API Development Company

What do REST API development services include?

A REST API is a contract as much as code: every client you have, and every partner you add later, depends on its URLs, fields and error codes staying predictable. So the work starts with resource design - naming orders, users and payments as nouns, choosing status codes, and fixing one error format - written down as an OpenAPI document before any endpoint is built.

A REST API delivered by Miracuves includes:

• Resource and endpoint design, agreed in an OpenAPI spec
• Versioning rules, so new fields never break existing clients
• Authentication with API keys, OAuth 2.0 or JWT, plus scopes per consumer
• Rate limiting, cursor pagination, filtering and idempotency keys on writes
• Unit, integration, contract and load tests, run in CI
• Interactive docs and a Postman collection your developers can use on day one

How should a REST API handle versioning and pagination?

Put the major version in the path (/v1/orders) and only ever add to it: new optional fields and new endpoints are safe, while renaming or removing a field is a breaking change that belongs in /v2. When a version is retired we announce a date, return Deprecation and Sunset headers, and keep the old version serving until your clients have moved.

For pagination, cursor (keyset) pagination beats page numbers once a list grows or changes while someone is reading it: the client passes the last ID it saw, so no rows are skipped or repeated and the database query stays fast at page 5,000. Offset pagination is kept for small admin lists where jumping to a page number matters.

API keys, OAuth 2.0 or JWT - how should a REST API authenticate?

They solve different problems. API keys identify a server calling your API - a partner's backend, an internal job - and are the simplest thing to issue, rotate and rate-limit per customer. OAuth 2.0 is for a third-party app acting on behalf of one of your users; mobile and single-page apps use the authorization code flow with PKCE. JWTs are a token format, usually the short-lived access token OAuth issues, which lets each request be checked without a database lookup.

Authentication is only half of it. The most common REST API flaw in the OWASP API Security Top 10 is broken object-level authorization: a logged-in user changing /orders/123 to /orders/124 and reading someone else's order. Every Miracuves endpoint checks that the caller owns the object it asks for, and that check has its own tests.

REST, GraphQL or gRPC - which fits your product?

REST is the right default when outside developers, partners or several apps will call your API: it uses plain HTTP, caches well behind a CDN, and every language and tool understands it. GraphQL earns its extra complexity when many clients need differently shaped views of the same data and you are tired of adding an endpoint per screen - our GraphQL API development team builds those. gRPC fits calls between your own services, where binary messages and generated clients matter more than browser access; that belongs with microservices development.

Mixing is normal. A common Miracuves setup is REST for the public API, WebSocket for live order or chat updates, and gRPC between internal services, all behind one gateway.

How do you integrate third-party APIs into a REST backend?

Payments, KYC, SMS, maps, shipping and accounting APIs each fail in their own way, so each gets an adapter in our code rather than direct calls scattered through the app. The adapter handles the provider's auth, retries with backoff on timeouts, and translates its errors into yours, so swapping one SMS or payment provider for another touches one module.

Incoming webhooks are verified by signature before anything is trusted, stored, and processed from a queue so a slow handler never makes the provider retry. Outgoing payment calls carry idempotency keys, so a retried request never charges a customer twice. Every integration is built against the provider's sandbox first, and the production keys go into your secrets manager, never into the repository.

What does REST API development cost, and how long does it take?

Custom API work starts from $3,699, depending on the work. A custom REST API MVP typically costs $8,000-$25,000 and takes 2-8 weeks. The number of resources, the consumers (only your apps, or partners and public developers too), the auth model, real-time features and the number of third-party integrations decide where it lands; larger scopes are quoted in writing before work starts. Ongoing API work is from $2,299/month.

If your product matches one of our 90+ ready-made platforms, you skip most of that: the platform ships with its REST backend, web app, admin panel and mobile apps in 6 working days at the fixed price shown in Pricing, and custom endpoints are added on top. Running costs are separate - hosting, the gateway, monitoring and any per-call fees your providers charge.

Should you hire REST API developers or an API development company?

Hire in-house when the API is the product itself and you will change it every week for years; a senior backend engineer who owns the contract is worth it. Hire a company when you need the API designed and shipped with security, docs and load tests in place, and a team does not exist yet.

Either way, test the candidate the same way. Ask to see an OpenAPI spec from a past project, how they version breaking changes, where rate limits and authorization checks live, and what the handoff contains. At Miracuves the answer to the last one is the full source code, the spec, the Postman collection and the infrastructure code - so your own developers can take over whenever you are ready.