{"uid":"cap_yPfz7z5OMw5HR_T6fRFa1","slug":"base-token-sell-check-fd21b651","name":"Base Token Sell Check","description":"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.","url":"https://base-facts.yankii.fr/v1/sellcheck?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"token":{"type":"string","description":"Token contract address (0x-prefixed hex, 20 bytes)"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_IB-duStcvpoI_e4EKE9Ev","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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","exampleAgentPrompt":"Before I buy, can you run a sell simulation on token 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed on Base to check if it's a honeypot and what the buy and sell taxes are?","exampleUseCases":[{"title":"Honeypot check before aping in","prompt":"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?"},{"title":"Tax-aware trading bot pre-flight","prompt":"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."},{"title":"Flagging suspicious new token listing","prompt":"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?"}],"resultDescription":"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).","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:31:51.500Z","isFirstParty":false,"canonicalSlug":"base-token-sell-check-fd21b651"}