Cost of Custom API Development in 2026
What it costs in 2026 to build a standalone API or backend service for third-party integration — from a simple 10-endpoint service to a full API gateway layer.
This is for a standalone API built to be consumed by other systems, not a full product. Cost is driven by endpoint count, the auth model (API keys versus OAuth2), how many upstream systems it has to aggregate or normalize data from, and whether you need versioning and SLA-grade reliability from day one.
Cost breakdown
- Simple (₹2–4 lakh): 10–15 REST endpoints, API key auth, single data source, Swagger/OpenAPI docs.
- Mid-complexity (₹6–12 lakh): 30+ endpoints, OAuth2, rate limiting, webhook support, integration with 2–3 external systems.
- Complex (₹15–30 lakh+): API gateway layer, aggregation across many upstream services, versioned endpoints (v1/v2), SLA-grade uptime, extensive automated contract testing.
Documentation is not optional here — an undocumented API just moves the integration cost onto whoever consumes it, and that bill usually comes back to you as support tickets. Timeline: 3–8 weeks depending on tier.
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