# Saylor Innovations On-Chain Lookups — Read-Only Contract Call (Optimism)

> 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

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/optimism/call/:address?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-on-chain-lookups-read-only-contract-call-optimism-3e0d18b2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P2Y-dWQ7MQxinyocZlBrB

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-on-chain-lookups-read-only-contract-call-optimism-3e0d18b2
```

Example prompt: 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?

## When to prefer this

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).

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "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"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-on-chain-lookups-read-only-contract-call-optimism-3e0d18b2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)