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Contract ABI & Metadata Lookup (x402)
x402
Contract ABI & Metadata Lookup (x402) is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Fetches the ABI, proxy structure, token metadata, ownership flags, and risk signals for a smart contract address on Base or Ethereum mainnet.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
Returns a JSON object containing: contract kind (e.g. ERC20), proxy details (type, admin, implementation), token name/symbol/decimals/total supply, owner address and renouncement status, supported interfaces (ERC165/721/1155), risk flags (e.g. upgradeable_proxy, has_owner, admin_can_change_logic), native ETH balance, code size in bytes, chain ID, and suggested follow-up endpoint paths.
Example use cases
Pre-trade token contract due diligence
“Before I swap into this token at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, can you check if the contract is upgradeable, who controls it, and whether the owner has been renounced?”
Classify unknown contract type
“I found this contract address 0x4200000000000000000000000000000000000006 on Base — can you tell me what kind of contract it is, whether it's an ERC20 or something else, and pull its token details?”
Detect proxy admin risk before integration
“Check contract 0x2Ce6311ddAe708829bc0784C967b7d77D19Fd779 on Ethereum mainnet and tell me if it's behind a proxy, who the admin is, and what risk flags are present.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/contract-abi?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to understand the structure and risk profile of a smart contract before interacting with it — especially for ERC20 tokens on Base or Ethereum. Prefer this over generic blockchain explorers when you need machine-readable ABI classification, proxy unwrapping, and risk flags in a single pay-per-call response with no API key setup.
Side effects
- Invalid address format (not 0x + 40 hex chars) returns validation error
- Address is an EOA (externally owned account), not a contract — is_contract: false
- Contract not deployed on the specified chain — empty or null response
- Chain param not in allowed enum (base, eth) returns 400
- Payment failure via x402 (insufficient USDC balance) returns 402 before data is served
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "ERC20",
"next": [
"/crypto/token-risk?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"/crypto/allowance?owner=&spender="
],
"safe": null,
"chain": "base",
"flags": [
"upgradeable_proxy",
"has_owner",
"admin_can_change_logic"
],
"owner": "0x...",
"proxy": {
"type": "ZEPPELINOS_LEGACY",
"admin": "0x4fc7850364958d97b4d3f5a08f79db2493f8ca44",
"beacon": null,
"is_proxy": true,
"implementation": "0x2ce6311ddae708829bc0784c967b7d77d19fd779"
},
"token": {
"name": "USD Coin",
"symbol": "USDC",
"decimals": 6,
"total_supply": 4100000000
},
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"summary": "ERC20 USDC behind ZEPPELINOS_LEGACY proxy, has owner",
"chain_id": 8453,
"checked_at": "2026-10-30T03:40:00Z",
"interfaces": {
"erc165": false,
"erc721": false,
"erc1155": false
},
"is_contract": true,
"native_balance": 0,
"code_size_bytes": 1852,
"owner_renounced": false
}
}Tags
x402
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