API Development & ManagementAPIs your partners and apps can rely on.
Design, development and management of REST and GraphQL APIs, with gateways, authentication, rate limits, documentation, developer portals, versioning and monitoring.
- REST and GraphQL
- API gateway
- Developer portal
- Integration Assessment1–2 weeks · Fixed price
- API Programme Build3–10 weeks · Fixed price per phase
What are API development and management services?
API development creates the interfaces that let applications, partners and customers exchange data with your systems. API management adds a gateway for security, rate limits and analytics, versioning, documentation and a developer portal. Stack18 designs APIs with OpenAPI specifications, builds them securely, puts them behind a gateway and monitors performance and usage.
- REST API development
- API management India
- API gateway setup
- GraphQL development
- developer portal
Last reviewed 11 November 2026 by the Stack18 delivery team in Jaipur.Security & AI governancePricing
| What it covers | API design; Development; Security; API gateway; Developer portal; Versioning and monitoring. |
|---|---|
| Typical first step | Integration Assessment: 1–2 weeks; fixed price. |
| Main engagement | API Programme Build: 3–10 weeks; fixed price per phase. |
| Measured by | API uptime; Response time; Partner onboarding time; Security findings. Each against an agreed baseline. |
| Governance | Human approval at 5 governance gates before anything reaches production. NDA available on request. |
| Delivery team | Based in Jaipur, India. A senior specialist replies within one business day. |
You need this when…
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API Development & Management, end to end.
The features and building blocks of an API Development & Management engagement. Each is delivered by the same team on the Agentic SDLC, with your approval at every critical step.
API design
Clear contracts agreed before building.
- OpenAPI specs
- Resource modelling
- Consistent standards
Development
Fast, secure APIs on your stack.
- REST and GraphQL
- Webhooks
- Pagination and filters
Security
Authentication, authorisation and protection.
- OAuth 2.0 and API keys
- Rate limiting
- OWASP API Top 10
API gateway
One front door for all APIs.
- Gateway setup
- Usage analytics
- Throttling
Developer portal
Documentation and sandbox for integrators.
- Interactive docs
- Sandbox keys
- Onboarding guides
Versioning and monitoring
Change safely and see problems early.
- Versioning policy
- Latency monitoring
- Error alerts
A typical engagement, step by step.
Senior people lead every phase. Specialised AI agents on the Agentic SDLC handle the repetitive work, and nothing ships without your approval.
Discover
We map today’s process, systems and data for API design, development and security, talk to the people who run it and agree the baseline for API uptime and response time, so progress is measured from week one.
Design
We design the flows, roles, approvals and integrations for API design and development, and review a clickable prototype or technical design with the people who will use it before anything is built.
Build
We build in weekly demos, starting with API design, then development and security. Each release is tested on your own data and passes a human approval gate before the next begins.
Launch
We migrate data, train your team and support go-live. After 30 days we review API uptime and response time against the baseline and agree what to extend next.
How much does API Development & Management cost in India?
Most API Development & Management projects start with an Integration Assessment (1–2 weeks, fixed price), which fixes the scope, team and price before you commit. API Programme Build takes 3–10 weeks at a fixed price per phase. Prices exclude GST. Cloud hosting and third-party usage, such as messaging, payment or AI model charges, are paid at cost.
Integration Assessment
Teams with disconnected systems.
- Duration
- 1–2 weeks
- Pricing
- Fixed price
- System map
- Integration options
- Roadmap
API Programme Build
Companies opening data to apps and partners.
- Duration
- 3–10 weeks
- Pricing
- Fixed price per phase
- APIs and gateway
- Developer portal
- Monitoring
What drives the price
- Number of modules, workflows and user roles
- Integrations with your ERP, CRM, payments, GST or messaging tools
- Volume and quality of data to migrate
- Compliance, security and audit requirements
- Mobile apps, offline use or multiple languages
Always included
- Fixed scope and price before build starts
- Weekly working demos and human approval gates
- Training, documentation and 30 days of hypercare
- Your code, data and IP, owned by you
See Stack18 pricing or compare fixed price and time and materials.
What we have shipped, and what a typical engagement looks like.
Delivered projects link to the full case study. Illustrative scenarios describe typical engagements and are not named client results.
Logistics aggregator
- Challenge
- Large shippers wanted to book and track shipments through APIs.
- What we do
- Shipment APIs with OAuth, webhooks for status, a gateway with rate limits and a developer portal with sandbox.
- We would measure
- API uptime, response time, partner onboarding time, against a baseline agreed in week one.
8 weeks
NBFC
- Challenge
- Lending partners integrated through inconsistent custom endpoints.
- What we do
- Standardised partner APIs, versioning, security testing and monitoring.
- We would measure
- API uptime, response time, partner onboarding time, against a baseline agreed in week one.
7 weeks
Ethnic wear D2C, Jaipur
- Challenge
- A ₹100+ crore brand needed website, app and back office to share one catalogue and one record of stock and orders.
- What we do
- Nine specialists built website, mobile app and ERP on one connected foundation in two-week sprints.
3 months
Read the case study →We agree targets before we start.
Free API design review
Share your API docs or ideas. We review design and security.
- Design feedback
- Security risks
- Plan
API Development & Management questions.
Cost, timelines, integrations and ownership. If your question is not here, ask a senior specialist on a free 30-minute call.
Ask us anythingHow much does API Development & Management cost in India?
Most API Development & Management projects start with an Integration Assessment (1–2 weeks, fixed price), which fixes the scope, team and price before you commit. API Programme Build takes 3–10 weeks at a fixed price per phase. Prices exclude GST. Cloud hosting and third-party usage, such as messaging, payment or AI model charges, are paid at cost.
REST or GraphQL?
REST suits most partner and public APIs; GraphQL suits apps that need flexible queries. Many teams use both.
Which API gateways do you use?
AWS API Gateway, Azure API Management, Google Apigee, Kong and others, depending on your cloud.
Can you secure existing APIs?
Yes. We review against the OWASP API Security Top 10 and add authentication, rate limits and monitoring.
Do you build webhooks?
Yes, with retries, signatures and delivery logs.
Do you provide API Development & Management across India?
Yes. Stack18 is headquartered in Jaipur, Rajasthan, and delivers API Development & Management for businesses across India, including Delhi NCR, Mumbai, Bengaluru, Pune, Hyderabad and Ahmedabad. Work runs remotely with weekly demos, and on-site workshops are arranged for key milestones.
Let's scope your API Development & Management project.
Tell us where you are and where you want to be. A senior specialist will reply within one business day with next steps.
- Free 30-minute consultation
- Indicative estimate after the call
- NDA available on request