Public APIs & Webhooks
Turn SQL queries into REST APIs in seconds. Event-driven webhooks with dead letter queue, OpenAPI docs, and enterprise security—no backend code required.
Create REST APIs from SQL queries—OpenAPI docs auto-generated
Everything you need to expose data
APIs and webhooks with enterprise security, reliability, and developer experience.
APIs from SQL Queries
Save a query, get an API endpoint. OpenAPI spec auto-generated—no manual docs, no backend code.
API Key Management
Project-level or endpoint-specific keys. Rotate, revoke, and track usage—simple, secure access control.
Event-Driven Webhooks
Push data changes instantly via CDC, Kafka, or triggers. Real-time updates without expensive polling.
Dead Letter Queue (DLQ)
Capture failed webhook deliveries. Never lose events—replay failed calls with one click.
Policy-Controlled Endpoints
ACL policies, quotas, and rate limits enforce governance. Security included, not bolted on.
OpenAPI Playground
Interactive Swagger UI for every project. Test endpoints, see schemas, authorize with API keys—all built-in.
Why teams choose Fastero for APIs
Skip the backend code. Push data changes in real-time. Never lose events.
No Backend Code Required
Save a SQL query in Workbench, click "Create API", and your endpoint is live. No Express.js, no Flask, no deployment pipeline—Fastero handles routing, auth, and docs automatically.
Push, Not Poll
Webhooks fire instantly when data changes (CDC, Kafka, triggers). No more expensive polling every 60 seconds—your systems get updates in real-time.
Webhooks That Do Not Lose Data
Failed deliveries land in the Dead Letter Queue. Replay them manually or in bulk—never lose critical events because a destination was temporarily down.
Developer-Friendly Docs
OpenAPI spec auto-generated from your queries. Swagger UI included—developers can test endpoints, see request/response schemas, and authorize with API keys without leaving the page.
Event-Driven Webhook Flow
Data Changes
New row inserted in orders_table (CDC, trigger, or Kafka event)
Webhook Fires
Fastero POSTs payload to https://acme.com/webhooks/orders
Success or DLQ
✅ 200 OK → logged. ❌ Timeout/error → sent to Dead Letter Queue for replay.
How it works
From SQL query to live API in seconds. Webhooks that do not lose data.
Instant API Creation
Select a saved query, configure parameters and rate limits, click "Create". Your API endpoint is live in seconds with auto-generated OpenAPI docs.
Secure by Default
API keys enforce authentication. ACL policies control who can access which endpoints. Rate limits prevent abuse. Quotas manage costs—all included.
DLQ + Replay
Failed webhook deliveries are captured in the Dead Letter Queue. Replay individual events or bulk-replay all failures—never lose data.
Real-world use cases
Backend Engineer
Expose Analytics to Mobile App
Save SQL query "user_engagement_stats", create API endpoint `/api/v1/engagement`. Mobile app calls it with user ID parameter—no Express.js backend needed.
Data Engineer
Real-Time Data Sync
CDC on `products_table` fires webhook to external CRM every time a product is updated. No polling, no batch jobs—CRM stays in sync instantly.
Product Manager
Event Notifications
Webhook fires to Slack when daily revenue exceeds $100k. Dead Letter Queue ensures the notification is never lost—replay if Slack is temporarily down.
Common questions
How do I create an API from a SQL query?
Save a query in Workbench, open its detail page, and click "Create API Endpoint". Configure parameters (optional), set rate limits, and click "Create". Your endpoint is live with auto-generated OpenAPI docs.
What happens if a webhook fails?
Failed deliveries (timeouts, 500 errors, connection failures) are sent to the Dead Letter Queue (DLQ). You can replay them manually or in bulk from the UI—data is never lost.
How are API keys managed?
Create project-level or endpoint-specific API keys. Keys can be rotated or revoked instantly. All API key usage is tracked in delivery logs.
Can I track API usage?
Yes—webhook delivery history shows success/failure per event with timestamps, latency, and error details. Track which endpoints are called and monitor delivery reliability.
What retry logic do webhooks use?
Webhooks automatically retry failed deliveries with exponential backoff. If all retries fail, events land in the Dead Letter Queue where you can replay them manually.
How do OpenAPI docs work?
OpenAPI specifications are auto-generated from your saved queries. Each project gets a Swagger UI for interactive testing—no manual documentation required.
Ready to expose your data?
Create REST APIs from SQL queries in seconds. Event-driven webhooks with DLQ. OpenAPI docs auto-generated. Start free—no credit card required.