Uniswap V3 spot quote

Spot quote for swapping through a Uniswap V3 pool at the current tick. amountIn is in human units (not wei). zeroForOne=true sends token0 → token1; false sends token1 → token0. Returns amountOut net of the pool's fee tier. NOTE: this is a single-tick spot quote - slippage from depleting concentrated liquidity is NOT modeled. Use for indicative pricing; for production swaps quote against the Uniswap SDK.

Input

Example output

{
  "network": "base",
  "poolAddress": "0xd0b53d9277642d899df5c87a3966a349a798f224",
  "amountIn": 1,
  "zeroForOne": true,
  "fee": 500,
  "spotPrice_1per0": 3500.05,
  "amountOut": 3498.3,
  "note": "spot quote at current tick - no multi-tick swap simulation"
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/dex-quote \
  -H "Content-Type: application/json" \
  -d '{"poolAddress":"0xd0b53d9277642d899df5c87a3966a349a798f224","amountIn":1,"zeroForOne":true,"network":"base"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/dex-quote", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "poolAddress": "0xd0b53d9277642d899df5c87a3966a349a798f224",
    "amountIn": 1,
    "zeroForOne": true,
    "network": "base"
  }),
});

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