# santyvv-data: Read-Only eth_call

> santyvv-data: Read-Only eth_call is a paid API for AI agents from santyvv-x402.santyvv1993.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Executes a read-only eth_call to any Ethereum-compatible smart contract and returns the result

## Facts

- Endpoint: POST https://santyvv-x402.santyvv1993.workers.dev/api/chain/call?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/santyvv-data-read-only-eth-call-95355800
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XAWHVvTCwbiNMZYlq6hbM

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 santyvv-data-read-only-eth-call-95355800 -d '<json body>'
```

Example prompt: Make a read-only eth_call to the Uniswap V3 USDC/ETH pool contract at 0x8ad599c3A0ff1De082011EFDDc58f1908eb6e6D8 on Ethereum mainnet using the slot0() function selector to get the current sqrtPriceX96 value.

## When to prefer this

Use this endpoint when you need to read state or computed values from any EVM-compatible smart contract without sending a transaction or paying gas. It is ideal for querying view and pure functions, fetching on-chain data for any arbitrary contract, and integrating real-time contract state into agent workflows. Prefer this over higher-level endpoints (ERC-20 balance, native balance, etc.) when you need to call a function not covered by those specialized endpoints.

## Known failure modes

- Invalid contract address returns execution error or zero bytes
- Incorrect function selector or ABI encoding results in revert or garbled output
- Calling a non-existent function on a contract returns a revert
- Contract not deployed at the given address on the specified chain returns empty response
- Network or RPC unavailability causes a 5xx error
- Insufficient USDC payment causes 402 Payment Required

## How this service works

Read-only eth_call to any contract

## Output

Returns the raw or ABI-decoded output of the specified smart contract read function — typically a hex-encoded bytes value or a decoded primitive such as a uint256, address, bool, or struct, depending on the function called. No gas is consumed and no state is changed.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/santyvv-data-read-only-eth-call-95355800/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from santyvv-x402.santyvv1993.workers.dev](https://www.zero.xyz/host/santyvv-x402.santyvv1993.workers.dev/llms.txt)