# x402-toolbox ETH Call

> x402-toolbox ETH Call is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Executes a deterministic Ethereum eth_call (read-only smart contract call) on-chain, payable per-call via USDC over the x402 protocol with no API key required.

## Facts

- Endpoint: GET https://x402-toolbox.shablony-pro.workers.dev/chain/eth-call?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-toolbox-eth-call-1b56cc1f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0yMa1xKNvQu4vb3gnpjDS

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 x402-toolbox-eth-call-1b56cc1f
```

Example prompt: Can you call the balanceOf view function on the USDC ERC-20 contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 for address 0x1234...abcd using the eth_call tool — pay the $0.002 fee automatically?

## When to prefer this

Prefer this endpoint when an AI agent needs to read Ethereum smart contract state without a pre-provisioned node provider API key, subscription, or identity — the $0.002 USDC x402 payment replaces authentication. Ideal for ephemeral agents, serverless workflows, or trustless on-chain lookups where signing up for Infura, Alchemy, or similar is impractical.

## Known failure modes

- Invalid schema or malformed call parameters returns an error response
- Contract revert causes eth_call to fail with revert reason
- Incorrect contract address or function selector returns empty or error data
- Payment failure via x402 prevents the call from executing
- Network congestion or RPC node downtime causes timeout

## How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

## Output

Returns a JSON object with ok and paid status flags plus the raw return data from the Ethereum eth_call, representing the on-chain response to the read-only smart contract function invocation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "schema": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-toolbox-eth-call-1b56cc1f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-toolbox.shablony-pro.workers.dev](https://www.zero.xyz/host/x402-toolbox.shablony-pro.workers.dev/llms.txt)