ToolVet
78trust / 100

Base Swap

by Base Swap in Onchain & crypto

x402 APIPassing, checked 1 h ago

An executable swap on Base, routed by 0x across Uniswap, Aerodrome, Balancer, Curve and more. Returns the transaction for your own wallet to sign, plus the approval step if needed, minimum out, route and fees. We never hold funds. Name tokens as ETH, USDC, WETH, cbBTC, AERO… or a 0x address; buying an unknown token runs a sellability check first and refuses a honeypot unless force=1.

GET https://402.com.tr/api/x402/base-swap

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
503 ms typical, 638 ms slowest 5%
Last check
1 h ago
Next check
any minute now

How to call it

GET https://402.com.tr/api/x402/base-swap

Each call costs $0.01 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://402.com.tr/api/x402/base-swap?amount=10&buy=ETH&sell=USDC&slippage=100&taker=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045

Parameters

ParameterTypeRequiredDescription
amountstringYesAmount you sell
buystringYesToken you buy
sellstringYesToken you sell
slippagestringNoSlippage in bps (optional, default 100)
takerstringYesYour wallet (signs the swap)

Example response

The provider's example. We can't check it without paying.

{
  "chain": "base",
  "checkedAt": "2026-10-08T08:46:40.081Z",
  "insufficientBalance": false,
  "routeCount": 1,
  "stepsCount": 2,
  "tokenSafety": null
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://402.com.tr/api/x402/base-swap?amount=10&buy=ETH&sell=USDC&slippage=100&taker=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://402.com.tr/api/x402/base-swap?amount=10&buy=ETH&sell=USDC&slippage=100&taker=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2F402.com.tr%2Fapi%2Fx402%2Fbase-swap
const res = await pay("https://402.com.tr/api/x402/base-swap?amount=10&buy=ETH&sell=USDC&slippage=100&taker=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://402.com.tr/api/x402/base-swap?amount=10&buy=ETH&sell=USDC&slippage=100&taker=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045")
    print(res.status_code, res.text)

Security scan

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Recent checks

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