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. Send POST /api/dex-quote with the required fields poolAddress, amountIn and zeroForOne and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with network, poolAddress, amountIn, zeroForOne, fee and 3 more.

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.

Category: Crypto & onchain data · Tags: crypto uniswap dex v3 quote swap evm

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Parameters

Example request

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

Without payment this returns HTTP 402 Payment Required with the exact price for dex-quote; any x402 v2 or MPP client pays it and retries.

Example response

{
  "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"
}

From an MCP client

catalog.call {
  "slug": "dex-quote",
  "params": {
    "poolAddress": "0xd0b53d9277642d899df5c87a3966a349a798f224",
    "amountIn": 1,
    "zeroForOne": true,
    "network": "base"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for dex-quote; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• poolAddress, amountIn and zeroForOne are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/dex-quote returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
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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