transaction or ABI file: give the signature with return types, e.g. balanceOf(address)(uint256) or getReserves()(uint112,uint112,uint32), plus arguments; returns decoded values.
Output
The endpoint returns the decoded return values from the contract function call, mapped to their Solidity types (e.g., uint256, address, bool, tuple components). Values are returned as their JSON-native equivalents (numbers as strings for large integers, addresses as hex strings, booleans as true/false).
Example use cases
Check DeFi pool reserves
“Can you fetch the current token reserves for the Uniswap V2 WETH/USDC pool at 0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc on Ethereum? Use the getReserves()(uint112,uint112,uint32) signature.”
Look up NFT ownership on-chain
“Who owns token ID 1234 in the Bored Ape Yacht Club contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum? The function is ownerOf(uint256)(address).”
Read Aave lending pool config
“What is the current liquidation threshold for WBTC in the Aave V3 pool on Base? The Aave data provider is at 0x2d8A3C5677189723C4cB8873CfC9C8976ddf54D3, use getUserReserveData(address,address)(uint256,uint256,uint256,uint256,uint256,uint256,uint256,uint256,bool) with the asset and user address.”
Technical details
Endpoint
GEThttps://bess-x402.onrender.com/v1/evm/read?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to query on-chain EVM state for any contract without having to supply or parse a full ABI — especially useful for one-off reads across DeFi protocols, token contracts, or NFTs on Ethereum, Base, Arbitrum, Optimism, or Polygon. Prefer it over full ABI-based tools when you know the specific function signature and want a lightweight, pay-per-call approach.
Side effects
- Invalid or non-existent contract address returns an error or empty response
- Wrong function signature (wrong argument or return types) causes decoding failure
- Arguments not matching the expected Solidity types cause a revert or parsing error
- Unsupported chain name returns a validation error
- Requesting a future or non-existent block number returns an error
- Rate limiting or payment failure returns a 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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