Custom API development and integration services built on process, not promises.
Too many businesses operate on brittle API integrations held together by undocumented endpoints, workarounds from contractors who left, and vendors who disappear after go-live. That’s not a custom API development and integration services strategy, it’s accumulated technical debt compounding with every new platform you add.
Since 2004, Dot Com Development has delivered custom API development and integration services for national brands, scaling companies, and enterprise operations across healthcare, manufacturing, retail, and financial services. As a U.S.-based API development company and REST API development company, we bring the same team from discovery through delivery … no handoffs, no surprises, no open-ended billing.
20+
Years U.S.-Based
API Development Company
$0
Cost overruns
fixed-price every time
100%
Projects delivered fully documented
Loop News Mobile
Overhauling Mobile News Delivery with AI-Enabled Personalization and Engagement
-
58%
faster editorial workflows -
92%
crash-free sessions -
1M+
active monthly users -
45%
boost in social shares
Custom API Development & Integration Services
API Development & Integration Services
REST API Development.
Third-Party Integration. Enterprise API Management.
Whether you need custom API development and integration services from scratch, complex third-party API integration across ERP, CRM, and payment platforms, or an enterprise API management layer, Dot Com Development delivers it on-time and on a fixed-cost basis.
3
Core service areas
15+
Service capabilities
3.4x
Avg. efficiency gains
Custom API
Development
Purpose-built REST APIs and GraphQL services designed around your business logic.
REST API
Design & Development
Versioned, OpenAPI-spec REST APIs with authentication, rate limiting, and full docs.
GraphQL API
Development
Flexible query architecture for precise data fetching, subscriptions, and reduced payloads.
Microservices
API Architecture
Independently deployable microservices with clean API contracts built for scale and resilience.
Webhook &
Event-Driven APIs
Real-time webhook systems that eliminate polling and reduce infrastructure costs.
API Security
& Authentication
OAuth 2.0, JWT, RBAC, and zero-trust patterns applied consistently across every endpoint.
Third-Party API
Integration
Replace manual exports and fragile connections with reliable, integration pipelines that run automatically.
ERP & CRM
API Integration
Bidirectional real-time sync between Salesforce, HubSpot, SAP, and your custom platforms.
Payment Gateway
Integration
Stripe and Authorize.Net with PCI-compliant token handling and reconciliation built in.
Shipping & Logistics
API Integration
FedEx, UPS, USPS, and 3PL integrations with real-time rates, labels, and tracking events.
Marketing &
Analytics Platforms
Clean event pipelines into Klaviyo, Marketo, GA4, and custom BI stacks without broken data.
EDI & Legacy System
Integration
Modern REST wrappers around EDI 850 / 855 / 856 and SOAP protocols maide maintainable.
Enterprise API Platform
& Management
Observability, governance, and operational scaffolding that keeps your API layer performant and improvable.
API Gateway
Architecture
AWS, Kong, and Azure APIM with traffic shaping, caching, and centralized logging configured.
Monitoring
& Alerting
Uptime tracking, latency dashboards, and error rate alerting so problems surface immediately.
Developer Portal
& Documentation
Interactive OpenAPI docs, and sandbox environments that make your API adoptable.
API Audit &
Rescue Services
We assess, stabilize, and rebuild broken API codebases with zero-downtime.
AI-Augmented
API Development
LLM endpoints and AI middleware that bring generative AI into your existing API architecture.
Every system connected, documented & delivery warranted.
From custom REST API development to enterprise integration across ERP, CRM, and beyond, DCD delivers API’s your team can maintain, extend, and build on long after launch.
Customer Success Stories
Real results from custom API development and third-party integration projects delivered on time, on budget, and on scope.
SRMG Verify
Driving Accuracy and Efficiency in Concrete Shipment Tracking
-
70%
fewer delivery discrepancies -
85%
faster confirmations -
90%
logistics team adoption -
84%
increase in visibility
Moon Valley Nurseries
Cultivating Seamless, Location-Aware Ecommerce Across Coasts
-
52%
faster store routing -
37%
more product views -
61%
more checkouts -
42%
more mobile purchases
How We Build Them
Architecture-First API Development. Every Time.
Every DCD custom API development engagement begins with a documented system architecture … endpoints, auth patterns, data contracts, and integration points defined and approved before coding begins. What you see in the proposal is what gets built.
1,275+
APIs & integrations
in production
38ms
Average
response time
99.9%
Uptime SLA
across all live systems
Custom API Development Services Across Every Industry
Our custom API development and integration services span healthcare, retail, logistics, and beyond — each with its own compliance requirements, legacy systems, and data models. The engineering rigor never changes.
20+
What Clients Say About Our API Development Services
They have been invaluable to us. Dot Com not only brings impressive web, mobile and AI expertise to the table, but also collaborates and advises when we need. We are happy to recommend them to others.
Niko Kahn
Senior Head of Product Development. Digicel Group, LTD
A scalable API architecture tripled our adoption in just six months. Their technical expertise and support allowed us to expand integrations confidently.
Kevin Yang
Director of Applied Technology, Genentech
API Development & Integration Services
What does a custom API development project with DCD actually include?
Every custom API development engagement at DCD begins with a documented system architecture — all endpoints, authentication patterns, integration data contracts, and a fixed price defined and approved before development begins. Deliverables include the working REST or GraphQL API, full OpenAPI documentation, a staging environment, load testing, and a post-launch warranty period. No open-ended billing, no scope surprises, and no vanishing after go-live. What you see in the proposal is what gets built.
How much does a custom API development or integration project cost?
Custom API development and third-party integration costs vary based on complexity, but here are honest benchmarks. A single third-party API integration — connecting a payment gateway, CRM, or shipping carrier — typically runs $10,000 to $40,000. A multi-system enterprise API integration layer connecting 4–10 platforms runs $40,000 to $150,000. Complex enterprise API ecosystems with custom microservices architecture and compliance requirements can run higher. Every DCD engagement is fixed-cost — you'll have an exact number in writing before any commitment is made. No open-ended time-and-materials billing, ever.
Do you have API development and integration experience in our industry?
Likely yes. DCD has delivered custom API development services and enterprise integration solutions across healthcare, manufacturing, retail and eCommerce, financial services, logistics, construction, education, and government — each with its own compliance frameworks and legacy system constraints. Healthcare API integration requires HIPAA compliance and FHIR R4 standards. Payment API integration requires PCI-DSS. Manufacturing and logistics require EDI and ERP API integration across platforms like SAP, NetSuite, and major 3PL carriers. We don't learn your industry on your project — we have already delivered in it.
We've been burned by API projects before. How is DCD different?
Most custom API development and integration project failures come down to three things — vague scope that expands after signing, offshore handoffs that create communication gaps, and zero documentation left behind when the project closes. DCD addresses all three directly. We scope every API development project to a fixed price before work begins. We use the same U.S.-based team from discovery through delivery — no offshore handoffs, no revolving developers. Every REST API, GraphQL service, and third-party integration we ship comes with complete OpenAPI documentation your team can actually use. If our work breaks within the warranty period, we fix it at no charge.
How long does an API development or integration project take?
Here's the updated FAQ 4:
FAQ 4 Q: How long does an API development or integration project take?
A single third-party API integration typically takes 2–4 weeks. A multi-system middleware layer connecting 4–10 platforms through a custom API integration layer runs 6–12 weeks. Complex enterprise API development projects with microservices architecture, compliance requirements like HIPAA or PCI-DSS, and full documentation can run 3–5 months. Our development process incorporates AI-assisted coding workflows alongside experienced U.S.-based engineers — which consistently compresses timelines without compromising architecture quality or documentation standards. The timeline in our fixed-cost proposal is accurate — it is not a number we revise upward after you have signed.
Do you offer white-label API development services for agencies?
Yes — and DCD has been a white-label API development and integration partner for digital agencies for over 15 years. If you are an agency that needs a reliable U.S.-based API development company to execute under your brand, we operate with full discretion. We work under your brand, protect your client relationships, and price our white-label API development services to support your margin. Your clients will never know we are involved unless you want them to. We are the API development team behind more agencies than we are permitted to name.
Let’s connect your
systems and strategy.
Tell us what systems need connecting. We'll come back with a fixed-cost API development scope before you commit to anything.
Contact Us Today.
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