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API-First SaaS

API-First SaaS Development

We build SaaS platforms where the API is the product. From versioned REST and GraphQL endpoints with interactive documentation to developer portals, API key management, usage metering, and per-call billing — your platform ships with the developer experience that turns API consumers into paying customers and evangelists.

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INR 2000

Per Hour

30+

SaaS Products Built

4.9/5

Client Rating

<4 Weeks

MVP Delivery

Trusted by businesses worldwide

ShopifyAmazonStripeSlackNotionVercel

API-First Platform Features We Build

Everything developers need to integrate, build on, and pay for your API product

REST & GraphQL APIs

Well-designed, versioned APIs following OpenAPI 3.1 specification for REST and schema-first design for GraphQL. Consistent error handling, pagination, filtering, field selection, and batch operations. Every endpoint is documented, tested, and designed for backward compatibility across versions.

Developer Portal

A Stripe-quality developer portal with interactive API documentation, getting-started guides, code samples in multiple languages, API explorer for live testing, changelog, and status page. Developers can sign up, generate API keys, view usage, and manage their subscription without contacting your team.

API Metering & Billing

Real-time usage metering that tracks API calls, compute units, data transfer, or custom metrics per customer. Tiered pricing with overage billing, prepaid credit packs, and pay-as-you-go models. Usage dashboards with alerts, invoice generation, and integration with Stripe for automated billing.

SDK Generation

Auto-generated SDKs for Python, JavaScript, Go, Java, Ruby, and PHP from your OpenAPI spec. Each SDK includes type-safe method signatures, retry logic, error handling, and pagination helpers. Published to npm, PyPI, and Maven with semantic versioning and auto-generated documentation.

Webhooks & Events

Event-driven architecture with configurable webhook subscriptions per customer. Developers register endpoints, select event types, and receive signed payloads with retry logic and delivery logs. Event replay for debugging, webhook testing tools, and dead letter queues for failed deliveries.

Rate Limiting & Throttling

Intelligent rate limiting with per-key, per-endpoint, and per-plan quotas. Sliding window algorithms prevent burst abuse while allowing legitimate traffic spikes. Rate limit headers in every response tell developers their current usage and remaining quota. Automatic throttling with clear error messages.

<50ms

API Response Time

99.99%

API Uptime

6+

SDK Languages

Real-Time

Usage Metering

Our API-First SaaS Development Process

Design, build, and ship API products that developers love integrating with

API Design & Schema Planning
We design your API schema using OpenAPI 3.1 or GraphQL SDL before writing any implementation code. Resource modeling, endpoint naming, error taxonomy, pagination strategy, versioning approach, and authentication flow are all finalized in a design-first review with your team.
Core API & Infrastructure
Build the API server with proper middleware for authentication, rate limiting, tenant resolution, request validation, and response serialization. Set up the metering pipeline for real-time usage tracking, and implement the webhook event system with reliable delivery guarantees.
Developer Portal & Documentation
Build the self-service developer portal with interactive API docs generated from your OpenAPI spec, getting-started guides, code samples, API explorer, and key management. Developers can sign up, explore your API, and make their first successful call within 5 minutes.
SDKs, Billing & Integrations
Generate and publish SDKs for your target languages. Integrate usage metering with Stripe for automated billing, build the pricing page with plan comparison, and implement the upgrade/downgrade flow. Connect with your CRM and analytics tools for developer lifecycle tracking.
Load Testing & Developer Beta
Load test every endpoint at 10x expected traffic, validate rate limiting behavior, and stress-test the metering pipeline. Launch a developer beta program with selected partners, gather feedback on DX, and iterate. Production deployment with monitoring, alerting, and 30-day post-launch support.

API-First SaaS Pricing

Flexible engagement models for API platforms at any stage

Starter SaaS
INR 50,000starting
Core API with authentication, documentation, and basic rate limiting
  • RESTful API with OpenAPI docs
  • API key authentication
  • Basic rate limiting
  • Interactive API documentation
  • Basic usage tracking
  • Source code handover
  • 14-day post-launch support
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Most Popular
Professional SaaS
INR 2,00,000starting
Full developer platform with portal, SDKs, metering, and billing
  • REST + GraphQL API support
  • Self-service developer portal
  • SDK generation (3 languages)
  • Real-time usage metering & billing
  • Webhook system with retry logic
  • Advanced rate limiting per plan
  • API analytics dashboard
  • 30-day post-launch support
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Enterprise
Custompricing
Enterprise API platform with 6+ SDKs, SLA, and custom infrastructure
  • All Professional features
  • SDK generation (6+ languages)
  • API versioning with migration tools
  • Custom SLA-backed uptime
  • Dedicated API gateway infrastructure
  • Advanced security (OAuth 2.0, mTLS)
  • Dedicated project manager
  • Priority support with SLA
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What Our Clients Say

"Edesy built our payment processing API from the ground up — REST endpoints, Python and JavaScript SDKs, developer portal, and usage-based billing. Developers tell us our documentation is on par with Stripe. We went from zero to 500 API integrations within six months of launch."

F&

Founder & CEO

Founder at Payment Processing API Startup

"The metering and billing system Edesy built tracks every API call in real-time and bills customers accurately down to the individual request. Our usage-based pricing model is generating 40% more revenue than the flat-rate plans we had before because customers pay for what they actually use."

VO

VP of Product

Product at Data Enrichment API Platform

"The webhook system handles over 2 million events per day with 99.97% delivery success rate. The retry logic and dead letter queues mean no event is ever truly lost. Our customers rely on these webhooks for mission-critical workflows, and the reliability has been exceptional."

C

CTO

Technology at E-commerce Integration Platform

API-First SaaS — Frequently Asked Questions

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Resources to help you evaluate and implement

B2B SaaS DevelopmentB2C SaaS DevelopmentMarketplace SaaSMulti-Tenant SaaSWhite-Label SaaS

Ready to Build Your API-First SaaS Platform?

Get a free consultation and detailed estimate for your API product. Our team will help you design the right API schema, developer experience, and billing model to build a platform that developers love integrating with.

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  • View All Products

Solutions

  • For E-commerce
  • For Healthcare
  • For Real Estate
  • For Restaurants
  • For Appointments
  • View All Use Cases

Services

  • AI Chatbot Development
  • Voice AI Development
  • Shopify Development
  • SaaS Development
  • WhatsApp API Integration
  • View All Services

Resources

  • Documentation
  • Voice Agent Docs
  • API Reference
  • Number Masking API Docs
  • Blog
  • Changelog
  • Book a Demo

Company

  • About Us
  • Contact
  • Careers
  • Privacy Policy
  • Terms of Service
  • AI Voice Assistant
  • WhatsApp Voice AI
  • WhatsApp Bot Builder
  • AI Website Chatbot
  • AI-SDR
  • Number Masking
  • Shopify Apps
  • View All Products
  • For E-commerce
  • For Healthcare
  • For Real Estate
  • For Restaurants
  • For Appointments
  • View All Use Cases
  • AI Chatbot Development
  • Voice AI Development
  • Shopify Development
  • SaaS Development
  • WhatsApp API Integration
  • View All Services
  • Documentation
  • Voice Agent Docs
  • API Reference
  • Number Masking API Docs
  • Blog
  • Changelog
  • Book a Demo
  • About Us
  • Contact
  • Careers
  • Privacy Policy
  • Terms of Service

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