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Base Token Facts API
x402
Base Token Facts API is a paid API for AI agents from base-facts.yankii.fr, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Returns on-chain metadata and analysis for a given ERC-20 token contract on the Base blockchain, including name, symbol, decimals, supply, proxy status, and detected admin functions.
Price / call$0.005
Success—
StatusUnknown
How this service works
Get on-chain facts about a Base token contract
Output
A JSON object containing: ERC-20 token metadata (name, symbol, decimals, totalSupply), the contract owner address, proxy details (isProxy, standard such as ZeppelinOS, implementation address), whether the address is a contract, the contract type (e.g. ERC20), the block number at which the data was fetched, the data source (base-mainnet-rpc), and a map of detected admin functions (burn, mint, owner, pause, blacklist).
Example use cases
DeFi due diligence on new token
“Before I ape into this new Base token, can you check the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and tell me if it's mintable, pausable, or has a blacklist — and whether it's behind a proxy?”
Security audit of a suspicious token
“Someone sent me tokens from contract 0x4200000000000000000000000000000000000006 on Base — can you check if it's a legitimate ERC-20, who owns it, and what admin powers the deployer has like burn or blacklist?”
Verify proxy implementation for a token upgrade
“I need to verify whether the Base token at 0x2Ce6311ddAE708829bc0784C967b7d77D19FD779 is a proxy contract and what implementation address it points to — and what proxy standard it uses.”
Technical details
Endpoint
POSThttps://base-facts.yankii.fr/v1/facts?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need authoritative on-chain facts about a specific token contract deployed on the Base network, especially when you need proxy architecture details, admin function detection (mint, burn, pause, blacklist), and owner information in a single call. Prefer this over generic block explorers when you need structured, machine-readable output suitable for automated DeFi risk assessment or smart contract auditing workflows on Base specifically.
Side effects
- Invalid or non-0x-prefixed address returns an error or empty result
- Address is an EOA (not a contract) — isContract may be false and ERC-20 fields may be absent
- Token is not ERC-20 compliant — contractType may be unknown or fields may be null
- RPC timeout or Base network congestion causing slow or failed response
- Non-Base-network contract addresses will not return meaningful results
- Unverified or minimal contracts may return sparse admin function data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | Token contract address (0x-prefixed hex, 20 bytes) |
Output
Schema · Response
{
"type": "json",
"example": {
"erc20": {
"name": "USD Coin",
"symbol": "USDC",
"decimals": 6,
"totalSupply": "4375220680762469"
},
"owner": "0x3ABd6f64A422225E61E435baE41db12096106df7",
"proxy": {
"isProxy": true,
"standard": "ZeppelinOS",
"implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
"source": "base-mainnet-rpc",
"isContract": true,
"blockNumber": "52125591",
"contractType": "ERC20",
"adminFunctionsDetected": {
"burn": true,
"mint": true,
"owner": true,
"pause": true,
"blacklist": true
}
}
}Tags
x402
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