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

KorrAI
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TRAIL is KorrAI's AI-driven platform designed for desktop risk assessments, investment choices, hazard detection, and ongoing monitoring throughout the entire project lifecycle. It consolidates geospatial data, geotechnical analyses, satellite InSAR data, catastrophe model results, and engineering d
Highlights
10-49
Employees
Halifax, Nova Scotia, Ca
Services Provided
15% AI Agent & Multi-Agent System Development
35% Custom AI Chatbot Development
40% API Development & Integration
10% Legacy System Modernization
AI Summary
“KorrAI's TRAIL platform integrates geospatial and engineering data with AI to support critical infrastructure risk assessments, investment decisions, and monitoring for diverse industries globally.”
Weblogiko
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We offer Software Engineering and Data Services to clients around the globe, utilizing agile methodologies to produce top-notch code, reports, and systems. Located in Brazil, we can align our working hours with companies in North America and Western Europe.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Balneario Camboriu, Santa Catarina, Br
Services Provided
50% Custom Web Application Development
40% API Development & Integration
10% Legacy System Modernization
AI Summary
“Weblogiko delivers agile software engineering and data services globally, providing high-quality code and reports while aligning work hours with North American and Western European clients.”
Nexttech
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Nexttech is a software development and IT consulting firm specializing in the Trading, Banking, Insurance, and Automotive sectors. Our dedicated team is enthusiastic about technology, continually learning and innovating to drive results. We prioritize providing outstanding and competitive business s
Highlights
50-249
Employees
Cluj-Napoca, Cluj, Ro
Services Provided
65% Custom Web Application Development
35% API Development & Integration
AI Summary
“Nexttech is a software development and IT consulting firm specializing in Trading, Banking, Insurance, and Automotive sectors, providing tailored, innovative business solutions to Fortune 500 clients.”
Codekernal
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It is a medium-sized software company that specializes in WordPress and Laravel. We create everything from small web applications to large custom CRM systems and also handle API integrations.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Mirpur Khas, Pk
Services Provided
65% Custom Web Application Development
35% API Development & Integration
AI Summary
“Codekernal is a medium-sized software firm specializing in WordPress and Laravel, delivering solutions from small web applications to large custom CRM systems with API integrations.”
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Bonyfer Studios
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Greetings, Universe!
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided
50% API Development & Integration
50% Mobile App Development (iOS & Android)
AI Summary
“Bonyfer Studios is a creative company focusing on delivering innovative visual and multimedia content, fostering engagement through unique storytelling and artistic expression across diverse platforms.”
BainariX
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We are a dedicated group of tech enthusiasts, architects, and developers focused on driving digital transformation and achieving operational excellence. With extensive experience in scalable software engineering, we excel in creating intelligent enterprise applications and developing specialized pro
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
60% Custom Web Application Development
40% API Development & Integration
AI Summary
“BainariX specializes in scalable software engineering, delivering cloud-native, microservices-based enterprise applications, including advanced solutions in warehouse and pharmacy management for digital transformation.”
ZedStack
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We create Conversational AI Avatars and Generative AI Image technologies. Additionally, we design Full Stack Web and Mobile Applications that utilize CI/CD solutions.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% API Development & Integration
60% Mobile App Development (iOS & Android)
AI Summary
“ZedStack specializes in developing Conversational AI Avatars, Generative AI Image technologies, and full-stack web and mobile applications leveraging CI/CD solutions for enhanced deployment.”
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Safe Online Billing Limted
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Safe Online Billing is a family-owned business in the UK that specializes in billing software designed for telecom resellers. Since 2005, we have been addressing billing issues within the UK telecom sector. Our SAFE Billing Platform streamlines the entire billing process, handling everything from th
Highlights
2-9
Employees
Manchester, England, Gb
Services Provided
60% Custom Web Application Development
40% API Development & Integration
AI Summary
“Safe Online Billing Limited offers UK-focused, GDPR-compliant billing software for telecom resellers, automating CDR processing, invoicing, payments, and tax management, reducing billing tasks significantly.”
Eslot Global
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Eslot Global is a provider of technology-driven iGaming SaaS and whitelabel platforms, offering scalable, secure, and customizable solutions for casinos and betting operators around the globe. We provide comprehensive iGaming infrastructure, which includes casino whitelabel platforms, betting exchan
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Willemstad, Cw
Services Provided
40% API Development & Integration
35% Custom Web Application Development
5% E-Commerce Development
20% Mobile App Development (iOS & Android)
AI Summary
“Eslot Global delivers scalable, secure iGaming SaaS and whitelabel platforms with advanced integrations, supporting casinos and betting operators in launching and expanding globally through innovative technology.”
Two Clouds
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TwoClouds develops tailored software and integrates B2B systems to streamline your business operations using cloud technology, ERP, CRM, and Sage solutions.
Highlights
2-9
Employees
Belfast, Northern Ireland, Gb
Services Provided
50% Custom Web Application Development
40% API Development & Integration
10% E-Commerce Development
AI Summary
“TwoClouds specializes in developing custom software and integrating B2B systems to optimize business operations through cloud technology, ERP, CRM, and Sage-based solutions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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