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

PONCE
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
At PONCE, we transform intricate challenges into effective solutions, fueled by a true passion for meaningful technology. Our vibrant and dedicated team, supported by extensive industry expertise, delivers impactful results. Innovation is at the core of who we are; we not only observe trends but als
Highlights
2-9
Employees
Mar del Plata, Buenos Aires, Ar
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% AI Agent & Multi-Agent System Development
AI Summary
“PONCE delivers innovative technology solutions by integrating AI and industry expertise, focusing on adaptable, efficient tools that blend agility with technical precision for lasting impact.”
BitBag
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
BitBag is a software development company that creates customized eCommerce platforms, providing a complete range of services from building eCommerce sites and implementing PIM and CMS systems to developing tailored eCommerce applications, B2B solutions, and migrating from other platforms. We offer s
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Wroclaw, Lower Silesian, Pl
Services Provided+1 Services
40% E-Commerce Development
30% Custom Web Application Development
15% Backend Development
10% API Development & Integration
AI Summary
“BitBag specializes in customized eCommerce solutions, leveraging Sylius and Shopware frameworks along with modern technologies, delivering scalable, reliable platforms and open-source tools tailored to diverse client needs.”
Smarten Technologies
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Smarten’s mission is to drive rapid and sustainable business growth for our clients by developing and executing innovative strategies. Smarten Technologies offers a detailed proposal for implementing the Odoo ERP solution to meet the operational requirements and challenges our clients face. As a Sil
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+1 Services
17% API Development & Integration
3% E-Commerce Development
14% Mobile App Development (iOS & Android)
33% CRM Consulting and SI
AI Summary
“Smarten Technologies, an ISO-certified Silver Reseller Partner of Odoo ERP in Nepal, delivers customized ERP solutions and innovative strategies to drive sustainable business growth globally.”
HonesIT
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Why Choose HonesIT? 1. Customized Approach and Initial Validation Before commencing development, we assist our clients in validating and testing their concepts. Rather than investing $10,000–$20,000 in a full-scale development project, we start with a Figma prototype. This prototype can be shared
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
20% API Development & Integration
40% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“HonesIT offers customized software development with expert senior developers, emphasizing prototype validation, transparency, and long-term client partnerships to optimize business solutions efficiently.”
E
Eternal IT Solutions
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Eternal IT Solutions is a reliable technology partner focused on SAP services, cloud solutions, and enterprise digital transformation. With extensive knowledge in SAP BTP, integration, automation, and AI-based innovations, we assist organizations in optimizing operations, boosting growth, and achiev
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+7 Services
25% API Development & Integration
10% Architectural Design
15% Product Design
9% Robotic Process Automation (RPA)
AI Summary
“Eternal IT Solutions specializes in SAP services, cloud computing, and digital transformation, enabling organizations to enhance operations, integrate technologies, and drive business growth efficiently.”
Expert Network
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Expert Network offers innovative digital solutions for forward-thinking businesses. With our expertise in DevOps, cutting-edge technology integrations, and a skilled, committed team, you can be confident that your business will achieve significant impact and sustainable growth. We deliver a adaptabl
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Iasi, Iasi, Ro
Services Provided+3 Services
20% Custom Web Application Development
13% Mobile App Development (iOS & Android)
12% API Development & Integration
5% QA & Software Testing
AI Summary
“Expert Network delivers innovative digital solutions emphasizing DevOps and technology integration, collaborating closely to ensure efficient, reliable, and cost-effective strategies for sustainable business growth.”
Easy Software
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We create, build, and deploy web applications to help businesses worldwide go digital. By utilizing agile methodologies, we convert your challenges into creative solutions tailored specifically to your company.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Rosario, Santa Fe, Ar
Services Provided
50% Custom Web Application Development
15% API Development & Integration
20% Backend Development
15% Frontend Development
AI Summary
“Easy Software develops and deploys customized web applications using agile methodologies, enabling businesses worldwide to embrace digital transformation with tailored, innovative solutions.”
d-one
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a specialized software development agency dedicated to creating effective, efficient, and user-friendly digital solutions that provide real value. Our client-centric philosophy, emphasis on innovation, and dedication to making a significant impact distinguish us from others. We build strong p
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Novi Sad, Vojvodina, Rs
Services Provided+1 Services
20% Custom Web Application Development
10% API Development & Integration
10% Backend Development
10% Frontend Development
AI Summary
“d-one is a software development agency specializing in user-centric, innovative digital solutions that address business challenges through tailored, impactful, and collaborative partnerships.”
Idextrus Inc.
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Idextrus is a performance-driven software and infrastructure development firm with more than 20 years of experience. We offer and support solutions for both B2B and B2C markets that help our clients generate hundreds of millions of dollars each year. As AWS certified solutions architects, we priorit
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Collingwood, Ontario, Ca
Services Provided+1 Services
17% Custom Web Application Development
14% API Development & Integration
3% E-Commerce Development
33% DevOps Engineering
AI Summary
“Idextrus Inc. is a software and infrastructure development firm with 20+ years of experience, delivering cost-efficient AWS solutions that enhance profitability and provide reliable client support.”
ExpressTech Software Solutions
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
eCommerce | Membership | Subscriptions | AI + Automation PORTFOLIO: At ExpressTech, we go beyond simply creating websites; we design eCommerce ecosystems that flourish. Our comprehensive range of services covers all aspects of WooCommerce development, guaranteeing an impressive digital storefront. C
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Indore, Madhya Pradesh, In
Services Provided
43% E-Commerce Development
7% API Development & Integration
50% Generative AI
AI Summary
“ExpressTech Software Solutions specializes in WooCommerce eCommerce development and generative AI integration, delivering customized, intelligent digital storefronts that enhance user engagement and business automation.”

...

...

...

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

E

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.