{"uid":"cap_P2Y-dWQ7MQxinyocZlBrB","slug":"saylor-innovations-on-chain-lookups-read-only-contract-call-optimism-3e0d18b2","name":"Saylor Innovations On-Chain Lookups — Read-Only Contract Call (Optimism)","description":"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.","url":"https://saylorinnovations.com/api/evm/optimism/call/:address?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","POST","PUT","PATCH","DELETE","HEAD"],"type":"string"},"queryParams":{"type":"object","properties":{"data":{"type":"string","description":"0x ABI-encoded calldata (query)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["chain","contract","reverted"],"properties":{"chain":{"type":"string"},"error":{"type":["string","null"]},"result":{"type":["string","null"]},"contract":{"type":"string"},"reverted":{"type":"boolean"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Ogjw6izte23KqYGgZxsTM","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Executes a read-only eth_call against any smart contract on the Optimism network and returns the ABI-encoded result","exampleAgentPrompt":"Can you call the balanceOf function on the Optimism contract at 0x4200000000000000000000000000000000000042 — use the ABI-encoded calldata for my wallet address 0xAbCd1234...5678 and tell me what it returns?","exampleUseCases":[{"title":"Check ERC-20 token balance on Optimism","prompt":"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?"},{"title":"Read DeFi protocol reserve data","prompt":"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?"},{"title":"Verify NFT ownership on Optimism","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T03:54:15.814Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-on-chain-lookups-read-only-contract-call-optimism-3e0d18b2"}