How much does API development cost in the United States?

API development in the United States starts at $375 for basic REST endpoints and scales up to $3,500+ for enterprise microservice architectures.

API Development Cost in United Kingdom 2026

Endpoint Volume

5 Endpoints Simple API backend 8 Endpoints Standard service API 15 Endpoints Multi-resource API 30 Endpoints Enterprise microservices

Provider Tier

Freelancer £28–£44 / hr Boutique Agency £40–£64 / hr Enterprise Agency £52–£80 / hr

API Add-ons

JWT / OAuth2 Key Auth (+3 hrs)

Swagger / OpenAPI Docs (+2 hrs)

Real-time Webhook Events (+3 hrs)