Stablecoin Mints Burns

{
  "detail": [
    {
      "burn": {
        "largest": 90000000,
        "total": 771572701,
        "trades": 1480
      },
      "covered_hours": 12,
      "issuance": {
        "largest": 90000000,
        "total": 804312775,
        "trades": 2568
      },
      "net": 32740074,
      "network": "ethereum",
      "reviewed_blocks": 3600,
      "stablecoin": "USDC"
    },
    {
      "burn": {
        "largest": 0,
        "total": 0,
        "trades": 0
      },
      "covered_hours": 12,
      "issuance": {
        "largest": 0,
        "total": 0,
        "trades": 0
      },
      "net": 0,
      "network": "ethereum",
      "reviewed_blocks": 3600,
      "stablecoin": "USDT"
    }
  ],
  "hours": 12,
  "note": "If the public node does not keep that much history, it is shown in covered_hours.",
  "reading": "net inflow of dollars into the ecosystem",
  "source": "Events from the USDC (Circle) and USDT (Tether) contracts on public nodes",
  "total_net_usd": 32535744
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.vextorium.com/v1/stablecoin-mints-burns' \
  -H 'content-type: application/json' \
  --data-raw '{"hours":12}'

# 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/stablecoin-mints-burns' \
  -H 'content-type: application/json' \
  --data-raw '{"hours":12}' \
  | 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%2Fstablecoin-mints-burns&method=POST
const res = await pay("https://api.vextorium.com/v1/stablecoin-mints-burns", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "hours": 12
  }),
});
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/stablecoin-mints-burns",
        json={
            "hours": 12,
        },
    )
    print(res.status_code, res.text)