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Northline ChainKit Address Profile
x402
Northline ChainKit Address Profile is a paid API for AI agents from northline-chainkit.northline-c86.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Returns onchain profile information for an Ethereum address on Base or Arc, including whether it is a contract, token type, proxy status, and ERC metadata.
Price / call$0.005
Success—
StatusUnknown
How this service works
x402 pay-per-call onchain API (Base + Arc).
Output
A JSON object containing the address kind (e.g. 'contract' or 'eoa'), the chain it was queried on, an array of flags such as 'upgradeable_proxy', proxy details including the EIP-1967 implementation address, and token metadata such as symbol and decimals if the address is a token contract.
Example use cases
Identify unknown contract before interaction
“Before I interact with 0x2ce6311ddae708829bc0784c967b7d77d19fd779 on Base, can you tell me what kind of address it is and whether it's an upgradeable proxy?”
Verify token contract metadata
“I need to confirm that this address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Base is a real ERC20 token — what's its symbol and decimals?”
Audit proxy implementation on Arc
“Can you pull the onchain profile for 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA on Arc and tell me what the current proxy implementation address is?”
Technical details
Endpoint
GEThttps://northline-chainkit.northline-c86.workers.dev/v1/address/profile?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call onchain lookup of an Ethereum-compatible address specifically on Base or Arc — especially when you want contract classification, proxy detection (EIP-1967), and token metadata in a single call without running your own node or indexer. Prefer this over generic block explorers when you need structured JSON output suitable for agent pipelines.
Side effects
- Invalid address format (must match ^0x[0-9a-fA-F]{40}$) returns a validation error
- Address not found or not deployed on the specified chain returns empty or null profile
- Unsupported chain value (anything other than 'base' or 'arc') returns a parameter error
- Payment failure via x402 protocol results in 402 response before query is executed
- Network or RPC timeout for the underlying chain returns a 503 or timeout error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "contract",
"chain": "base",
"flags": [
"upgradeable_proxy"
],
"proxy": {
"eip1967Implementation": "0x2ce6311ddae708829bc0784c967b7d77d19fd779"
},
"token": {
"symbol": "USDC",
"decimals": 6
}
}
}Tags
x402
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