Nansen Examples

import {
  clusterApiUrl,
  Connection,
  Keypair,
  PublicKey,
} from "@solana/web3.js";
import { createLocalWallet } from "@faremeter/wallet-solana";
import { lookupKnownSPLToken } from "@faremeter/info/solana";
import {
  createPaymentHandler,
} from "@faremeter/payment-solana/exact";
import { wrap as wrapFetch } from "@faremeter/fetch";

// Load keypair from environment
const { PAYER_KEYPAIR } = process.env;
if (!PAYER_KEYPAIR) throw new Error("PAYER_KEYPAIR must be set");

const network = "mainnet-beta";

// Lookup USDC mint address automatically
const usdcInfo = lookupKnownSPLToken(network, "USDC");
if (!usdcInfo) throw new Error("Could not find USDC mint");

const keypair = Keypair.fromSecretKey(
  Uint8Array.from(JSON.parse(PAYER_KEYPAIR)),
);
const connection = new Connection(clusterApiUrl(network));
const mint = new PublicKey(usdcInfo.address);

const wallet = await createLocalWallet(network, keypair);
const fetchWithPayer = wrapFetch(fetch, {
  handlers: [createPaymentHandler(wallet, mint, connection)],
});

const url = "https://nansen.api.corbits.dev/api/v1/smart-money/netflow";

const payload = {
  chains: [
    "ethereum",
    "solana"
  ],
  filters: {
    exclude_smart_money_labels: [
      "30D Smart Trader"
    ],
    include_native_tokens: false,
    include_smart_money_labels: [
      "Fund",
      "Smart Trader"
    ],
    include_stablecoins: false
  },
  pagination: {
    page: 1,
    per_page: 10
  },
  order_by: [
    {
      field: "chain",
      direction: "ASC"
    }
  ]
};

const response = await fetchWithPayer(url, {
  method: "POST",
  headers: {
    Accept: "application/json",
    "Content-Type": "application/json",
  },
  body: JSON.stringify(payload),
});

if (!response.ok) {
  const text = await response.text().catch(() => "");
  throw new Error(`HTTP ${response.status} ${response.statusText} ${text}`);
}

const data = await response.json();
console.log("Smart Money Net Flow:", JSON.stringify(data, null, 2));