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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, $0.01/call, status unknown (last checked 2026-10-11).
Returns on-chain security facts, risk flags, and liquidity data for a given ERC-20 token contract on Base mainnet
Price / call$0.01
Success—
StatusUnknown
How this service works
Base token verdict for trading agents: risk level, score and flags (proxy, mint, pause, blacklist, owner, DEX liquidity on Uniswap v2/v3 and Aerodrome), each with the on-chain fact behind it. Facts and heuristics, not financial advice.
Output
A JSON object containing the token name, symbol, and contract address; an array of security flags each with an ID, human-readable fact, and severity (info/warn/high); an overall risk level and numeric risk score (0–100); a liquidity breakdown listing individual DEX pools with reserves and USD values; a plain-English summary; the block number at which data was read; and a disclaimer about spot data validity.
Example use cases
DeFi rug-pull safety check
“Before I ape into this new token at 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA on Base, can you check if the contract has any red flags like minting, pausing, blacklisting, or an unrenounced owner?”
Liquidity depth verification
“How much WETH-side liquidity does the token 0x4200000000000000000000000000000000000006 have across Uniswap v2, v3, and Aerodrome pools on Base?”
Portfolio risk scoring
“Give me a risk score and a summary of the security flags for 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb on Base — I need to know the overall risk level before adding it to my portfolio.”
Technical details
Endpoint
POSThttps://base-facts.yankii.fr/v1/verdict?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a comprehensive, multi-dimensional on-chain security assessment for a specific ERC-20 token on Base mainnet — combining contract-level risk flags (upgradeability, mint/pause/blacklist selectors, ownership) with real-time liquidity data across Uniswap v2/v3 and Aerodrome. Prefer it over generic block explorers when you need a structured, machine-readable verdict with severity ratings and a numeric risk score that an agent can act on programmatically.
Side effects
- Invalid or non-existent token address returns an error or empty response
- Token not deployed on Base mainnet causes lookup failure
- Non-ERC-20 contract address may return incomplete or misleading flags
- Liquidity data may be stale by one block due to spot-reserve read timing
- Network or RPC outage causes request failure
- Malformed 0x address (wrong length or non-hex) returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | Token contract address (0x-prefixed hex, 20 bytes) |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "USD Coin",
"flags": [
{
"id": "upgradeable_proxy",
"fact": "ZeppelinOS proxy: its code can be replaced; current implementation 0x2Ce6311ddAE708829bc0784C967b7d77D19FD779",
"severity": "warn"
},
{
"id": "owner_not_renounced",
"fact": "owner() returns 0x3ABd6f64A422225E61E435baE41db12096106df7",
"severity": "warn"
},
{
"id": "can_mint",
"fact": "mint(address,uint256) selector found in the implementation bytecode (heuristic)",
"severity": "warn"
},
{
"id": "can_pause",
"fact": "pause() selector found in the implementation bytecode (heuristic)",
"severity": "warn"
},
{
"id": "can_blacklist",
"fact": "a blacklist selector was found in the implementation bytecode (heuristic)",
"severity": "high"
},
{
"id": "deep_liquidity",
"fact": "WETH/USDC-side reserves in Uniswap v2/v3 and Aerodrome pools: $96,907,720 (at least $1,000,000)",
"severity": "info"
}
],
"level": "high",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"source": "base-mainnet-rpc",
"symbol": "USDC",
"summary": "USDC: High-severity: can_blacklist. Warnings: upgradeable_proxy, owner_not_renounced, can_mint, can_pause. $96,907,720 of WETH/USDC-side liquidity in 7 pool(s).",
"liquidity": {
"pools": [
{
"dex": "uniswap-v3",
"fee": 3000,
"pool": "0x6c561B446416E1A00E8E93E221854d6eA4171372",
"quote": "WETH",
"quoteReserve": "32055779596978119535815",
"tokenReserve": "76522772029843",
"quoteReserveUsd": "86078494.19"
},
{
"dex": "uniswap-v3",
"fee": 500,
"pool": "0xd0b53D9277642d899DF5C87A3966A349A798F224",
"quote": "WETH",
"quoteReserve": "1983500656279964419661",
"tokenReserve": "4598355794854",
"quoteReserveUsd": "5326239.19"
}
],
"scope": "WETH and USDC pairs on Uniswap v2, Uniswap v3 (4 fee tiers) and Aerodrome (volatile and stable)",
"wethPriceUsd": "2685.27",
"quoteLiquidityUsd": "96907719.96"
},
"riskScore": 83,
"disclaimer": "On-chain facts and heuristics read at block 52136127. Spot reserves can move within one block. Not financial advice.",
"blockNumber": "52136127"
}
}Tags
x402
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