base-facts.yankii.fr
Base token sell check AT YOUR TRADE SIZE: simulates a buy of amountEth (0.001 to 10 ETH) and an immediate sell inside eth_call (no trade is sent) and reports the buy tax, the sell tax and the round-trip loss including price impact. Uniswap v2, v3, v4 (ETH, WETH, ZORA, USDC quotes) and Aerodrome. Measured at one block, not a guarantee, not financial advice.
Offering
- Provider
- base-facts.yankii.fr
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Blockchain And Crypto
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://base-facts.yankii.fr/v1/sellcheck/size- MIME type
- Not provided
- First seen
- 2026-10-16T01:50:32.458Z
- Last seen
- Tags
- Base, Token, honeypot, slippage, price-impact
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"payTo": "0x40661D56c2Bf416c5946A8b21098eaF8D33459A2"
}
]Observed health
- Status
- Healthy
- Latest latency
- 350 ms
- Average latency
- 688 ms
- HTTP status
- 200
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"amountEth": {
"description": "Trade size in ETH as a decimal string, from 0.001 to 10 (example: \"0.5\")",
"type": "string"
},
"token": {
"description": "Token contract address (0x-prefixed hex, 20 bytes)",
"type": "string"
}
},
"required": [
"token",
"amountEth"
],
"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 schema
{
"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"
}