{
  "x402Version": 2,
  "id": 35734,
  "slug": "35734",
  "resource": "https://base-facts.yankii.fr/v1/sellcheck",
  "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.",
  "type": "http",
  "serviceName": "Base Token Sell Check",
  "resourceType": "Market Data",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0x40661D56c2Bf416c5946A8b21098eaF8D33459A2",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "5000",
      "amountUsd": 0.005,
      "maxTimeoutSeconds": 300
    }
  ],
  "outputSchema": {
    "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"
  },
  "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"
      }
    }
  },
  "tags": [
    "base",
    "token",
    "honeypot",
    "tax",
    "sell",
    "bazaar"
  ],
  "sourceHost": "base-facts.yankii.fr",
  "lastUpdated": "2026-10-09T10:19:02.45Z",
  "quality": {
    "calls30d": 3,
    "uniquePayers30d": 3,
    "lastCalledAt": "2026-10-09T10:19:01.934Z"
  },
  "metadata": {
    "serviceName": "Base Token Sell Check",
    "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"
        }
      }
    }
  },
  "liveness": {
    "reliability": null
  },
  "verified": false,
  "featured": false,
  "provider": {
    "host": "base-facts.yankii.fr",
    "manifest_name": "base-facts.yankii.fr",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-10-14T01:15:01.050Z"
  },
  "exampleResponse": {
    "example": {
      "blockNumber": "string",
      "disclaimer": "string",
      "flags": [
        {
          "fact": "string",
          "id": "not_erc20",
          "severity": "info"
        }
      ],
      "name": "string",
      "simulation": {
        "amounts": {
          "tokenReachedPool": "string",
          "tokenReceived": "string",
          "tokenReleasedByPool": "string",
          "tokenSent": "string",
          "wethOut": "string"
        },
        "attempts": [
          {
            "dex": "string",
            "fee": 0,
            "leg": "buy",
            "ok": true,
            "pool": "string",
            "revertReason": "string",
            "wethIn": "string"
          }
        ],
        "buyTaxPct": 0,
        "dex": "uniswap-v2",
        "fee": 0,
        "hooks": "string",
        "pool": "string",
        "reason": "string",
        "roundTripLossPct": 0,
        "sellTaxPct": 0,
        "status": "ok",
        "wethIn": "string"
      },
      "source": "string",
      "summary": "string",
      "symbol": "string",
      "token": "string"
    },
    "type": "string"
  }
}