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

Rendesweb Kft.
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
A Rendesweb Kft. 2008 óta dolgozik megbízható és stabil webes megoldások kifejlesztésén. Egy összeszokott, 11 fős fejlesztői csapat vagyunk, akik hosszú távú kapcsolatokra törekednek partnereinkkel. Meggyőződésünk, hogy a következetes, átlátható munka és a részletesen dokumentált fejlesztési folyama
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Budapest, Budapest, Hu
Services Provided
20% API Development & Integration
30% Custom Web Application Development
50% DevOps Engineering
AI Summary
“Rendesweb Kft., established in 2008, is a reliable 11-person web development team focusing on transparent, well-documented processes and long-term client partnerships for stable web solutions.”
Akurateco
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Akurateco is an international provider of payment software that assists businesses in developing, managing, and enhancing their payment systems. The firm offers a unified integration that connects to over 600 payment service providers and acquirers, allowing merchants, payment service providers (PSP
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Samora Correia, Santarem, Pt
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Cloud Consulting & SI
AI Summary
“Akurateco provides global payment software solutions integrating 600+ providers, enhancing payment performance, boosting approval rates, and enabling businesses to efficiently scale and manage payment systems.”
B
ByteBrew Technologies
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
ByteBrew Technologies is a contemporary technology development partner that focuses on Staff Augmentation and Lean Product Development. We aim to restore confidence in outsourcing by offering verified and transparent talent for startups, SaaS platforms, and enterprise teams. With over a decade of ex
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+1 Services
30% Software Development Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% API Development & Integration
AI Summary
“ByteBrew Technologies excels in custom software solutions, offering web and mobile app development alongside API integration and DevOps services, making it a strong fit for the Software Development category through their verified developers and product pods.”
BroSolutions
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
BroSolutions is a certified development agency for Magento (Adobe Commerce) and Shopware, and a participant in the Adobe Solution Partner Program. We provide comprehensive development services, so whether you are launching a brand-new online store or enhancing an existing one, we can assist you. Sin
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Kharkiv, Kharkiv, Ua
Services Provided
70% E-Commerce Development
20% Custom Web Application Development
10% API Development & Integration
AI Summary
“BroSolutions is a certified Magento and Shopware development agency offering custom ecommerce solutions, migration, optimization, and technical support for global small to medium retailers and agencies.”
Naturaily
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a technology company based in Poland with over 13 years of experience in web design and e-commerce development. Our expertise lies in delivering quick, scalable, and adaptable digital solutions for various industries, ranging from headless Shopify stores to SaaS applications and custom websit
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Wroclaw, Pl
Services Provided
50% E-Commerce Development
40% Custom Web Application Development
10% API Development & Integration
AI Summary
“Naturaily is a Polish technology firm specializing in scalable, adaptable digital solutions including web design, e-commerce, and SaaS, dedicated to helping clients achieve business goals through expert guidance.”
2 Red Socks Inc.
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
**2 Red Socks: RevOps Consulting for Scalable Growth** At 2 Red Socks, we assist companies focused on growth in transforming disjointed revenue operations into a cohesive and scalable system that fosters predictable growth. We synchronize people, processes, and technology with the buyer's journey,
Highlights
$10,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
25% API Development & Integration
18% Managed IT Services
7% IT Compliance & Governance
25% Operational Process Consulting
AI Summary
“2 Red Socks Inc. specializes in revenue operations consulting, offering audits, lead management, attribution models, and managed services to align sales, marketing, and technology for scalable, predictable growth.”
Blazity
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We develop enterprise AI agents and workflows on the Vercel AI Cloud, providing production-ready AI systems that integrate governance and efficiency. As a Vercel Certified Gold Partner with over 8 years of engineering experience, our team is dedicated to delivering results. Many businesses struggle
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided+2 Services
10% Custom Web Application Development
18% API Development & Integration
23% Frontend Development
22% AI Agent & Multi-Agent System Development
AI Summary
“Blazity delivers enterprise AI agents and workflows on Vercel AI Cloud, integrating governance and efficiency to optimize business operations with open-source tools and expert engineering.”
BestWebSoft
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are a team of enthusiastic, friendly, and ambitious individuals, including senior web developers, graphic designers, web designers, QA specialists, and project managers. We are continuously refining our team and the strategies we use for project development. With over a decade of experience in th
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Zaporizhzhia, Ua
Services Provided+2 Services
20% API Development & Integration
13% E-Commerce Development
17% Product Design
10% Other Design
AI Summary
“BestWebSoft is a skilled, multidisciplinary team delivering quality web development and design services with over a decade of experience, using modern technologies to meet diverse client needs.”
Decerto
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
Decerto is focused on developing essential software for insurance and financial institutions. We partner with prominent companies like Allianz, Generali, Nationale Nederlanden, Everest, and Send, offering customized IT solutions, which include our two main products. With extensive expertise, we crea
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Warszawa, Masovian, Pl
Services Provided+1 Services
35% Custom Web Application Development
15% API Development & Integration
20% UX Research & Usability Testing
13% UX Audit & Heuristic Evaluation
AI Summary
“Decerto develops scalable, customizable software for insurance and finance, partnering with major companies to deliver efficient, user-friendly solutions supporting complex processes and sustainable growth.”
FICUSIT PTY LTD
View Profile Visit Website
Is this your business? Become an Edverise partner & Claim Now
We are proud to be your IT champions, working alongside you to ensure you feel secure and confident in your digital journey. Our focus is on providing customized IT outsourcing solutions that align with our clients' needs, timelines, and budgets. We streamline the outsourcing process to facilitate o
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Scoresby, Victoria, Au
Services Provided
18% API Development & Integration
32% Custom Web Application Development
50% Managed IT Services
AI Summary
“FicusIT offers customized IT outsourcing solutions including software development, managed services, IT staffing, and scalable offshore teams, supporting clients’ growth through trusted expertise and tailored support.”

...

...

...

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

B

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.