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EVM Contract Read-Only Function Caller
x402
EVM Contract Read-Only Function Caller is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-09).
Calls any read-only (view) function on an EVM smart contract by function signature and returns the decoded result
Price / call$0.004
Success—
StatusUnknown
How this service works
Call any read-only (view) function of an EVM contract from its signature, e.g. balanceOf(address)(uint256), with arguments, and get the decoded result. Supports address, bool, intN/uintN, bytesN, string, bytes and arrays. Read-only: nothing is signed or sent.
Output
A JSON object containing the network, the function signature called, the contract address, the 4-byte selector, a 'resultado' array of decoded return values as strings (one element per output parameter), and 'resultado_hex' with the raw ABI-encoded hex response.
Example use cases
Check ERC-20 token balance
“What is the USDC balance of wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base? Call balanceOf(address)(uint256) on contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with that address as the argument.”
Read NFT collection ownership
“Who owns token ID 42 of the NFT contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum? Call ownerOf(uint256)(address) with argument 42.”
Query DeFi pool reserve state
“What are the current reserves in the Uniswap V2 liquidity pool at 0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc on Ethereum? Call getReserves()(uint112,uint112,uint32) with no arguments.”
Technical details
Endpoint
POSThttps://api.vextorium.com/leer-contrato-pago?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to read state from any EVM smart contract using a human-readable function signature with automatic ABI decoding. It is ideal when you know the function signature but do not have a full ABI, want decoded outputs rather than raw hex, and need to support multiple EVM chains. Prefer the sibling raw eth_call endpoint if you already have pre-encoded calldata and only need the raw 32-byte word split response.
Side effects
- Invalid contract address format returns an error
- Incorrect function signature or mismatched output types causes decode failure
- Unsupported network name (not one of base, ethereum, arbitrum, optimism, polygon) returns a validation error
- Wrong number or type of arguments causes revert or decode failure
- Contract does not exist at the given address on the specified network
- Function is not a view/pure function and cannot be called read-only
- Network RPC unavailable returns a timeout or connection error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"red": "base",
"funcion": "name()",
"contrato": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"selector": "0x06fdde03",
"resultado": [
"USD Coin"
],
"resultado_hex": "0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000855534420436f696e000000000000000000000000000000000000000000000000"
}
}Tags
x402
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