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The Micropayment Protocol (MPP) is a hosted alternative to x402. Tempo manages the wallet, settlement, and key custody so your agent never touches crypto directly.

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When to use MPP instead of x402

Pick MPP if any of these apply:
  • Your agent runs in an environment where you can’t safely manage signing keys (e.g. browser extensions, server-side LLM calls without a wallet provider).
  • You want a single funded balance shared across many agents in your org, with usage analytics in one dashboard.
  • You’re already using Tempo for other agentic API integrations.

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How it works

The session token is bound to your Tempo account. Each request debits the per-call price from your balance.

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Using mppx

Install the Tempo client: 
npm install mppx

import { MppClient } from "mppx";

const mpp = new MppClient({ apiKey: process.env.TEMPO_API_KEY });

const session = await mpp.openSession({
  recipient: "<recipient-from-discovery>",
  maxSpend: "1.00",
});

const res = await fetch(
  "https://api.syntalic.com/v1/shopper/best-price?q=airpods+pro&country=us",
  { headers: { "X-MPP-Session": session.token } }
);

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Pricing

MPP pricing matches x402 exactly — $0.01 for shopper/marketing endpoints, $0.02 for analyst endpoints. Tempo does not charge a markup on per-request fees, but they do require a minimum prepaid balance to open a session.

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Funding

Top up your Tempo balance via the Tempo dashboard using a credit card, ACH, or USDC deposit. Balance applies across all MPP-enabled APIs, not just Syntalic.