Smart Money Historical Holdings

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.nansen.ai/api/v1/smart-money/historical-holdings' \
  -H 'content-type: application/json' \
  --data-raw '{"chains":["ethereum"],"date_range":{"from":"2025-10-01","to":"2025-10-31"},"filters":{"balance_24h_percent_change":{"max":0.1,"min":-0.1},"exclude_smart_money_labels":["30D Smart Trader"],"include_native_tokens":false,"include_smart_money_labels":["Fund","Smart Trader"],"include_stablecoins":false,"token_age_days":{"max":30},"value_usd":{"max":100000,"min":1000}}}'

# 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.nansen.ai/api/v1/smart-money/historical-holdings' \
  -H 'content-type: application/json' \
  --data-raw '{"chains":["ethereum"],"date_range":{"from":"2025-10-01","to":"2025-10-31"},"filters":{"balance_24h_percent_change":{"max":0.1,"min":-0.1},"exclude_smart_money_labels":["30D Smart Trader"],"include_native_tokens":false,"include_smart_money_labels":["Fund","Smart Trader"],"include_stablecoins":false,"token_age_days":{"max":30},"value_usd":{"max":100000,"min":1000}}}' \
  | 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 $0.01 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%2Fapi.nansen.ai%2Fapi%2Fv1%2Fsmart-money%2Fhistorical-holdings&method=POST
const res = await pay("https://api.nansen.ai/api/v1/smart-money/historical-holdings", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "chains": [
      "ethereum"
    ],
    "date_range": {
      "from": "2025-10-01",
      "to": "2025-10-31"
    },
    "filters": {
      "balance_24h_percent_change": {
        "max": 0.1,
        "min": -0.1
      },
      "exclude_smart_money_labels": [
        "30D Smart Trader"
      ],
      "include_native_tokens": false,
      "include_smart_money_labels": [
        "Fund",
        "Smart Trader"
      ],
      "include_stablecoins": false,
      "token_age_days": {
        "max": 30
      },
      "value_usd": {
        "max": 100000,
        "min": 1000
      }
    }
  }),
});
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 $0.01 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://api.nansen.ai/api/v1/smart-money/historical-holdings",
        json={
            "chains": [
                "ethereum",
            ],
            "date_range": {
                "from": "2025-10-01",
                "to": "2025-10-31",
            },
            "filters": {
                "balance_24h_percent_change": {
                    "max": 0.1,
                    "min": -0.1,
                },
                "exclude_smart_money_labels": [
                    "30D Smart Trader",
                ],
                "include_native_tokens": False,
                "include_smart_money_labels": [
                    "Fund",
                    "Smart Trader",
                ],
                "include_stablecoins": False,
                "token_age_days": {
                    "max": 30,
                },
                "value_usd": {
                    "max": 100000,
                    "min": 1000,
                },
            },
        },
    )
    print(res.status_code, res.text)