base-facts.yankii.fr
x402Grade BLast checked 3 hours ago
POST https://base-facts.yankii.fr/v1/sellcheck/size
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.
Price$0.01per chain read · paid in USD on Base
Uptime100%
4/4 probes · 522 ms
Score76Grade B
Paid usage, 30 days3payers · 4 calls
How to buy
This endpoint takes pay-per-call payments over x402. Call it once without paying to see its live price; any x402 client then pays and retries automatically.
curl -i -X POST "https://base-facts.yankii.fr/v1/sellcheck/size"
# HTTP/1.1 402 Payment Required: price, asset and payTo are in the responseRecent checks
| Checked (UTC) | Result | Status | Time | Live price |
|---|---|---|---|---|
| 2026-10-11 10:01 | Valid 402 | 402 | 562 ms | $0.01 |
| 2026-10-11 05:30 | Valid 402 | 402 | 556 ms | $0.01 |
| 2026-10-11 01:15 | Valid 402 | 402 | 434 ms | $0.01 |
| 2026-10-10 20:45 | Valid 402 | 402 | 488 ms | $0.01 |
Receipts
No test purchases yet. Graded test purchases are next on our list; until then every number here comes from unpaid checks.
What a check proves