Straelo Relay Chain Contract Call

x402

Straelo Relay Chain Contract Call is a paid API for AI agents from relay.straelo.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Executes a read call against an EVM smart contract on Ethereum or Base by submitting hex-encoded calldata and returning the raw on-chain result.

Price / call$0.005

Seller volume →—

Success—

StatusUnknown

How this service works

Execute a read-only EVM smart contract call on Ethereum or Base and return the normalized result without managing an RPC provider.

Output

A JSON object containing the raw hex result of the contract call, the chain queried, the contract address called, the provider name, and the round-trip latency in milliseconds. The result field holds the ABI-encoded return value which must be decoded by the caller.

Example use cases

Read token balance from Base

“Query the token balance for wallet 0xDEAD...BEEF on the USDC contract deployed on Base — use this calldata: 0x70a08231000000000000000000000000deadbeefdeadbeefdeadbeefdeadbeefdeadbeef”

Check DeFi pool state on Ethereum

“I need to read the current reserves of a Uniswap V2 pool at 0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc on Ethereum — call it with getReserves calldata 0x0902f1ac”

Verify NFT ownership on Base

“Check who owns token ID 42 on the NFT contract at 0x1234567890abcdef1234567890abcdef12345678 on Base using the ownerOf calldata 0x6352211e000000000000000000000000000000000000000000000000000000000000002a”

Technical details

Endpoint

POSThttps://relay.straelo.com/chain-contract-call?utm_source=zero.xyz

When to prefer

Use this endpoint when an AI agent needs to query on-chain state from an Ethereum or Base smart contract without running a local node or managing RPC keys. It is ideal for reading contract data (balances, ownership, pool state) via pre-encoded EVM calldata. Prefer this over general-purpose RPC providers when you need a pay-per-call x402-compatible API with no API key setup, especially in agentic pipelines that already handle USDC micropayments.

Side effects

Invalid hex calldata returns a parse or execution error
Contract address not deployed on the specified chain returns an empty result or revert
Unsupported chain value (anything other than 'ethereum' or 'base') returns a validation error
Network congestion or RPC downtime may cause elevated latency or timeout
Malformed contract_address (non-checksummed or invalid length) may cause a rejection

Input

Schema · Request body

Field	Type	Description
data	string	Read-only hexadecimal ABI calldata.
chain	string	EVM network for the read-only call.
contract_address	string	Target EVM contract address.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "chain": "base",
    "result": "0x",
    "provider": "aex402",
    "latency_ms": 20,
    "contract_address": "0x0000000000000000000000000000000000000000"
  }
}

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