Intermediate LevelREST APIs & Web Services
How do you design API Usage-Based Billing using meter events and Stripe?
❓ Interview Prompt: Explain API Monetization, Usage-Based Billing, tracking API calls in high-throughput time-series databases, and Stripe Metering APIs.
Monetizing public APIs based on request volume (e.g. $0.001 per API request):
Architecture:
1
API Gateway Telemetry: Gateway emits an asynchronous meter event payload ('{ tenantId, timestamp, bytesTransferred }') to Kafka/RabbitMQ.
2
Time-Series Aggregation: Aggregator worker accumulates request counts per tenant in Redis/ClickHouse.
3
Stripe Billing Sync: Worker reports aggregated meter totals to Stripe Metering API ('/v2/billing/meter_events') for automated monthly invoice billing.
Code Implementation Example
typescript
import Stripe from 'stripe';
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);
export async function recordApiMeterEvent(customerId: string, eventCount: number) {
await stripe.billing.meterEvents.create({
event_name: 'api_requests',
payload: {
value: eventCount.toString(),
stripe_customer_id: customerId,
},
});
}💡Reporting aggregated API usage metrics to Stripe Metering API.
🎯 Interview Key Takeaway
Design usage-based API billing by logging gateway telemetry to time-series queues and reporting meter events to billing APIs like Stripe.
#Monetization#Usage Billing#Stripe#Intermediate
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