# Saylor Innovations On-Chain Lookups – Read-Only Contract Call (eth_call) on Polygon

> Saylor Innovations On-Chain Lookups – Read-Only Contract Call (eth_call) on Polygon is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-03).

Executes a read-only smart contract call (eth_call) against a specified contract address on the Polygon network and returns the ABI-encoded result.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/polygon/call/:address?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-on-chain-lookups-read-only-contract-call-eth-call-26f5a7ad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5faJ-aB96nRWATNI7517f

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-eth-call-26f5a7ad
```

Example prompt: Can you call the balanceOf function on the USDC contract at 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174 on Polygon using the ABI-encoded calldata for my wallet address 0xAbCd...1234?

## When to prefer this

Use this endpoint when you need to read on-chain state from a Polygon (MATIC) smart contract without submitting a transaction. Prefer it over base or BSC siblings when your target contract is deployed on Polygon. It is ideal for querying ERC-20 balances, allowances, NFT ownership, DeFi pool state, or any public view/pure function result on Polygon.

## Known failure modes

- Invalid or malformed ABI-encoded calldata returns a revert with reverted:true and an error message
- Non-existent or zero-address contract returns an empty result or revert
- Network congestion or RPC node unavailability causes a timeout or 5xx error
- Incorrect contract address format (non-checksummed or invalid hex) returns a 400 error
- Calling a non-view/non-pure function that writes state will revert since eth_call is read-only

## How this service works

Read-Only Contract Call (eth_call) (polygon). Polygon 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 ('polygon'), the queried contract address, the raw hex-encoded return data from the contract call (result), a boolean indicating whether the call reverted, and an optional error message if the call failed or reverted.

## 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-eth-call-26f5a7ad/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)