Resolve Uniswap V3 pool address

Look up the Uniswap V3 pool address for a token pair + fee tier on Ethereum, Base, Polygon, Arbitrum, or Optimism. Pass either order (tokenA/tokenB) — the factory sorts internally. Returns 0x0…0 if no pool has been deployed for that combination yet.

Input

Field	Type	Description
tokenA *	string	0x-prefixed ERC-20 contract address.
tokenB *	string	0x-prefixed ERC-20 contract address (other side of the pair).
fee *	number	Fee tier in 1e-6 units: 100, 500, 3000, or 10000 (0.01% / 0.05% / 0.30% / 1.00%).
network	string	ethereum / base / polygon / arbitrum / optimism (default base).

Example output

{
  "network": "base",
  "tokenA": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
  "tokenB": "0x4200000000000000000000000000000000000006",
  "fee": 500,
  "poolAddress": "0xd0b53d9277642d899df5c87a3966a349a798f224"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/dex-pair \
  -H "Content-Type: application/json" \
  -d '{"tokenA":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","tokenB":"0x4200000000000000000000000000000000000006","fee":500,"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-pair", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "tokenA": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "tokenB": "0x4200000000000000000000000000000000000006",
    "fee": 500,
    "network": "base"
  }),
});

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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