Should we build a REST API or GraphQL API?

REST is the right choice for most SaaS products -- it is widely understood, easy to cache, and works well with standard HTTP tooling. GraphQL is better when your API consumers need flexible queries across complex data relationships, or when you have mobile clients that need to minimize network requests. Many SaaS products offer REST as the primary API and add GraphQL as a secondary option for power users.

How do you implement API rate limiting?

We implement sliding window rate limiting using Redis for high-performance counter storage. Rate limits are tiered by subscription plan -- free tier might get 100 requests per minute, while enterprise gets 10,000. Each response includes X-RateLimit headers so consumers can track their usage. We also implement per-endpoint limits for expensive operations and burst allowances for legitimate traffic spikes.

How does the webhook system ensure reliable delivery?

Each webhook event is persisted to a durable queue before delivery attempts begin. Failed deliveries are retried with exponential backoff (typically 1 minute, 5 minutes, 30 minutes, 2 hours, 24 hours). Each payload includes an HMAC signature so consumers can verify authenticity, and an idempotency key so duplicate deliveries can be safely ignored. A webhook delivery log shows the status, response code, and response body for every attempt.

What API versioning strategy do you recommend?

For most SaaS APIs, we recommend URL path versioning (api.example.com/v1/resources) because it is explicit, easy to understand, and simple to route. We design APIs to be backward-compatible by default -- adding new fields and endpoints without bumping the version. Major versions are reserved for breaking changes with sunset headers and migration guides. We typically support two major versions simultaneously during transitions.

Can you generate SDKs for our API?

Yes. We generate typed SDKs from your OpenAPI specification in multiple languages -- Python, JavaScript/TypeScript, Go, Ruby, and Java. SDKs include authentication handling, automatic retries, pagination helpers, and webhook signature verification utilities. SDKs are published to package managers (npm, PyPI, etc.) and maintained through your CI/CD pipeline so they stay in sync with API changes.

How do you handle API authentication and authorization?

We implement OAuth2 for user-context API access with authorization code flow, API keys for server-to-server integrations, and JWT tokens for session-based access. API keys are scoped with granular permissions so consumers can create read-only keys, write-only keys, or keys limited to specific resources. All authentication events are logged for security auditing.

How do you ensure backward compatibility when evolving the API?

We follow strict backward compatibility rules -- never remove or rename existing fields, never change field types, and never alter the meaning of existing error codes. New functionality is added as optional fields or new endpoints. Deprecation follows a defined lifecycle: mark as deprecated in documentation, add sunset headers with a date, send direct notifications to affected consumers, and remove only after the sunset date.

How long does it take to build a production-grade SaaS API?

A basic REST API with authentication, documentation, and rate limiting takes 3-4 weeks. A full API platform with webhooks, developer sandbox, interactive docs, and versioning takes 8-12 weeks. Enterprise API platforms with SDK generation, marketplace infrastructure, and usage-based billing take 12-16 weeks. We deliver a working API with documentation in under 4 weeks for most projects.

API Development

SaaS API Development Services

Your SaaS product's API is its most critical interface -- it powers integrations, enables third-party developers, and often generates more usage than the UI. We design and build RESTful and GraphQL APIs with OpenAPI specification, intelligent rate limiting, real-time webhooks, developer sandboxes, and versioning strategies that let you evolve your API without breaking existing consumers.

Schedule a Call

INR 2000

Per Hour

30+

SaaS Products Built

4.9/5

Client Rating

<4 Weeks

MVP Delivery

API Development Capabilities We Build

Production-grade APIs that power integrations, enable developers, and scale with your SaaS platform

OpenAPI Specification Design

API-first design starting with a comprehensive OpenAPI 3.1 specification that defines every endpoint, request/response schema, authentication method, and error code. The spec serves as a single source of truth for code generation, documentation, SDK creation, and contract testing between frontend and backend teams.

Rate Limiting & Throttling

Multi-tiered rate limiting based on API keys, subscription plans, and endpoint sensitivity. Sliding window counters using Redis for precise, high-performance throttling. Custom rate limit headers (X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset) so consumers can implement adaptive backoff. Burst allowances for legitimate traffic spikes.

Webhook Event System

Event-driven webhook system that notifies external systems when important events occur in your SaaS product. HMAC signature verification for payload authenticity, automatic retries with exponential backoff for failed deliveries, webhook delivery logs, and a self-service portal where developers configure endpoints and subscribe to specific event types.

Developer Sandbox

Isolated sandbox environments where developers can test API integrations without affecting production data. Pre-seeded test data, deterministic responses for predictable testing, and sandbox-specific API keys. Interactive API explorer (like Swagger UI or Stoplight) with try-it-out functionality directly in the documentation.

API Versioning Strategy

Future-proof versioning using URL path versioning (v1, v2), header-based versioning, or content negotiation -- chosen based on your developer ecosystem. Deprecation policies with sunset headers, migration guides, and backward-compatible changes that do not require version bumps. Parallel version support during transition periods.

Auto-Generated Documentation

Beautiful, interactive API documentation generated directly from your OpenAPI spec. Code samples in multiple languages (cURL, Python, JavaScript, Go, Ruby), authentication guides, pagination patterns, error handling reference, and changelog. Documentation stays in sync with your codebase automatically through CI/CD pipeline integration.

Our API Development Process

A proven 5-step process to build APIs that developers love integrating with

API Design & Specification

We start with API-first design -- defining the complete OpenAPI 3.1 specification before writing implementation code. We map out resource models, endpoint patterns, authentication flows, pagination strategies, error schemas, and rate limiting tiers. The spec is reviewed and approved before development begins.

Implementation & Testing

Build the API layer with proper input validation, authentication middleware, business logic handlers, and database queries. Every endpoint gets unit tests, integration tests, and contract tests verified against the OpenAPI spec. We implement comprehensive error handling with meaningful error codes and messages.

Webhook & Event System

Design the event taxonomy, build the webhook delivery infrastructure with retry logic and delivery tracking, and create the self-service webhook management portal. Each webhook payload includes HMAC signatures and idempotency keys so consumers can process events safely.

Documentation & Sandbox

Generate interactive API documentation from the OpenAPI spec, create code samples in multiple languages, build the developer sandbox with test data, and set up the API explorer. We write guides for common integration patterns and authentication flows.

Launch & Developer Onboarding

Production deployment with API monitoring, latency tracking, and error rate alerting. 30-day post-launch support including assistance onboarding your first API consumers, troubleshooting integration issues, and optimizing rate limits based on actual usage patterns.

API Development Pricing

Flexible engagement models for SaaS API development

Starter SaaS

INR 50,000starting

Basic REST API with documentation for early-stage SaaS

REST API with OpenAPI spec
API key authentication
Basic rate limiting
Auto-generated documentation
JSON error responses
Source code handover
14-day post-launch support

Get Started

What Our Clients Say

"Edesy designed our public API from scratch using API-first methodology. The OpenAPI spec they created was so thorough that our frontend team and three integration partners could work in parallel without a single breaking mismatch. Our API now handles 2 million requests per day with p95 latency under 80ms."

CTO

Technology at Data Platform SaaS (Series B)

"The webhook system Edesy built is rock solid. We have 400+ webhook endpoints registered by our customers, processing 50,000+ events daily with a 99.97% delivery success rate. The retry logic and delivery logs give our customers complete visibility into event processing."

VP Engineering

Engineering at E-Commerce Integration Platform

"Our developer adoption rate tripled after Edesy rebuilt our API documentation and added the interactive sandbox. Developers go from signup to first successful API call in under 5 minutes. The code samples in Python, JavaScript, and cURL saved us hundreds of support tickets."

Head of Developer Relations

Developer Relations at Communication API Startup

API Development

SaaS API Development Services

Schedule a Call

INR 2000

Per Hour

30+

SaaS Products Built

4.9/5

Client Rating

<4 Weeks

MVP Delivery

Trusted by businesses worldwide

ShopifyAmazonStripeSlackNotionVercel

API Development Capabilities We Build

Production-grade APIs that power integrations, enable developers, and scale with your SaaS platform

OpenAPI Specification Design

Rate Limiting & Throttling

Webhook Event System

Developer Sandbox

API Versioning Strategy

Auto-Generated Documentation

<100ms

p95 API Latency

99.99%

API Uptime

100%

OpenAPI Coverage

SDK Languages

Our API Development Process

A proven 5-step process to build APIs that developers love integrating with

API Design & Specification

Implementation & Testing

Webhook & Event System

Documentation & Sandbox

Launch & Developer Onboarding

API Development Pricing

Flexible engagement models for SaaS API development

Starter SaaS

INR 50,000starting

Basic REST API with documentation for early-stage SaaS

REST API with OpenAPI spec
API key authentication
Basic rate limiting
Auto-generated documentation
JSON error responses
Source code handover
14-day post-launch support

Get Started

What Our Clients Say

CTO

Technology at Data Platform SaaS (Series B)

VP Engineering

Engineering at E-Commerce Integration Platform

Head of Developer Relations

Developer Relations at Communication API Startup

Frequently Asked Questions

Explore More

Resources to help you evaluate and implement

Subscription & Billing Multi-Tenancy Architecture Authentication & SSO Admin Dashboard & Analytics RBAC & Permissions

Ready to Build a World-Class SaaS API?

Get a free consultation on API design and architecture for your SaaS product. Our API experts will help you define the right specification, versioning strategy, and developer experience to make your API a competitive advantage.

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