API Development & Integration

API development in 2026 means building application interfaces that connect systems, enable developer ecosystems, and serve AI agents — not just human-driven applications. The API management market hits $12.77B; 35M+ developers use Postman; and MCP (Model Context Protocol) is emerging as the standard for AI-agent-to-API connectivity. We build REST APIs, GraphQL endpoints, event-driven webhooks, and MCP servers — with OWASP security hardening and full observability built in from the design phase.

Timeline depends on scope and complexity. A single third-party integration (e.g., Stripe payments, Salesforce sync) with proper error handling, webhooks, and documentation typically takes 2–4 weeks. A full custom API layer with authentication, rate limiting, versioning, and developer portal takes 6–14 weeks. An enterprise integration connecting multiple legacy systems typically takes 8–20 weeks with phased delivery. We provide a detailed milestone plan after a discovery session.

REST is the right choice for public-facing APIs, webhook-based integrations, simple CRUD operations, and APIs consumed by external partners who expect a predictable interface. GraphQL is the right choice for data-intensive dashboards, mobile apps that need to minimize request payloads, and integrations where consumers need flexible querying across related data types. 67% of large enterprises use both in production — the decision isn't binary. We'll recommend the right architecture based on your actual consumer patterns, not a preference.

MCP (Model Context Protocol) is the emerging standard for exposing application capabilities to AI agents — created by Anthropic and now governed under the Linux Foundation. It defines how AI agents discover, authenticate, and invoke tools from external systems. If your product has AI agents interacting with it (or you're building AI agent capabilities), MCP compatibility means your API can be consumed by the growing ecosystem of AI agent frameworks and tools. 97M monthly SDK downloads by early 2026 signals this is infrastructure worth building for now, not later.

We address all 10 OWASP API Security risks as part of standard API development: BOLA (Broken Object Level Authorization) — object-level permission checks on every endpoint; Broken Authentication — OAuth 2.1 or API key with rotation; Excessive Data Exposure — field-level response filtering; Lack of Rate Limiting — per-consumer rate limits at the gateway; Security Misconfiguration — security headers, CORS policy, TLS configuration validation. We also conduct pre-launch penetration testing and provide a security sign-off report.

Good API documentation in 2026 means: an OpenAPI 3.1 specification that matches the actual implementation (not aspirational docs); an interactive explorer where developers can make live API calls against a sandbox environment; clear error codes with human-readable messages and remediation hints; authentication walkthrough with working code examples in target languages; changelog with explicit breaking vs. non-breaking change classification; and SDK generation for common languages. We build all of this as a standard output of every API engagement, not as a separate documentation project.

We implement versioning strategy from day one: URI versioning (v1, v2) for public APIs where consumer-side control matters; header-based versioning (Accept: application/vnd.api+json;version=2) for internal APIs where the overhead is acceptable; Semantic Versioning for SDK and client library releases. We define a deprecation policy at launch — typically 12–18 months' notice for breaking changes — and implement automated change detection in CI/CD that flags potentially breaking modifications before they reach production. APIs that break silently destroy integrations. We prevent that.

Yes. We build enterprise-grade webhook infrastructure with: exactly-once delivery semantics using idempotency keys; ordered delivery via per-subscription sequence numbers; retry logic with exponential backoff and dead letter queues for failed deliveries; consumer acknowledgement tracking; and delivery status dashboards for both internal monitoring and consumer-facing transparency. For high-throughput scenarios (millions of events/day), we build Kafka-backed event pipelines with webhook fan-out. Reliable webhooks eliminate the integration debugging burden that consumes engineering time on both sides of every webhook connection.

Cost depends on scope: a single third-party integration with proper error handling and documentation is a focused engagement; a full custom API platform with authentication, rate limiting, developer portal, and MCP support is a multi-month program. India-based API development at Code24x7 rates delivers the same engineering quality at 40–70% lower cost than equivalent US or UK teams. Share your integration requirements and we'll provide a transparent, component-level cost breakdown — not a range, a specific proposal.

A standard engagement includes: consumer discovery and API strategy, OpenAPI 3.1 contract-first specification, security threat modeling, implementation in 2-week sprints with testing against all OWASP API Top 10 risks, third-party integration with proper error handling and retry logic, interactive documentation and developer portal, API gateway configuration (rate limiting, auth, observability), load testing at expected production volumes, and post-launch monitoring setup. Source code, OpenAPI specs, security documentation, and architecture runbooks are all delivered. We scope precisely in a proposal after a discovery call.