{"id":71436,"recorded_at":"2026-10-26T14:38:02.150860Z","observed_at":"2026-10-26T14:38:02.150824Z","subject_kind":"source_record","subject":"x402_bazaar:https://base-facts.yankii.fr/v1/sellcheck","kind":"listing","method":"baseline/1","body":{"endpoints":[["x402","https://base-facts.yankii.fr/v1/sellcheck"]],"name":"Base Token Sell Check","owner_address":"0x40661d56c2bf416c5946a8b21098eaf8d33459a2","raw":{"accepts":[{"amount":"5000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"maxTimeoutSeconds":300,"network":"eip155:8453","payTo":"0x40661D56c2Bf416c5946A8b21098eaF8D33459A2","scheme":"exact"}],"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. $0.005. Simulation at one block, not a guarantee.","extensions":{"bazaar":{"info":{"input":{"body":{"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"},"bodyType":"json","method":"POST","type":"http"},"output":{"example":{"blockNumber":"52159737","disclaimer":"eth_call simulation at block 52159737: a small buy with WETH and an immediate sell on the token's deepest WETH pools. Not a guarantee: the token's code or owner can change, and some tokens treat addresses or sizes differently. Not financial advice.","flags":[{"fact":"Bought with 0.01 WETH and sold straight back on uniswap-v3 pool 0x6c561B446416E1A00E8E93E221854d6eA4171372 at block 52159737 (eth_call simulation): round-trip loss 0.6%, which includes a 0.30% pool fee paid twice and any token tax.","id":"sell_ok","severity":"info"}],"name":"USD Coin","simulation":{"amounts":{"tokenReachedPool":null,"tokenReceived":"26912247","tokenReleasedByPool":"26912247","tokenSent":"26912247","wethOut":"9940089592377343"},"attempts":[{"dex":"uniswap-v3","fee":3000,"ok":true,"pool":"0x6c561B446416E1A00E8E93E221854d6eA4171372","wethIn":"10000000000000000"}],"buyTaxPct":0,"dex":"uniswap-v3","fee":3000,"pool":"0x6c561B446416E1A00E8E93E221854d6eA4171372","roundTripLossPct":0.6,"sellTaxPct":null,"status":"ok","wethIn":"10000000000000000"},"source":"base-mainnet-rpc","summary":"USDC: Simulated buy and sell on uniswap-v3: no transfer tax, round-trip loss 0.6%.","symbol":"USDC","token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"},"type":"json"}},"schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"token":{"description":"Token contract address (0x-prefixed hex, 20 bytes)","type":"string"}},"required":["token"],"type":"object"},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"blockNumber":{"type":"string"},"disclaimer":{"type":"string"},"flags":{"items":{"properties":{"fact":{"description":"The on-chain observation behind the flag","type":"string"},"id":{"enum":["not_erc20","upgradeable_proxy","owner_not_renounced","can_mint","can_pause","can_blacklist","no_liquidity","thin_liquidity","deep_liquidity","v4_liquidity_unmeasured","v4_pool_empty","sell_ok","buy_tax","sell_tax","high_round_trip_loss","sell_reverted","buy_reverted","not_simulated"],"type":"string"},"severity":{"enum":["info","warn","high"],"type":"string"}},"type":"object"},"type":"array"},"name":{"type":["string","null"]},"simulation":{"description":"eth_call buy-and-sell simulation at the verdict's block; null when the address is not an ERC20","properties":{"amounts":{"properties":{"tokenReachedPool":{"type":["string","null"]},"tokenReceived":{"type":"string"},"tokenReleasedByPool":{"type":"string"},"tokenSent":{"type":"string"},"wethOut":{"type":"string"}},"type":"object"},"attempts":{"items":{"properties":{"dex":{"type":"string"},"fee":{"type":["integer","null"]},"leg":{"enum":["buy","sell","unknown"],"type":"string"},"ok":{"type":"boolean"},"pool":{"type":"string"},"revertReason":{"type":"string"},"wethIn":{"type":"string"}},"type":"object"},"type":"array"},"buyTaxPct":{"type":["number","null"]},"dex":{"enum":["uniswap-v2","uniswap-v3","aerodrome-volatile","uniswap-v4"],"type":"string"},"fee":{"description":"Uniswap fee in hundredths of a basis point (500 = 0.05%)","type":["integer","null"]},"hooks":{"type":"string"},"pool":{"type":"string"},"reason":{"description":"Why the simulation was not run (status not_simulated)","type":"string"},"roundTripLossPct":{"description":"WETH lost buying and selling straight back, pool fees included","type":"number"},"sellTaxPct":{"description":"null on Uniswap v3 (not measurable)","type":["number","null"]},"status":{"enum":["ok","sell_reverted","buy_reverted","not_simulated"],"type":"string"},"wethIn":{"description":"WETH wei used for the simulated buy","type":"string"}},"type":["object","null"]},"source":{"type":"string"},"summary":{"type":"string"},"symbol":{"type":["string","null"]},"token":{"type":"string"}},"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"}}},"lastUpdated":"2026-10-15T07:28:08.964Z","quality":{"l30DaysTotalCalls":4,"l30DaysUniquePayers":4,"lastCalledAt":"2026-10-15T07:28:08.433Z"},"resource":"https://base-facts.yankii.fr/v1/sellcheck","serviceName":"Base Token Sell Check","tags":["base","token","honeypot","tax","sell"],"type":"http","x402Version":2},"source":"x402_bazaar","summary":"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."},"body_sha256":"5e3d1a8a0a7e1e68e714a42bea0c65cb1b1b45cf2f3d102df7fd9307189fea0c","prev_id":null,"leaf":"0x01f9cacf2d4146e52d8d096105d554384d491f81aa9b1743a48c15cefbdf4e0a","leaf_text":"{\"body\":\"5e3d1a8a0a7e1e68e714a42bea0c65cb1b1b45cf2f3d102df7fd9307189fea0c\",\"id\":71436,\"kind\":\"listing\",\"method\":\"baseline/1\",\"observed_us\":1793025482150824,\"prev\":null,\"subject\":\"x402_bazaar:https://base-facts.yankii.fr/v1/sellcheck\",\"subject_kind\":\"source_record\"}","day":{"day":"2026-10-26","leaves":296695,"root":"0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8","chained":"0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a","anchor_chain":"eip155:5042002","anchor_tx":"0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae","anchor_block":69251483},"proof":["0x01f9aa606ff9bf56d5221c6964a9c2112d22c89bc91cd2a1467f6e827866e7b2","0x206239a0068972d7842e6e3559f829e9d5a0327af2a4e18b9d5ecdb05df6e475","0x82efbb1dc5b1038022efd1fd85babafc1e2206b82712af52d657f03643ae5e7e","0x50aad7ca45739ff4a1f3fbdae26db9d5b99be945af2fb20d1fdc595c9af217c0","0xcf486ffa4f45dbe13543a53cf9e75c7cf720ffb816ab0ed9e36c24d76032823c","0xd8be0e98b3c0cda1cb9fc7ef8cbd802f52be9eb7fc8cbac360e9e4bb41a4d402","0x62cb7ea79920c8be33ba6c0ad5d163b945cce94daa58018116a9f0eb5162fe43","0x0451a97eb9042c698e9901e1c19be7893e3d938ae0dd71404fa28f7469d4a1be","0xc1892e1f31516991ebd2b68b1883c63619880797be155d4c7f6ef90340e294aa","0xb59ab9723c94bb11211a69aab135061f373122c6fca8c5dbfd525237ac1ef164","0x588f372bbaaf730e538542f070b005c0dd23fdb8c7f43a940481de0c1681aae1","0xd75ede2689ed83bbc8980becaf4f32a77c7e05567790cd351e997bb28aa0844c","0x92ff7d176556ddbe3d885e2ab73948b14a6aa3568a8fd237427d4f8415235a23","0xd1d3499072edb10edc68f84bcae2365d2ab534df689250cab18c751b6f13b6ff","0x7ddc2fead128357f881b63e6c7c26d7fbbb84fca6c7c8e0bbfe386de86ca8d39","0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e","0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13","0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d","0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a"]}