Cadena Historico Pago

{
  "cadena": "Ethereum",
  "cambio_1a_pct": -40.24,
  "cambio_30d_pct": 8.32,
  "desde_maximo_pct": -50.84,
  "fecha_maximo": "2021-11-09",
  "maximo_historico_usd": 107458598469,
  "nota": "TVL histórico de la cadena. La distancia al máximo indica en qué punto del ciclo está. Fuente: DefiLlama.",
  "serie": [
    {
      "fecha": "2025-10-01",
      "tvl_usd": 87979353983
    },
    {
      "fecha": "2025-10-31",
      "tvl_usd": 84255331431
    },
    {
      "fecha": "2025-11-30",
      "tvl_usd": 68281250873
    },
    {
      "fecha": "2025-12-30",
      "tvl_usd": 67691816494
    },
    {
      "fecha": "2026-01-29",
      "tvl_usd": 71205336803
    },
    {
      "fecha": "2026-02-28",
      "tvl_usd": 52641185798
    },
    {
      "fecha": "2026-03-30",
      "tvl_usd": 52537857961
    },
    {
      "fecha": "2026-04-29",
      "tvl_usd": 44908393612
    },
    {
      "fecha": "2026-05-29",
      "tvl_usd": 42638382399
    },
    {
      "fecha": "2026-06-28",
      "tvl_usd": 37572359707
    },
    {
      "fecha": "2026-07-28",
      "tvl_usd": 41302987685
    },
    {
      "fecha": "2026-08-27",
      "tvl_usd": 49935445405
    },
    {
      "fecha": "2026-09-26",
      "tvl_usd": 53549828460
    }
  ],
  "tvl_actual_usd": 52830721315
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.vextorium.com/cadena-historico-pago' \
  -H 'content-type: application/json' \
  --data-raw '{"cadena":"Ethereum","dias":365}'

# 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/cadena-historico-pago' \
  -H 'content-type: application/json' \
  --data-raw '{"cadena":"Ethereum","dias":365}' \
  | 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 $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
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 $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.vextorium.com%2Fcadena-historico-pago&method=POST
const res = await pay("https://api.vextorium.com/cadena-historico-pago", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "cadena": "Ethereum",
    "dias": 365
  }),
});
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 $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
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/cadena-historico-pago",
        json={
            "cadena": "Ethereum",
            "dias": 365,
        },
    )
    print(res.status_code, res.text)