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Base Token Sell Check
x402
Base Token Sell Check 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).
Simulates a buy-then-immediate-sell of a Base token on its deepest WETH pool to detect honeypots, buy/sell taxes, and round-trip losses
Price / call$0.005
Success—
StatusUnknown
How this service works
Base honeypot and tax check for trading agents: simulates a small buy and an immediate sell of the token on its deepest WETH pool (Uniswap v2/v3, Aerodrome) inside eth_call, and returns buy tax, sell tax, round-trip loss and whether the sell reverted. $0.005. Simulation at one block, not a guarantee.
Output
Returns buy tax percentage, sell tax percentage, total round-trip loss percentage, and a boolean indicating whether the sell transaction reverted — effectively classifying the token as a honeypot or flagging hidden taxes from a single-block eth_call simulation on the deepest WETH pool (Uniswap v2/v3 or Aerodrome).
Example use cases
Honeypot check before aping in
“I'm about to buy some of this new Base token at 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed — can you first simulate a buy and sell to see if it's a honeypot or has high sell tax?”
Tax-aware trading bot pre-flight
“Before my trading bot places an order, check token 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 for buy tax, sell tax, and round-trip loss so we can decide if the trade is profitable after fees.”
Flagging suspicious new token listing
“This token 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA just launched and looks sketchy — can you simulate selling it right after buying to see if the sell reverts or if there's a massive tax?”
Technical details
Endpoint
POSThttps://base-facts.yankii.fr/v1/sellcheck?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to determine if a Base chain token is safe to trade before committing real capital — specifically when you need buy/sell tax figures and honeypot detection via simulation rather than static code analysis. Prefer this over generic token scanners when you need numerical tax values (not just a pass/fail), and over the Base Token Verdict endpoint when you specifically want raw simulation data rather than a summarized risk score.
Side effects
- Token address is invalid or not 0x-prefixed — returns validation error
- Token has no WETH liquidity pool on Uniswap v2/v3 or Aerodrome — simulation cannot proceed
- Network congestion or RPC failure may cause timeout
- Simulation is at one block and may not reflect current state — taxes or restrictions may have changed
- Token uses non-standard mechanics that bypass simulation detection — false negatives possible
- Malicious contract may behave differently in eth_call vs real transaction
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | Token contract address (0x-prefixed hex, 20 bytes) |
Tags
x402
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