MonetizeKit vs Stripe Billing

import Stripe from "stripe";

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);

// Which features does this customer hold right now?
const { data: entitlements } = await stripe.entitlements.activeEntitlements.list({
  customer: "cus_123",
});
const canUse = entitlements.some((e) => e.lookup_key === "api_access");

// Report usage to a billing meter; it is rated when the invoice is generated
await stripe.billing.meterEvents.create({
  event_name: "api_calls",
  payload: { stripe_customer_id: "cus_123", value: "1" },
});

import { MonetizeKit } from "@monetizekit/node";

const mk = new MonetizeKit({ apiKey: process.env.MONETIZEKIT_SECRET_KEY! });

// Gate a feature with an explainable decision
const decision = await mk.entitlements.check("cust_123", "api_access");
if (!decision.allowed) {
  // decision.reasonCode: "not_in_plan" | "limit_reached" | ...
  // decision.grantedByPlans: plans that would grant access
  // decision.resetsAt: when a reached limit's window resets
}

// Hold credits for work with unknown cost, capture the actual cost
const { value } = await mk.credits.withReservation(
  { customerId: "cust_123", amount: 100, description: "agent run" },
  async () => {
    const output = await runAgent();
    return { value: output, cost: output.tokensUsed * 0.01 };
  },
);