Top API Development & Integration Firms

API development and integration firms build the interfaces that let software talk to other software, and wire up the ones that already exist. Work ranges from designing REST, GraphQL or gRPC APIs for a product or partner program to connecting payment gateways, CRMs, ERPs, shipping carriers, messaging platforms and banking or healthcare systems through their published APIs. Companies hire for it when staff retype data between two systems, when partners want programmatic access, or when a monolith is being split into services.

Compare firms here on the systems they have integrated before, the documentation they hand over, and how they handle authentication, versioning and outages when a third-party API fails.

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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

8,490 Companies

List of the Best API Development & Integration Agencies

OneGreenDiary
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At OneGreenDiary (OGD), we create smart digital solutions that enable businesses to operate more efficiently and expand quickly. Our experts focus on bespoke enterprise software development, workflow automation, CRM systems, and process digitization, allowing organizations to prioritize growth while
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Pune, Maharashtra, In
Services Provided
18% API Development & Integration
7% E-Commerce Development
25% Mobile App Development (iOS & Android)
50% ERP Consulting and SI
AI Summary
“OneGreenDiary specializes in custom enterprise software, workflow automation, and CRM integrations, partnering with businesses to deliver scalable, technology-driven solutions aligned with their growth objectives.”
Moonfive
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Moonfive delivers complete web development expertise and offers a thorough solution for businesses. We don't simply provide services; we integrate ourselves as a vital part of your team.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Leeds, England, Gb
Services Provided
25% Custom Web Application Development
18% API Development & Integration
7% Legacy System Modernization
50% BI & Big Data Consulting & SI
AI Summary
“Moonfive provides comprehensive web development solutions, integrating deeply with client teams to deliver tailored services and drive business success through collaborative expertise.”
Lemonpeak
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LemonPeak Technologies is an international supplier of IT and FinTech solutions and services. Our combination of talent and processes, enhanced by AI and ML algorithms, enables you to make an impact throughout your entire business. We foster a people-focused work environment for our employees, offer
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
250-999
Employees
Chennai, Tamil Nadu, In
Services Provided
25% Custom Web Application Development
18% API Development & Integration
7% Mobile App Development (iOS & Android)
50% AI Strategy & Roadmap Consulting
AI Summary
“LemonPeak Technologies is a global IT and FinTech service provider leveraging AI and ML to deliver innovative solutions, fostering talent development and collaborative, balanced work cultures.”
BitsBizz
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We enhance businesses with innovative software solutions, combining experienced knowledge with vibrant new ideas. We refine and improve your processes to make them more efficient, agile, and intelligent—empowering you to achieve your objectives and explore new opportunities. Contact us with your sof
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“BitsBizz delivers innovative software solutions that enhance business efficiency and agility, leveraging expert knowledge and fresh ideas to help clients achieve goals and explore new opportunities.”
MORP
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MORP is a company based in Belgium focused on boosting the growth of organizations by offering a range of IT services. We specialize in everything from implementing new technologies to developing IT strategies and governance frameworks that assist businesses in reaching their objectives.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“MORP, based in Belgium, enhances organizational growth by providing comprehensive IT services, including technology implementation and development of IT strategies and governance frameworks.”
Neko solutions LDA (n10s)
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Neko Solutions (n10s) is a dedicated software development firm specializing in FinTech. Our team is made up of passionate FinTech experts focusing on several key areas: automated investment and trading in both traditional and digital markets, neo banking, and comprehensive payment and transfer syste
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Lisboa, Lisbon, Pt
Services Provided+3 Services
18% Custom Web Application Development
8% Mobile App Development (iOS & Android)
20% API Development & Integration
5% Frontend Development
AI Summary
“Neko Solutions (n10s) is a software firm specializing in FinTech, delivering API platforms, trading strategies, payment systems, and UI/UX design for digital finance solutions.”
Spiral Scout
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Spiral Scout develops AI agent systems and automates production workflows for businesses that require more than just proof-of-concepts. Based in San Francisco, we have a team of over 120 engineers who specialize in AI integration, Temporal-based orchestration, and the modernization of legacy systems
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
San Francisco, California, Us
Services Provided+4 Services
10% Custom Web Application Development
5% E-Commerce Development
15% API Development & Integration
20% Legacy System Modernization
AI Summary
“Spiral Scout, a San Francisco-based firm with 120+ engineers, specializes in AI agent systems, workflow automation, and legacy system modernization, delivering reliable, production-ready solutions since 2010.”
Brisksoft
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Dedicated remote teams focused on your success. Reliable applications you can trust. Engaging websites that capture your audience's attention. Functional and appealing designs. And distinctive brands that leave a lasting impression.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Vadodara, Gujarat, In
Services Provided+1 Services
50% Custom Web Application Development
15% API Development & Integration
15% Mobile App Development (iOS & Android)
10% Software Development Services
AI Summary
“Brisksoft excels in Software Development with expertise in Custom Web Application Development, API Development, and Mobile App Development (iOS & Android). Their comprehensive technical skills and focus on transformative software solutions make them a strong fit for this category.”
Prevaj Consultants Pvt Ltd
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PREVAJ is driven by a commitment to Innovation and Excellence. Our main objective is to "CREATE SUCCESS FOR EVERY CLIENT." We offer comprehensive software consulting, technology solutions, and digital transformation services, encompassing software programming, web development, quality assurance, clo
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Chennai, Tamil Nadu, In
Services Provided+2 Services
20% API Development & Integration
13% E-Commerce Development
17% Mobile App Development (iOS & Android)
20% AI Strategy & Roadmap Consulting
AI Summary
“Prevaj Consultants Pvt Ltd delivers innovative software consulting, digital transformation, and AI-driven solutions, empowering medium to large enterprises with tailored technology services for measurable business success.”
Cuff Digital Labs
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Cuff Digital Labs focuses on promoting your small business and establishing a robust online presence. We serve the City of Casey and its neighboring suburbs.
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided
28% Custom Web Application Development
22% API Development & Integration
50% Search Engine Optimization (SEO)
AI Summary
“Cuff Digital Labs specializes in enhancing small businesses' online presence, offering comprehensive digital marketing solutions primarily serving the City of Casey and surrounding suburbs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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