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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8,490 Companies

List of the Best API Development & Integration Agencies

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Omnitoria
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We are an app publishing company focused on simplifying the lives of Administrators through our applications offered on the Salesforce AppExchange. We collaborate with Salesforce partners who recognize the significance of connecting to the Salesforce platform and enhancing value for their clients. O
Highlights
2-9
Employees
Services Provided
25% Custom Web Application Development
55% API Development & Integration
20% SaaS Product Development
AI Summary
“Omnitoria develops Salesforce AppExchange applications that streamline administrative tasks and collaborates with partners to facilitate efficient integration and enhanced client value.”
Inereto
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Collaborating with this team feels like having tech geniuses right at your fingertips. Their CRM doesn’t just function—it brings energy! 🎵 Is it dependable? Absolutely. Does it integrate seamlessly? You bet. But the best part is how they infuse excitement into the process, making you feel part of a
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
43% CRM Consulting and SI
7% Other IT Consulting and SI
50% API Development & Integration
AI Summary
“Inereto offers reliable, seamlessly integrated CRM solutions characterized by enthusiastic support and innovative technology, enhancing workflow efficiency and collaborative client partnerships.”
AutomateNexus
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AutomateNexus is an AI automation agency owned by veterans, specializing in creating custom AI agents, workflow automations, and smart business systems tailored for small and medium-sized enterprises. Unlike conventional agencies that require clients to commit to monthly fees, AutomateNexus utilizes
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
18% AI Agent & Multi-Agent System Development
7% AI Strategy & Roadmap Consulting
15% Custom AI Chatbot Development
5% Machine Learning Model Development
AI Summary
“AutomateNexus, a veteran-owned AI automation agency founded in 2025, delivers custom AI agents and workflow solutions for SMEs across industries, emphasizing client ownership and transparency.”
ZELQAR
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Zelqar assists small and medium-sized enterprises in streamlining their workflows by automating repetitive tasks that hinder their progress. We create customized automation solutions that perform manual tasks without the need for complex enterprise software. Our automation services include: • Email
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lahore, Pk Punjab, Pk
Services Provided+1 Services
5% AI Strategy & Roadmap Consulting
20% Custom AI Chatbot Development
5% AI Agent & Multi-Agent System Development
20% CRM Consulting and SI
AI Summary
“Zelqar delivers tailored automation solutions that streamline workflows for SMEs across various industries, enhancing efficiency by automating repetitive tasks and integrating seamlessly with existing tools.”
UBM SOFT
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UBM SOFT - ваш надійний партнер у запровадженні та підтримці Odoo ERP. Наша компанія допомагає бізнесам переходити на сучасні управлінські стандарти шляхом автоматизації процесів CRM, ERP та BPM. Ми пропонуємо індивідуальні рішення, які відповідають вашим бізнес-цілям, завданням та планам зростання,
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Cherkasy, Cherkasy, Ua
Services Provided
15% Other IT Consulting and SI
18% CRM Consulting and SI
17% ERP Consulting and SI
50% API Development & Integration
AI Summary
“UBM SOFT specializes in implementing and supporting Odoo ERP, delivering customized CRM, ERP, and BPM automation solutions to enhance business management and growth.”
PerryLabs
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PerryLabs is a consultancy focused on artificial intelligence that assists organizations in leveraging AI through effective strategy, quick prototyping, and smart systems. We collaborate with companies at all phases of their AI journey, from establishing strategies and aligning leadership to develop
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
13% Generative AI
15% Machine Learning Model Development
10% LLM Integration & Prompt Engineering
5% Custom AI Chatbot Development
AI Summary
“PerryLabs is an AI consultancy offering strategic guidance, tailored development, and ongoing optimization to help organizations integrate and leverage artificial intelligence for impactful business results.”
Abotly Ltd
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Abotly focuses on creating personalized AI voice agents that revolutionize how companies manage their customer communications globally. Our hyperrealistic voice AI solutions operate continuously, capturing leads, scheduling appointments, offering customer support, and boosting conversions without an
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
London, England, Gb
Services Provided+2 Services
20% AI Agent & Multi-Agent System Development
3% Custom AI Chatbot Development
5% LLM Integration & Prompt Engineering
5% AI Strategy & Roadmap Consulting
AI Summary
“Abotly Ltd. develops personalized AI voice agents and conversational AI solutions that automate customer communications, enhance lead generation, support, and workflow automation across diverse industries globally.”
Prodevo
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Premium tech services that prioritize talent and efficiency to guarantee project success across the US, Mexico, and Latin America. Our foundation consists of two key elements: 1. **Talent Specialization** - We cultivate and oversee exceptional talent, providing committed and motivated experts for
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ciudad de Mexico, Mx
Services Provided
50% API Development & Integration
35% IT Staff Augmentation
15% Other IT Consulting and SI
AI Summary
“Prodevo delivers premium tech services across the US and Latin America, specializing in Ruby and DevOps with fractional CTOs, software development, and staff augmentation, emphasizing talent and efficiency.”
Copiq
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Transforming an idea into multi-format publishing takes just minutes. There are too many separate systems leading to duplicated workflows and reports. The process is too slow, with lengthy launches and delays in scaling. This results in a waste of talent as experts are tied up in repetitive tasks. T
Highlights
$100-149/hr
Avg Hourly Rate
2-9
Employees
Manchester, England, Gb
Services Provided
50% API Development & Integration
35% Content Marketing Strategy
15% Social Media Marketing
AI Summary
“Copiq streamlines multi-format content creation through a unified platform integrating AI and human oversight, enabling rapid, scalable publishing with centralized control, predictable spending, and comprehensive performance tracking.”
Gregory Advisory Plus Ltd
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At Gregory Advisory Plus, we connect intricate technology solutions with your financial goals. Whether you require a quick resolution for an urgent problem or a strategic plan for digital transformation, our team offers extensive experience across multiple industries. We understand that employing a
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Derby, England, Gb
Services Provided
30% Other IT Consulting and SI
20% Cloud Consulting & SI
50% API Development & Integration
AI Summary
“Gregory Advisory Plus delivers expert Architecture as a Service, aligning advanced technology solutions with financial objectives for diverse industries, supporting businesses cost-effectively without full-time IT staff.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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