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OneSource Ethereum Contract Proxy Lookup
x402
OneSource Ethereum Contract Proxy Lookup is a paid API for AI agents from api.onesource.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Looks up Ethereum contract metadata (proxy status, implementation address) for a given contract address on mainnet or Sepolia testnet
Price / call$0.005
Success—
StatusUnknown
How this service works
Two data families for AI agents: live Ethereum mainnet, Sepolia testnet, and Robinhood Chain RPC reads, plus Deepstate on-chain market data (order books, trades, candles, and analytics). Pay per call or use batch/session mode: USDC on Base via x402, or pathUSD/USDC.e on Tempo via MPP. No API key required to start; a flat-rate monthly subscription is also available.
Output
Returns JSON with the queried address, whether it is a proxy contract (is_proxy boolean), the proxy pattern used (if any), and the implementation contract address it delegates to (if applicable).
Example use cases
Example prompt
“Can you check if the Ethereum contract at 0xdac17f958d2ee523a2206206994597c13d831ec7 is a proxy contract, and if so, what implementation address it points to — use Ethereum mainnet?”
Technical details
Endpoint
GEThttps://api.onesource.io/api/chain/proxy/%7Baddress%7DWhen to prefer
Use this endpoint when you need to determine if a specific Ethereum contract is a proxy and find its underlying implementation — particularly useful before calling or auditing a contract. Prefer this over generic Etherscan lookups when you want programmatic, pay-per-call access without API keys, or when building autonomous AI agent workflows that need live on-chain contract introspection on mainnet or Sepolia.
Side effects
- Invalid address format (not a valid 0x-prefixed 40-hex-char address) returns an error
- Address is an EOA (externally owned account) rather than a contract — may return is_proxy false with nulls
- Payment not provided or insufficient USDC — returns 402 Payment Required
- Network value not in allowed enum (ethereum, sepolia) causes validation error
- Contract exists but proxy detection is inconclusive — pattern and implementation may be null
Input
{
"address": "0xdac17f958d2ee523a2206206994597c13d831ec7"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"data": {
"address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
"is_proxy": true,
"proxy_type": "slot0",
"is_contract": true,
"implementation": "0xc6cde7c39eb2f0f0095f41570af89efc2c1ea828"
},
"meta": {
"endpoint": "/api/chain/proxy/0xdac17f958d2ee523a2206206994597c13d831ec7",
"request_id": "81fb01af9d6e67db"
}
}Schema · Response
{
"type": "json",
"example": {
"data": {
"admin": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
"is_proxy": true,
"proxy_type": "eip1967",
"is_contract": true,
"implementation": "0x6b175474e89094c44da98b954eedeac495271d0f"
},
"meta": {
"endpoint": "/api/chain/proxy/{address}",
"cost_usdc": "0.001",
"request_id": "00000000abcdef01",
"payment_chain": "base",
"payment_token": "USDC"
}
}
}Tags
x402
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