ToolVet
78trust / 100

Quote

by Flow in Onchain & crypto

x402 APIPassing, checked 53 min ago

Use when an agent is about to swap on Base and needs the best executable price before committing funds. Flow best-execution quotes: compares Uniswap V3 and Aerodrome across fee tiers and returns the best venue, expected output, edge vs Uniswap baseline, block number, and an expiry window so the agent knows exactly how long the price holds.

POST
https://flow-kg4x.vercel.app/api/quote
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
388 ms
508 ms slowest 5%
Last check
Passed
53 min ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://flow-kg4x.vercel.app/api/quote

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.

POST https://flow-kg4x.vercel.app/api/quote
content-type: application/json

{
  "amountIn": "1000000",
  "tokenIn": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "tokenOut": "0x4200000000000000000000000000000000000006"
}

Example response

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

{
  "bestOut": "396812",
  "edgeBps": 12,
  "protocolFee": "25% of price improvement over Uniswap baseline",
  "venue": "aerodrome"
}

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 -X POST 'https://flow-kg4x.vercel.app/api/quote' \
  -H 'content-type: application/json' \
  --data-raw '{"amountIn":"1000000","tokenIn":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","tokenOut":"0x4200000000000000000000000000000000000006"}'

# 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 - -X POST 'https://flow-kg4x.vercel.app/api/quote' \
  -H 'content-type: application/json' \
  --data-raw '{"amountIn":"1000000","tokenIn":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","tokenOut":"0x4200000000000000000000000000000000000006"}' \
  | 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%2Fflow-kg4x.vercel.app%2Fapi%2Fquote&method=POST
const res = await pay("https://flow-kg4x.vercel.app/api/quote", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "amountIn": "1000000",
    "tokenIn": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "tokenOut": "0x4200000000000000000000000000000000000006"
  }),
});
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.post(
        "https://flow-kg4x.vercel.app/api/quote",
        json={
            "amountIn": "1000000",
            "tokenIn": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "tokenOut": "0x4200000000000000000000000000000000000006",
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

WhenResultHTTPTimePrice
53 min agoPassed402375 ms$0.01
6 h agoPassed402387 ms$0.01
10 h agoPassed402561 ms$0.01
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19 h agoPassed402419 ms$0.01
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