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Saylor Innovations On-Chain Lookups — Read-Only Contract Call (Optimism)
x402
Saylor Innovations On-Chain Lookups — Read-Only Contract Call (Optimism) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).
Executes a read-only eth_call against any smart contract on the Optimism network and returns the ABI-encoded result
Price / call$0.003
Success—
StatusUnknown
How this service works
Read-Only Contract Call (eth_call) (optimism). Optimism read-only contract call (eth_call) with ?data= calldata, optional ?from= and ?block=; reverts reported cleanly with revert data.
Output
Returns a JSON object containing the chain name ('optimism'), the contract address queried, the hex-encoded result string (or null if reverted), a boolean indicating whether the call reverted, and an optional error message string. The result field is the raw ABI-encoded return value that must be decoded client-side.
Example use cases
Check ERC-20 token balance on Optimism
“I need to check how many tokens address 0xAbCd1234...5678 holds in the Optimism ERC-20 contract at 0x7F5c764cBc14f9669B88837ca1490cCa17c31607 — can you do a read-only call using the balanceOf ABI encoding?”
Read DeFi protocol reserve data
“Can you query the Optimism Aave lending pool contract at 0x794a61358D6845594F94dc1DB02A252b5b4814aD and call getReserveData with the ABI-encoded input for USDC, so I can see the current liquidity and rates?”
Verify NFT ownership on Optimism
“Check whether wallet 0xDeadBeef...1234 owns token ID 42 on the Optimism NFT contract at 0x3b4964E1b05e31bA5e7dD7A4b5c3C5a1Bb3fA91 — call ownerOf with the right ABI-encoded calldata and return the result.”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/evm/optimism/call/:address?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to perform a read-only smart contract call specifically on the Optimism L2 network. It is ideal for querying contract state, reading token balances, fetching DeFi protocol parameters, or verifying NFT ownership without broadcasting a transaction. Prefer this over generic RPC providers when you need a pay-per-call, agent-friendly API that handles Optimism node connectivity for you. Use sibling endpoints for other chains (Base, Ethereum, Arbitrum, Polygon).
Side effects
- Contract revert: reverted=true with an error message if the contract function reverts (e.g. invalid input or state condition)
- Invalid address: malformed contract address in the URL path returns an error
- Bad calldata: malformed or incorrect ABI-encoded data in the 'data' query param may cause a revert or unexpected result
- Contract not deployed: calling a non-existent contract on Optimism returns a null result or revert
- Network unavailable: upstream Optimism node issues may return a 5xx error
- Payment failure: missing or invalid x402 payment header results in a 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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