# Synthora Contract Metadata Lookup

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

Returns EVM smart contract metadata (name, symbol, decimals, is-contract, is-ERC20) for a given chain and address, with Ed25519-signed deterministic responses

## Facts

- Endpoint: POST https://rpc-contract.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-contract-metadata-lookup-42e03918
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WiWPm7w83gMIEdWkxkjP1

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-contract-metadata-lookup-42e03918 -d '<json body>'
```

Example prompt: Can you look up the contract metadata for address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum — I want to know its name, symbol, decimals, and whether it's an ERC20 token?

## When to prefer this

Use this endpoint when you need lightweight, signed contract metadata (name/symbol/decimals/is-ERC20) for EVM addresses without running your own node. Prefer it over generic RPC calls when you want cryptographic proof of the response via Ed25519 signature, or when cost is a concern (first 3 calls free per wallet, then $0.003 USDC).

## Known failure modes

- Invalid or non-checksummed address returns error
- Unsupported chain identifier returns error
- Upstream RPC node failure returns no charge and an error response
- Malformed request body returns 400
- Exceeded free-tier calls without wallet header may require x402 payment

## How this service works

Contract metadata: name/symbol/decimals, is-contract, is-erc20. Deterministic, Ed25519-signed.

## Output

Returns the contract's name, symbol, and decimals (for ERC20 tokens), boolean flags indicating whether the address is a deployed contract and whether it conforms to the ERC20 standard, all cryptographically signed with Ed25519 for deterministic verification.

## 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-contract-metadata-lookup-42e03918/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rpc-contract.hergertsynthora.com](https://www.zero.xyz/host/rpc-contract.hergertsynthora.com/llms.txt)