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.

How this list is built

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

Automated Conversions
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
I am an expert in Search Marketing and a developer of PPC automation, with over 8 years of experience working with platforms such as Google Ads (previously Adwords), Facebook Ads, Bing Ads, and LinkedIn Ads. I have managed budgets exceeding $5 million and have extensive experience running campaigns
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Quebec, Quebec, Ca
Services Provided
50% API Development & Integration
35% Pay Per Click
10% Digital Strategy
5% Mobile & App Marketing
AI Summary
“Automated Conversions specializes in PPC automation and digital marketing, delivering custom API development and campaign management to optimize global advertising efficiency and ROI.”
G
GeniusHub
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
At GeniusHub, we focus on transforming your business with customized HubSpot solutions that enhance efficiency, boost productivity, and support sustainable growth. As a committed HubSpot partner, we strive to offer innovative strategies and all-encompassing solutions that fully utilize HubSpot's sof
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
San Francisco, California, Us
Services Provided
23% Custom AI Chatbot Development
20% AI Strategy & Roadmap Consulting
7% CRM Consulting and SI
50% API Development & Integration
AI Summary
“GeniusHub specializes in tailored HubSpot solutions, enhancing business efficiency and growth through expert consulting, customization, and ongoing support aligned with clients' unique needs.”
Opus Technologies
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Opus Technologies delivers digital payment solutions customized for businesses of every size. Their services encompass a full range of payment processing options, allowing companies to receive payments via online, mobile, and in-store methods. The solutions from Opus Technologies focus on enhancing
Highlights
250-999
Employees
Alpharetta, Georgia, Us
Services Provided+1 Services
50% API Development & Integration
13% DevOps Engineering
20% Cybersecurity Assessments & Hardening
10% IT Compliance & Governance
AI Summary
“Opus Technologies offers secure, customizable digital payment solutions supporting online, mobile, and in-store transactions, enhancing business payment experiences across diverse industries with reliable support.”
Propel Digital Partners
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Propel Digital Partners is your reliable ally in leveraging digital marketing and data analytics to expedite your business success. We provide customized solutions that enhance your online visibility and convert raw data into insightful actions. Our committed team collaborates with you to navigate t
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Nairobi, Ke
Services Provided+1 Services
50% API Development & Integration
18% Social Media Marketing
12% Pay Per Click
10% Email Marketing & Automation
AI Summary
“Propel Digital Partners specializes in digital marketing and data analytics, delivering tailored solutions that enhance online presence and convert data into actionable insights for business growth.”
Raddiene
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Software development, system integrations, and team enhancement. Located in Europe and serving clients globally.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Podvinje, Osijek Baranja, Hr
Services Provided
45% API Development & Integration
55% Custom Web Application Development
AI Summary
“Raddiene delivers software development, system integration, and team augmentation services from Europe to global clients, enhancing operational capabilities across diverse industries.”
M40Tech
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Elevate Your Business with M40 Tech's Salesforce Expertise. We are dedicated to facilitating digital transformation through innovative Salesforce solutions. As a reliable consulting and development partner, we help businesses optimize their operations, improve customer relationships, and achieve exc
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
50% API Development & Integration
20% Cloud Consulting & SI
20% CRM Consulting and SI
10% ERP Consulting and SI
AI Summary
“M40Tech specializes in delivering tailored Salesforce consulting, custom development, integration, and managed services to optimize business operations and enhance efficiency across industries.”
Tellestia Technologies
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Tellestia is a consulting firm specializing in technology that assists businesses in linking their systems, data, and applications. We focus on API integration and iPaaS (Integration Platform as a Service) solutions that facilitate information sharing across various tools and platforms. Our team col
Highlights
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+1 Services
50% API Development & Integration
5% IT Staff Augmentation
5% BI & Big Data Consulting & SI
10% Cloud Consulting & SI
AI Summary
“Tellestia Technologies is a consulting firm specializing in API integration and iPaaS solutions, helping businesses streamline processes, connect systems, and support digital growth.”
Gridkoss
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Grid is a leading AI development firm focused on developing groundbreaking solutions that enhance efficiency, scalability, and effectiveness. With a strong background in machine learning, automation, and bespoke AI tools, we assist businesses in turning challenges into opportunities, providing custo
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Prishtina, Xk
Services Provided+2 Services
10% AI Strategy & Roadmap Consulting
10% Custom AI Chatbot Development
15% Machine Learning Model Development
10% Conversational AI & Voice Assistant Development
AI Summary
“Gridkoss is a leading AI development firm specializing in machine learning, automation, and custom AI solutions, enhancing business efficiency, scalability, and effectiveness with tailored, accurate results.”
Vaysed
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Vaysed is a top-tier Telegram Bot Development Agency boasting more than 5 years of expertise. We excel in creating personalized, scalable bot solutions designed to meet your specific business requirements, utilizing Node.js and Python. Our capabilities range from effortless payment integrations (Str
Highlights
2-9
Employees
Services Provided+1 Services
25% Workflow Automation (Zapier / Make / n8n)
5% AI Agent & Multi-Agent System Development
5% Robotic Process Automation (RPA)
15% Custom AI Chatbot Development
AI Summary
“Vaysed is an experienced Telegram bot development agency specializing in custom, scalable solutions using Node.js and Python, integrating payments, APIs, LMS, and e-commerce automation.”
Virtuebyte Pvt Ltd
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Virtuebyte specializes in cloud computing and AI/ML, offering innovative, tailored solutions that drive digital progress across various sectors. Backed by top-tier software security and compliance standards, our skill set encompasses DevOps, Cloud Computing, Machine Learning, and Artificial Intellig
Highlights
$1,000+
Min Project Size
10-49
Employees
Pune, Maharashtra, In
Services Provided+4 Services
10% AI Strategy & Roadmap Consulting
10% LLM Integration & Prompt Engineering
8% Custom AI Chatbot Development
8% AI-Powered Document Processing
AI Summary
“Virtuebyte Pvt Ltd. delivers customized cloud computing and AI/ML solutions across diverse industries, leveraging expertise in software security, DevOps, and advanced technologies to solve complex business challenges.”

...

...

...

Latest insights & expert perspectives

Explore data-backed surveys with inputs from top industry experts.

Stated minimum project sizes among the firms listed under software development services on Edverise, with the $50,000 band shaded

Vendor Selection

Questions to Ask a Software Development Agency: Six With Proof

A vetting script for second-round agency calls: six questions, the document each answer has to produce, and what a directory listing or a badge really proves.

Nihar Ranjan Rout

10/31/2026

Three software development quotes of $38,000, $94,000 and $210,000 converted to effective hourly rates of $79, $73 and $87.50

Vendor Selection

How to Compare Software Development Quotes Priced 5x Apart

Three bids for the same build are rarely comparable as written. A normalization checklist, a weighted grid adapted from FAR Part 15.3, and the hourly arithmetic.

Akash Mohapatra

10/31/2026

Chart of minimum project size stated by firms listed under AI agent development on Edverise, with the $50,000 band highlighted

Vendor Selection

AI Agent Development Cost: Build, Tokens, Reliability

An AI agent has three costs. Compute the monthly token bill from published list prices, then set the build quote against what listed firms actually charge.

Santanu Prasad Sahoo

10/31/2026

Check All Our Blogs

One Platform. One Promise. One Trust.

Edverise is building the trusted way to find tech vendors. List your company early, or talk to us about backing the platform.

Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

G

Where buyers look next

Latest insights & expert perspectives

Questions to Ask a Software Development Agency: Six With Proof

How to Compare Software Development Quotes Priced 5x Apart

AI Agent Development Cost: Build, Tokens, Reliability

One Platform. One Promise. One Trust.