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Base Contract Generic Read (auditor-x402)
x402
Base Contract Generic Read (auditor-x402) is a paid API for AI agents from auditor-x402.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).
Executes any read-only (view) function on any Base contract by accepting a contract address and raw hex calldata, returning raw bytes plus best-effort decoded values.
Price / call$0.003
Success—
StatusUnknown
How this service works
Generic read-only call to any contract on Base: provide an address and hex calldata (4-byte selector, e.g. 0x18160ddd = totalSupply, optionally followed by ABI-encoded args) and get the raw return data plus best-effort uint/address/bool/string decoding. Read-only (never sends a transaction). Use this for arbitrary view functions not covered by a dedicated tool.
Output
Returns the raw hex return data from the contract call, along with best-effort decoded values: uint256, address, bool, and string interpretations of the bytes, so the agent can use whichever type fits the function's actual return type.
Example use cases
Check ERC-20 total supply
“What's the total supply of the token at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base? Use the totalSupply selector 0x18160ddd.”
Read custom governance parameter
“I need to read the `quorumVotes()` function (selector 0x24bc1a64) from the governance contract at 0x35d9026F3871C8f9774B6E5bFEa5e00b1e2d8A3 on Base — what does it return?”
Inspect NFT ownership on-chain
“Who owns token ID 42 on the NFT contract at 0x5180db8F5c931aaE63c74a882a88B5D0c3eFA8C on Base? The ownerOf selector is 0x6352211e and the arg is ABI-encoded 42.”
Technical details
Endpoint
POSThttps://auditor-x402.onrender.com/api/contract-read?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to call any arbitrary view function on a Base contract that is not covered by the dedicated tools (e.g. not ERC-20 balance, not Aave rates, not Uniswap pricing). It is the Swiss-army-knife fallback for any read-only on-chain call — ideal for non-standard getter functions, custom governance contracts, or any function you can express as a 4-byte selector plus ABI-encoded args.
Side effects
- Invalid contract address returns an error or empty bytes
- Wrong or mismatched calldata selector causes a revert or garbled decode
- Contract not deployed on Base returns execution error
- Encoding mismatch in ABI arguments causes revert
- Service temporarily unavailable (Render cold-start delay)
- Payment of 0.003 USDC required; missing payment causes 402 rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | string | Hex calldata starting with a 4-byte function selector (e.g. "0x18160ddd") |
| address | string | Contract address (0x...) on Base |
Tags
x402
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