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kair-os.trade Uniswap V3 Base Swap Quote Comparator
x402
kair-os.trade Uniswap V3 Base Swap Quote Comparator is a paid API for AI agents from kair-os.trade, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).
Fetches and compares four Uniswap V3 single-pool exact-input swap quotes on Base for a given token pair and input amount, returning raw output amounts and gas estimates without executing any swap.
Price / call$0.01
Success—
StatusUnknown
How this service works
Compare four Uniswap V3 single-pool exact-input swap quotes on Base at one block (latest by default, finalized optional). Returns raw token amounts and QuoterV2 gas estimates. Gross output comparison; execution costs and net ranking remain unknown. Does not execute swaps.
Output
Returns four Uniswap V3 single-pool exact-input swap quotes for the specified token pair and input amount on Base, including raw output token amounts and QuoterV2 gas estimates per pool. Does not rank by net value after execution costs; only gross output amounts are provided. Results are anchored to either the latest or finalized block as requested.
Example use cases
Pre-trade best rate check
“Before I swap, check all four Uniswap V3 pool quotes on Base for converting 500000000 raw USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) to WETH (0x4200000000000000000000000000000000000006) at the latest block, and tell me which pool gives the most output tokens.”
Finalized block quote for audit
“Get me Uniswap V3 swap quotes on Base for 1000000000000000000 raw WETH (0x4200000000000000000000000000000000000006) going into USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) but use the finalized block so the numbers are settled — I need the raw amounts and gas estimates from all four pools.”
Gas cost comparison across pools
“I want to see the QuoterV2 gas estimates for all four Uniswap V3 pools on Base when swapping 2000000000 raw USDT (0xfde4C96c8593536E31F229EA8f37b2ADa2699bb2) to WETH (0x4200000000000000000000000000000000000006) at latest block — I'm trying to figure out which pool is cheapest on gas.”
Technical details
Endpoint
POSThttps://kair-os.trade/base-quotes/quote?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to compare multiple Uniswap V3 pool quotes on Base before deciding on a swap route, especially when you want raw QuoterV2 gas estimates alongside output amounts. Prefer it over single-pool quoters when route selection matters, or when you want finality guarantees via the 'finalized' blockTag. Not suitable for actually executing swaps or for getting net-cost-ranked recommendations.
Side effects
- Invalid token address format (not a valid 0x hex address) returns validation error
- tokenIn equals tokenOut causes rejection
- amountIn of zero or non-numeric string returns error
- No liquidity in any pool for the token pair results in empty or failed quotes
- Block tag value outside 'latest' or 'finalized' enum rejected
- Rate limit or upstream RPC failure returns 5xx error
- Malformed request body returns 400 with schema validation details
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenIn | string | Nonzero Base token contract address; must differ from tokenOut. |
| amountIn | string | Raw input-token units as a positive decimal string, at most 340282366920938463463374607431768211455. Decimals are never inferred. |
| blockTag | string | Block state to quote. Latest favors freshness; finalized favors finality. |
| tokenOut | string | Nonzero Base token contract address; must differ from tokenIn. |
Tags
x402
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