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

> Saylor Innovations On-Chain Lookups — Read-Only Contract Call (Base) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-30).

Executes a read-only eth_call against any smart contract on the Base network using ABI-encoded calldata and returns the result or revert status.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/base/call/:address?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-on-chain-lookups-read-only-contract-call-base-02c1152f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jkIsTovlBJxBHwPv-0tTf

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-base-02c1152f
```

Example prompt: Can you call the totalSupply() view function on the Base network contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and tell me what it returns? The ABI-encoded calldata for totalSupply is 0x18160ddd.

## When to prefer this

Use this endpoint when you need to read on-chain state from a specific smart contract on the Base network without sending a transaction or paying gas. Prefer this over generic Ethereum RPC providers when you want a simple pay-per-call HTTP API (x402 micropayment) without managing RPC credentials or node infrastructure. Best suited for agents that need to occasionally query Base contracts as part of a broader workflow.

## Known failure modes

- Contract address does not exist on Base — result will be null and reverted may be true
- Malformed or incorrect ABI-encoded calldata — call may revert with an error message
- Contract function is not a view/pure function — call may fail or return unexpected results
- Network congestion or RPC node unavailability — service may return an HTTP error
- Invalid address format — request validation error before reaching the chain

## How this service works

Read-Only Contract Call (eth_call) (base). Base 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 ('base'), the queried contract address, the hex-encoded return value of the call (result), a boolean indicating whether the call reverted, and an optional error string 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-base-02c1152f/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)