Pay Per Request (MPP)

import { Mppx, tempo } from "mppx/client";
import { createClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { tempo as tempoChain } from "viem/chains";

const account = privateKeyToAccount(process.env.TEMPO_PRIVATE_KEY as `0x${string}`);
const mppx = Mppx.create({
  methods: [
    tempo.charge({
      account,
      mode: "push", // Pulse is push-only; local accounts default to pull
      getClient: () =>
        createClient({ chain: tempoChain, transport: http("https://rpc.tempo.xyz") }),
      expectedChainId: 4217,
    }),
  ],
  polyfill: false, // don't patch global fetch; use mppx.fetch explicitly
});

// mppx handles the 402 → pay → retry loop for you
const response = await mppx.fetch("https://api.runpulse.com/extract", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    file_url: "https://www.impact-bank.com/user/file/dummy_statement.pdf",
  }),
});
const result = await response.json();
console.log(result.markdown, result.mpp_session.api_key);

import base64, json, re, requests

url = "https://api.runpulse.com/extract"
body = {"file_url": "https://www.impact-bank.com/user/file/dummy_statement.pdf"}

def b64url_decode(value):
    return base64.urlsafe_b64decode(value + "=" * (-len(value) % 4))

# 1. Get the challenge
r = requests.post(url, json=body)
header = r.headers["WWW-Authenticate"]
fields = dict(re.findall(r'(\w+)="([^"]*)"', header))
request = json.loads(b64url_decode(fields["request"]))

# 2. Pay request["amount"] of request["currency"] to request["recipient"]
#    on Tempo with your wallet library, and capture the tx hash
tx_hash = pay_on_tempo(request)  # your signer here

# 3. Build the credential and retry the identical request
credential = {
    "challenge": {k: fields[k] for k in
        ("id", "realm", "method", "intent", "expires", "request", "opaque")},
    "payload": {"type": "hash", "hash": tx_hash},
}
token = base64.urlsafe_b64encode(
    json.dumps(credential, separators=(",", ":")).encode()
).decode().rstrip("=")

r = requests.post(url, json=body, headers={"Authorization": f"Payment {token}"})
print(r.json()["markdown"])