Btc Etf

{
  "briefing_metadata": {
    "correlations_count": 1,
    "description": "Spot BTC ETF flow read: net daily flows, aggregate AUM (sourced from per-issuer pages), and per-issuer breakdown across iShares Bitcoin Trust (IBIT), Fidelity Wise Origin Bitcoin Fund (FBTC), Grayscale Bitcoin Trust (GBTC), and other approved spot ETFs",
    "metrics_count": 8,
    "name": "BTC ETF Flows"
  },
  "briefing_used": "btc.etf-flows",
  "metrics": {
    "bitcoin-price": {
      "name": "bitcoin-price"
    },
    "btc-etf-aum": {
      "name": "btc-etf-aum"
    },
    "btc-etf-cumulative-flow": {
      "name": "btc-etf-cumulative-flow"
    },
    "btc-etf-fbtc-flow": {
      "name": "btc-etf-fbtc-flow"
    },
    "btc-etf-gbtc-flow": {
      "name": "btc-etf-gbtc-flow"
    },
    "btc-etf-ibit-flow": {
      "name": "btc-etf-ibit-flow"
    },
    "btc-etf-net-flow": {
      "name": "btc-etf-net-flow"
    },
    "etf-ibit-intraday-quote": {
      "name": "etf-ibit-intraday-quote"
    }
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.prereason.com/api/btc/etf?format=json'

# 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://api.prereason.com/api/btc/etf?format=json' \
  | 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 $0.03 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.03" });
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 $0.03 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.prereason.com%2Fapi%2Fbtc%2Fetf
const res = await pay("https://api.prereason.com/api/btc/etf?format=json");
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 $0.03 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.03"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.prereason.com/api/btc/etf?format=json")
    print(res.status_code, res.text)