# SYNTHORA eth_getCode Contract Checker

> SYNTHORA eth_getCode Contract Checker is a paid API for AI agents from rpc-code.hergertsynthora.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Checks whether an Ethereum address is a smart contract (vs EOA) using eth_getCode, with EIP-7702 delegation detection, returning a signed deterministic result

## Facts

- Endpoint: POST https://rpc-code.hergertsynthora.com/service
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-eth-getcode-contract-checker-cfaef85e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hGB0C7xX3CyTAoQ78K8GA

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 synthora-eth-getcode-contract-checker-cfaef85e -d '<json body>'
```

Example prompt: Can you check if 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 is a smart contract on Ethereum mainnet — I want to know if it has deployed bytecode or if it's an EIP-7702 delegated account?

## When to prefer this

Use this endpoint when you need a cryptographically signed, deterministic answer about whether an address is a contract or EOA on a supported EVM chain, especially when EIP-7702 delegation detection matters. Prefer this over generic RPC calls when you need auditability via Ed25519 signatures, or when integrating into an x402-payment-enabled pipeline on Base.

## Known failure modes

- Invalid or malformed Ethereum address returns an error
- Unsupported or unknown chain identifier causes a failure
- Upstream RPC node failure returns no result and incurs no charge
- Missing or invalid X-WALLET header may block access after the 3 free calls
- Malformed POST body missing required fields returns validation error

## How this service works

Check if an address is a contract via eth_getCode, with EIP-7702 delegation detection. Deterministic, Ed25519-signed.

## Output

Returns whether the address has deployed bytecode (i.e. is a contract), whether it is an EIP-7702 delegated EOA, and a deterministic Ed25519-signed response confirming the result's authenticity. No result is returned and no charge is made on upstream RPC failure.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "address"
 ],
 "properties": {
  "chain": {
   "type": "string",
   "description": "chain"
  },
  "address": {
   "type": "string",
   "description": "address"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-eth-getcode-contract-checker-cfaef85e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rpc-code.hergertsynthora.com](https://www.zero.xyz/host/rpc-code.hergertsynthora.com/llms.txt)