Functions Cortex402 Mortgage Rates

{
  "fetched_at": "2026-05-15T18:00:00Z",
  "rates": {
    "cpi_yoy_pct": {
      "as_of": "2026-04-30",
      "computed": "year-over-year",
      "series": "CPIAUCSL",
      "value": 2.4
    },
    "fed_funds_pct": {
      "as_of": "2026-04-30",
      "series": "FEDFUNDS",
      "value": 4.33
    },
    "mortgage_15yr_pct": {
      "as_of": "2026-05-08",
      "series": "MORTGAGE15US",
      "value": 6.05
    },
    "mortgage_30yr_pct": {
      "as_of": "2026-05-08",
      "series": "MORTGAGE30US",
      "value": 6.85
    },
    "prime_pct": {
      "as_of": "2026-05-14",
      "series": "DPRIME",
      "value": 7.5
    }
  },
  "receipt_tx": "0x9f4a2c8e6b1d3a5f7e0c2b1d4a6f8e2c0b1d3a5f7e0c2b1d4a6f8e2c0b1d3a5f",
  "request_id": "mr_4d8e2a5b7c1f3a6c0e2b4d6f",
  "source": "CorteX402",
  "ttl_seconds": 86400
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://jtifhcvbgxqwlywugvjv.supabase.co/functions/v1/cortex402-mortgage-rates' \
  -H 'content-type: application/json' \
  --data-raw '{}'

# 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://jtifhcvbgxqwlywugvjv.supabase.co/functions/v1/cortex402-mortgage-rates' \
  -H 'content-type: application/json' \
  --data-raw '{}' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fjtifhcvbgxqwlywugvjv.supabase.co%2Ffunctions%2Fv1%2Fcortex402-mortgage-rates&method=POST
const res = await pay("https://jtifhcvbgxqwlywugvjv.supabase.co/functions/v1/cortex402-mortgage-rates", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({}),
});
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://jtifhcvbgxqwlywugvjv.supabase.co/functions/v1/cortex402-mortgage-rates",
        json={},
    )
    print(res.status_code, res.text)