Pool Swaps

{
  "against": "WETH",
  "buys_usd": 293,
  "covered_minutes": 30,
  "dex": "aerodrome",
  "largest": [
    {
      "block": 52099782,
      "price_usd": 0.0058285059,
      "side": "sell",
      "token_amount": 49909,
      "tx": "0xa6d22cbbd29ba8d4e4c295eda92ebd98500e05e2ca869857eea2d7f388c48094",
      "usd": 290.89,
      "wallet": "0x8ea5ad2a58c1dae75394b1e8636e6518eb6dac50"
    },
    {
      "block": 52099270,
      "price_usd": 0.0058356867,
      "side": "sell",
      "token_amount": 37816.040455,
      "tx": "0xe4d203728ac07b7b8b9d4fafc1834cf252cd938405e1b35f6f75bf44ae750935",
      "usd": 220.68,
      "wallet": "0x01989c93890aed05a63d179b03424997075b6acf"
    }
  ],
  "net_flow_usd": -1049,
  "network": "base",
  "note": "The wallet is the swap recipient (sometimes a router or aggregator).",
  "pool": "0x4e829F8A5213c42535AB84AA40BD4aDCCE9cBa02",
  "recent": [
    {
      "block": 52099869,
      "price_usd": 0.0058228297,
      "side": "sell",
      "token_amount": 25795,
      "tx": "0x0192171beedfee6a262fd6363fb7ea249578cd4d2bbf7f554c9ac6e4a3d76be1",
      "usd": 150.2,
      "wallet": "0x67d03631fe51b741c0c00c4e16eb662ac84381df"
    },
    {
      "block": 52099868,
      "price_usd": 0.0058251115,
      "side": "sell",
      "token_amount": 25795,
      "tx": "0x949adf1e4617d5f2202fb9e6b6ffb15574a94986cd955e29c01be719ee6c9098",
      "usd": 150.26,
      "wallet": "0x67d03631fe51b741c0c00c4e16eb662ac84381df"
    }
  ],
  "sells_usd": 1342,
  "source": "Pool Swap events on public nodes; prices from DEX Screener",
  "token": "BRETT (0x532f27101965dd16442E59d40670FaF5eBB142E4)",
  "trades": 19,
  "unique_buyers": 3
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.vextorium.com/v1/pool-swaps' \
  -H 'content-type: application/json' \
  --data-raw '{"limit":2,"minutes":30,"network":"base","pool":"0x4e829F8A5213c42535AB84AA40BD4aDCCE9cBa02"}'

# 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://api.vextorium.com/v1/pool-swaps' \
  -H 'content-type: application/json' \
  --data-raw '{"limit":2,"minutes":30,"network":"base","pool":"0x4e829F8A5213c42535AB84AA40BD4aDCCE9cBa02"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.vextorium.com%2Fv1%2Fpool-swaps&method=POST
const res = await pay("https://api.vextorium.com/v1/pool-swaps", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "limit": 2,
    "minutes": 30,
    "network": "base",
    "pool": "0x4e829F8A5213c42535AB84AA40BD4aDCCE9cBa02"
  }),
});
console.log(res.status, await res.text());

# 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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.vextorium.com/v1/pool-swaps",
        json={
            "limit": 2,
            "minutes": 30,
            "network": "base",
            "pool": "0x4e829F8A5213c42535AB84AA40BD4aDCCE9cBa02",
        },
    )
    print(res.status_code, res.text)