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Foundry Base Contract Fact Sheet
x402
Foundry Base Contract Fact Sheet is a paid API for AI agents from minty-sprout.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-01).
Returns raw on-chain facts about a Base network smart contract: proxy type, ownership, privileged powers in bytecode, ERC-20 token metadata, and current paused state — no verdict, just facts.
Price / call$0.005
Success—
StatusUnknown
How this service works
Base contract fact sheet from the chain: is it a contract, proxy type (EIP-1967, beacon, EIP-1167 clone, ZeppelinOS) with implementation and admin, owner and whether ownership is renounced or held by a contract (multisig) or single key, privileged powers found in bytecode (mint, pause, blacklist, fee/tax setters, trading switch, tx limits, upgrade), current paused state, ERC-20 name/symbol/decimals/supply. Facts only, no verdict. Input: 0x address.
Output
A JSON object containing: whether the address is a contract, proxy type (EIP-1967, beacon, EIP-1167 clone, ZeppelinOS, or none) with admin and implementation addresses, owner address and flags for whether ownership is renounced or held by a contract vs EOA, list of privileged powers found in bytecode (mint, pause, blacklist, fee/tax setters, trading switch, tx limits, upgrade), current paused state, ERC-20 token name/symbol/decimals/total_supply, code size in bytes, and a list of plain-English observations highlighting notable risks or patterns.
Example use cases
DeFi token safety pre-check
“Before I ape into this token, can you check the Base contract at 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA and tell me if it has mint, pause, blacklist, or upgrade powers, and whether the owner is a multisig or a single key?”
Proxy upgrade risk assessment
“I need to know if the contract at 0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22 on Base is an upgradeable proxy — what type, who's the admin, and what's the current implementation address?”
Token metadata lookup for analytics
“What are the ERC-20 name, symbol, decimals, and total supply for the Base contract at 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb, and is it currently paused?”
Technical details
Endpoint
POSThttps://minty-sprout.onrender.com/v1/base-contract-facts?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need raw, objective on-chain facts about a Base network contract with no opinion layer — ideal for pre-investment due diligence, automated token screening, proxy audit, or feeding structured contract data into a downstream risk-scoring agent. Prefer this over block explorer APIs when you need structured JSON with power detection, proxy type classification, and ownership flags in a single call.
Side effects
- Invalid or non-hex address returns an error response
- Address is an EOA (not a contract) — is_contract=false, other fields absent
- Contract not deployed on Base mainnet — empty or error response
- Network or RPC timeout on the Base node — 5xx or timeout error
- Address is a contract but not ERC-20 — token fields will be null or absent
- Proxy implementation not readable — implementation address may be null
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | Base contract address, 0x + 40 hex characters |
Output
Schema · Response
{
"type": "json",
"example": {
"proxy": {
"type": "zeppelinos",
"admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
"implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
"token": {
"name": "USD Coin",
"symbol": "USDC",
"decimals": 6,
"total_supply": 4290041494.13
},
"paused": false,
"powers": [
"blacklist",
"burn",
"mint",
"ownership",
"pause",
"upgrade"
],
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"control": {
"owner": "0x3ABd6f64A422225E61E435baE41db12096106df7",
"owner_is_contract": false,
"ownership_renounced": false
},
"code_size": 1852,
"is_contract": true,
"observations": [
"upgradeable proxy: logic can be replaced (admin is an externally owned account)",
"owner-side mint function present: supply can grow",
"pause function present: transfers can be frozen"
]
}
}Tags
x402
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