Amazon’s Selling Partner (SP) API isn’t just a new version of MWS. It’s a more complex, security-heavy system built for modern e-commerce needs. But with that comes steeper integration work and tighter compliance requirements. Whether you're building a custom app, syncing inventory across platforms, or trying to automate tedious order processes, the right SP API partner can save you a lot of trial and error.

In this article, we’ll walk through companies that specialize in exactly that – connecting your systems to Amazon’s backend in ways that are clean, reliable, and built to scale.

 

1. OSKI Solutions

We work with companies that need practical, reliable software connections between systems. When it comes to SP API integration, we treat it like any other part of a larger architecture problem. That means starting with what you're trying to automate, sync, or simplify, and then building the pieces that make those things happen cleanly. Whether it's syncing listings, pulling order data, or pushing fulfillment updates, we’re focused on getting the connection to behave predictably inside your broader tech stack.

We’ve done a lot of this work for clients where speed and scale matter, so we know the value of stable APIs that don’t create new issues down the line. Our process usually combines careful selection of the right endpoints, secure setup, and simple, maintainable logic. We don’t overdo it with unnecessary layers or tools – we just build what’s needed and make sure it works. That goes for full integrations, custom apps, or smaller workflow tools that help teams stay productive.

Key Highlights:

• Emphasis on practical, maintainable integrations
• Ability to handle multi-system data sync and automation
• Flexible architecture based on real business workflows
• Deep experience with cloud, frontend, and backend platforms

Services:

• API integration for listing, order, and fulfillment workflows
• API strategy and endpoint planning
• Serverless and containerized deployment options
• Full-cycle software development and UI/UX
• Ongoing support and integration management

Contact Information:

• Website: oski.site 
• E-mail: contact@oski.site
• LinkedIn: www.linkedin.com/company/oski-solutions
• Address: Estonia, Tallinn, Kaupmehe tn 7-120, 10114
• Phone: +48571282759

 

2. Synesty

Synesty offers a no-code platform for automating Amazon Seller Central processes via the SP API. Their approach focuses on making integration accessible to teams without development backgrounds by using a visual drag-and-drop flow editor. Through their prebuilt steps, users can pull reports, manage orders, update listings, and handle inventory data without writing code. It’s mostly used as a middleware to connect Amazon with ERPs, shops, or external APIs, often combining CSV/XML imports with REST/GraphQL connectors.

Instead of building from scratch, teams use Synesty’s modules to automate frequent data flows like order exports, product uploads, or pricing updates. While it’s optimized for Amazon SP API, it also fits into wider automation strategies involving other marketplaces, cloud storage, or CRM tools. It’s a solid option when the goal is to cut down on manual exports and repetitive sync tasks between platforms.

Key Highlights:

• No-code builder with drag-and-drop integration flows
• Prebuilt SP API steps for common Amazon operations
• Works well with CSV, XML, REST APIs, and GraphQL
• Supports both bulk data updates and granular data sync
• Flexible middleware for linking Amazon with other systems

Services:

• Amazon SP API integration for orders, products, and inventory
• Automation of reporting and data syncing tasks
• Data flow setup between Amazon and ERP/store platforms
• CSV/XML feed processing and transformation
• Visual flow editor and low-code scripting tools

Contact Information:

• Website: synesty.com
• E-mail: sales@synesty.com
• Twitter: x.com/synesty
• LinkedIn: www.linkedin.com/company/synesty
• Instagram: www.instagram.com/synestyDE
• Address: Leutragraben 1, 07743 Jena, Deutschland

 

3. CData

CData focuses on giving businesses structured, real-time access to SP API data across analytics, reporting, and enterprise systems. Their platform isn’t just about connecting one service to another – it’s designed for companies that want Amazon data to flow cleanly into BI tools, databases, or automation pipelines. They support both virtual (live) and replicated (copied) data access, which helps with scaling large reports or joining Amazon data with other sources.

They position the SP API connector as part of a bigger ecosystem of enterprise-grade tools, often used by teams working with Power BI, Tableau, SQL, or ETL platforms. It’s also capable of working with RPA and BPM tools to orchestrate more complex workflows. This makes CData a strong fit for companies that already have data infrastructure in place and want SP API data to plug into it without needing one-off scripts or manual uploads.

Key Highlights:

• Supports both live querying and data replication from SP API
• Integrates with BI platforms like Power BI and Tableau
• Works in ETL/ELT pipelines and automation workflows
• Connects SP API with RPA and BPM systems
• Focus on enterprise-scale performance and governance

Services:

• Amazon SP API data access via JDBC/ODBC/ADO.NET connectors
• Data integration with SQL, cloud warehouses, and analytics tools
• Workflow automation with RPA/BPM tool compatibility
• Metadata tracking, access control, and data lineage tools
• Unified semantic layer for cross-system analytics

Contact Information:

• Website: www.cdata.com
• E-mail: support@cdata.com
• Facebook: www.facebook.com/cdatasoftware
• Twitter: x.com/cdatasoftware
• LinkedIn: www.linkedin.com/company/cdatasoftware
• Instagram: www.instagram.com/cdatasoftware
• Address: 101 Europa Dr. #110, Chapel Hill, NC 27517 USA
• Phone: (919) 928-5214

 

4. API2Cart

API2Cart offers a unified API layer that connects to Amazon SP API and other eCommerce platforms. Their focus is on software vendors who want to access store data (orders, products, customers, etc.) from multiple sources without building each connection individually. Instead of working directly with Amazon’s raw SP API, clients use API2Cart’s normalized methods to read and write data in a consistent format, regardless of the platform behind it.

The service is typically used by companies developing eCommerce tools – CRMs, shipping systems, analytics dashboards – that need store-level data from Amazon and other platforms. It simplifies the process by abstracting the specifics of each API and offering a consistent developer experience across them all. 

Key Highlights:

• Unified API for Amazon SP API plus 40+ eCommerce platforms
• Designed for SaaS vendors and integration partners
• Offers consistent method structure across different platforms
• Helps reduce development time and overhead
• Free trial available for testing integrations

Services:

• Access and manage Amazon SP API data (orders, products, etc.)
• Unified API methods for multi-platform eCommerce integration
• Support for product, customer, order, and price operations
• Webhooks and SDKs for integration into third-party apps
• Developer resources and API documentation for custom builds

Contact Information:

• Website: api2cart.com
• E-mail: manager@api2cart.com
• Address: 11211 Taylor Draper Ln #115, Austin, TX 78759
• Phone: 1-800-224-0976

 

5. Seller Labs

Seller Labs provides tools that are already connected to Amazon’s SP-API and Ad-API, making it easier for sellers and brands to automate key operations. Instead of building direct integrations from scratch, their platform offers pre-connected access to data like orders, listings, financials, and ad performance. Their focus is on helping users get real-time access to this data without having to manually download spreadsheets or deal with Amazon's API setup complexity.

Their systems are built around automation and visibility. They enable programmatic access to reports, campaign adjustments, and account metrics using Amazon’s authorized methods. For sellers managing multiple products or brands, this can be a big time-saver. They also help manage common issues like API throttling or token refresh cycles behind the scenes, so users can focus more on decision-making and less on technical handling.

Key Highlights:

• Tools pre-integrated with Amazon SP-API and Ad-API
• Focus on automation and data access without coding
• Supports campaign updates, order tracking, and performance metrics
• Handles token management, throttling, and compliance in the background
• Useful for brands managing multiple accounts or high volume

Services:

• Order and listing data sync via SP-API
• Access to advertising data and campaign control via Ad-API
• Real-time reporting and business insights
• Automation of manual data tasks
• Compliance with Amazon’s data and security policies

Contact Information:

• Website: www.sellerlabs.com
• Address: 945 North Point Dr #1196 Alpharetta, GA 30022-8266

 

6. eSellerHub

eSellerHub develops tailored solutions using Amazon’s SP-API, mostly for sellers, vendors, 3PLs, and agencies that need to centralize and streamline Amazon-related workflows. They build custom tools to handle everything from inventory updates to advertising insights, all through the SP-API’s secure and structured interface. Their platform supports both Seller Central and Vendor Central, with options to plug into existing systems or build something from scratch.

The team focuses on creating end-to-end solutions like inventory sync tools, order management dashboards, pricing engines, and fulfillment automation. Their service also covers testing environments, granular permission controls, and integration for third-party logistics providers. It's especially relevant for businesses that want a full software layer on top of Amazon’s API, tailored to their operational structure.

Key Highlights:

• Full-cycle SP-API development and integration
• Works with both Seller and Vendor Central
• Strong focus on SaaS tools, custom dashboards, and reporting
• Offers testing environments and security-focused builds
• Serves 3PLs, large brands, and enterprise clients

Services:

• Custom SP-API integrations for order, listing, and inventory management
• Centralized dashboards and reporting tools
• Fulfillment and shipping automation
• Advertising data integration for campaign management

Contact Information:

• Website: www.esellerhub.com
• E-mail: contact@esellerhub.com
• Address: 34173 Gannon Terrace, Fremont, CA, USA, 94555
• Phone: +1 408 600 0534

 

7. APPSeCONNECT

APPSeCONNECT connects Amazon SP-API to ERP, CRM, and eCommerce systems using pre-built integration modules. Their platform is designed to support real-time data exchange between Amazon Seller Central and backend systems like SAP, Salesforce, or Magento. Rather than building custom code, businesses use their integration templates to automate things like inventory sync, order status updates, product listing, and shipping notifications.

What stands out is their focus on security and compliance. They clearly outline how customer data is handled, stored, and encrypted, aligning with GDPR and Amazon’s usage policies. They also support faster deployment through ready-to-launch packages and aim to roll out deeper functionality (like returns and pricing automation) over time. It's a structured option for teams looking to tie Amazon operations into existing infrastructure without needing an in-house dev team.

Key Highlights:

• Connects SP-API with major ERP, CRM, and eCommerce systems
• Pre-built integration templates for faster rollout
• Handles real-time sync for stock, orders, and shipping
• Strong focus on data security and compliance

Services:

• Real-time inventory and order sync with ERP systems
• Automated product listing updates from backend to Amazon
• Shipping and tracking updates synced across platforms
• Support for pricing sync and returns handling
• GDPR-compliant data management and encryption practices

Contact Information:

• Website: www.appseconnect.com
• Facebook: www.facebook.com/appseconnectcorp
• Twitter: x.com/Appseconnect
• LinkedIn: www.linkedin.com/company/appseconnectcorp
• Instagram: www.instagram.com/appseconnect
• Address: 7876 Buffaloberry Rd, Frisco, Texas, 75035, United States
• Phone: +1-469-844-9793

 

8. Ecomsellertool

Ecomsellertool focuses on building tailored tools using Amazon’s SP-API to help sellers automate and scale their operations. Their development work covers a broad range of needs, from order handling and listing management to detailed analytics dashboards. Most of what they offer revolves around helping sellers reduce manual effort and centralize their Amazon activity into clean, manageable systems. They typically work closely with each client to understand specific workflows before putting together a solution.

Their integrations support warehouse management, product sourcing, and reporting – all designed to eliminate repetitive tasks and streamline decision-making. Ecomsellertool doesn’t just connect to SP-API endpoints; they turn those connections into functional applications like profit tracking tools, reimbursement modules, or repricing automations. These tools are often combined into one custom interface so sellers can act faster and more confidently without switching between systems.

Key Highlights:

• Custom SP-API tools built around specific seller workflows
• Automation for inventory, listings, orders, and reimbursements
• Focus on modular solutions that support scale
• Emphasis on simplifying access to actionable insights
• Strong coverage of fulfillment and PPC-related features

Services:

• SP-API integration for inventory, orders, and listing updates
• Profit and keyword analysis dashboards
• Fulfillment and dropshipping automation
• PPC campaign tools and ask-for-review features
• Reimbursement tracking and purchase order support

Contact Information:

• Website: ecomsellertool.com
• E-mail: hello@ecomsellertool.com
• Facebook: www.facebook.com/people/Ecomseller-Tool/100085348083963
• Address: 7100, Stevenson Blvd, Critosphere, Fremont, CA 94538, United States
• Phone:  +1 650 843 9881

 

9. Merto Software Solutions

Merto Software Solutions provides SP-API integration services for sellers, vendors, and other Amazon business partners. Their approach is grounded in process simplification, using automation to reduce time spent on reporting, syncing, and order management. They typically start with a review of a client’s Amazon setup, then build integrations that tie into existing systems like Shopify, WooCommerce, or custom warehouse tools.

Their services are useful for companies looking to replace spreadsheets with real-time sync. From label printing to returns handling, Merto focuses on automation that prevents errors and saves hours each week. They also emphasize security, using encrypted connections and strict access controls in line with GDPR and Amazon’s data requirements. Their work tends to suit teams that want hands-off operations but still need reliability and full visibility.

Key Highlights:

• End-to-end SP-API integration across Amazon entities
• Real-time data sync with existing tools and systems
• Emphasis on reducing manual admin time
• Works with a wide range of tech stacks and fulfillment flows
• Security and compliance built into every integration

Services:

• Order and inventory sync across sales channels
• Daily report automation and scheduled exports
• Custom automations for returns and FBA workflows
• API setup and security consulting
• Label generation and shipping integrations

Contact Information:

• Website: mertosolutions.com
• E-mail: hello@mertosolutions.com
• Facebook: www.facebook.com/mertosolutions
• LinkedIn: www.linkedin.com/company/merto-solutions
• Instagram: www.instagram.com/merto.software.solutions
• Address: 59-60 Thames St, Windsor SL4 1TX
• Phone: +44 7934 887691

 

10. StoreXpertz

StoreXpertz uses Amazon’s SP-API to build integration setups that cover core eCommerce tasks like inventory sync, order automation, and sales analytics. They emphasize flexibility, offering SP-API setups that are tailored to the size and structure of each store. Their goal is to automate the busywork of store management while giving sellers better data to work with.

They also focus heavily on compliance and data security. Their systems follow Amazon’s data protection rules, with internal audits to make sure everything stays in line. This makes them a fit for sellers that handle sensitive customer data or operate at a scale where audit readiness matters. On top of this, StoreXpertz builds custom dashboards to help clients see what’s happening with their listings, inventory, and sales in real time.

Key Highlights:

• Focused on automation, real-time updates, and sync accuracy
• Builds dashboards for custom sales and inventory reporting
• Strong data privacy practices with regular internal audits
• Tailored solutions to fit business size and structure
• Works with SP-API to streamline multi-channel workflows

Services:

• Real-time SP-API integration for orders and inventory
• Sales and customer behavior analytics dashboards
• Customizable listing and product feed sync
• Automated shipment and tracking updates
• Policy-compliant data handling and encryption practices

Contact Information:

• Website: storexpertz.com
• E-mail: help@storexpertz.com
• Facebook: www.facebook.com/storexpertz
• LinkedIn: www.linkedin.com/company/storexpertz
• Instagram: www.instagram.com/storexpertz
• Address: 96 Clinton Avenue Newark, NJ US
• Phone: +1 (609) 281-5203

 

11. MarketRock

MarketRock builds SP-API integrations to help sellers and vendors manage Amazon operations more efficiently. Their approach is technical but practical – they make it easier to hook into Amazon’s ecosystem by wrapping complex API functionality into usable, streamlined connections. Whether it’s syncing inventory, managing orders, or publishing listings with custom attributes per marketplace, their tools are built to fit directly into existing business systems.

They support a wide set of marketplaces and logistics partners, with integrations spanning platforms like Shopify, eBay, and even shipping carriers like FedEx and GLS. Their SP-API solutions include handling catalog creation, order retrieval, and inventory updates. They also offer support for “Enhanced Content” listings and vendor-side functions, helping sellers who want deeper access to Amazon’s backend services without the usual headaches that come with building from scratch.

Key Highlights:

• Covers both Seller and Vendor Central SP-API features
• Connects Amazon with multiple marketplaces and couriers
• Allows customization per marketplace (e.g. titles, pricing)
• Manages listing creation before ASIN generation
• Experienced team of solution architects for integration support

Services:

• SP-API integration for inventory, orders, and catalog sync
• API connections for Enhanced Content and A+ listings
• Marketplace integrations for eBay, Zalando, Yoox, and more
• Courier API integrations (DHL, UPS, FedEx, etc.)
• Support for PIM and ERP system connections

Contact Information:

• Website: www.marketrock.it
• E-mail: dbn@pec.it
• Facebook: www.facebook.com/groups/supportovenditori
• Address: Corso Acqui, 382, 15121 Alessandria (AL), Italia

 

12. Transalis

Transalis offers SP-API integration as part of a broader automation solution for Amazon sellers. Their focus is on ensuring continuity for businesses affected by Amazon’s switch from MWS to SP-API. What sets them apart is their certified status as an Amazon Selling Partner, which allows them to legally handle sensitive data like customer shipping information. That makes their service especially useful for sellers who rely on third-party systems for order processing and fulfillment.

They provide both standalone SP-API integrations and bundled services for sellers that want to automate their Amazon order cycles completely. Their integration covers all the essential SP-API endpoints and includes secure handling of personal identifiable information (PII). The goal is to help sellers keep their automated workflows running without disruptions, especially during the ongoing deprecation of MWS.

Key Highlights:

• Certified Amazon Selling Partner with PII data access
• Focused on full order cycle automation
• Supports businesses migrating from MWS to SP-API
• Offers integration as a standalone or bundled service

Services:

• SP-API integration for order routing and fulfillment
• Secure handling of PII for shipping and delivery automation
• Custom solutions for data automation workflows
• Migration support from MWS-based systems
• Integration with Seller Central and business backend systems

Contact Information:

• Website: www.transalis.com
• E-mail: sales@transalis.com
• Address: Portsmouth Technopole, Kingston Crescent, Portsmouth, PO2 8FA, UK
• Phone: 0845 123 3746

 

13. Openbridge

Openbridge takes a data-centric approach to Amazon SP-API integration. Rather than building tools for direct interaction, they focus on unifying Amazon data into private cloud destinations like Redshift, BigQuery, or Snowflake. This allows Amazon sellers and vendors to feed sales, inventory, advertising, and fulfillment data into analytics platforms such as Tableau or Power BI, without manual file exports or scripting.

Their SP-API support includes a wide set of endpoints across Seller Central, Vendor Central, and Amazon Ads. They also provide tools for managing restricted data access and handling PII securely. The end result is a hands-off, code-free data pipeline that gives clients the freedom to build dashboards, reports, or automations using their own analytics stack.

Key Highlights:

• Code-free SP-API data pipelines for analytics use cases
• Supports Seller Central, Vendor Central, and Ads data
• Integrates with all major cloud data platforms
• Approved for restricted token and PII data access
• Listed in the Amazon Selling Partner Appstore

Services:

• SP-API pipelines for orders, inventory, fulfillment, and returns
• Real-time analytics data integration
• Secure data routing to Redshift, BigQuery, Snowflake, etc.
• Amazon Ads and Marketing Stream API automation
• Catalog and Pricing API support for retail analytics workflows

Contact Information:

• Website: www.openbridge.com
• Email: support@openbridge
• Twitter: x.com/openbridgeinc
• LinkedIn: www.linkedin.com/company/openbridge-com

 

14. Vision Infotech

Vision Infotech provides custom Amazon SP-API integration services focused on streamlining and automating how sellers and vendors manage their Amazon operations. Their approach is grounded in practicality, tailoring each integration to meet the client’s specific needs, whether that means migrating from older systems like MWS or implementing a new setup from scratch. They support private seller and vendor apps, public apps listed in Amazon’s Appstore, and a range of backend use cases from inventory sync to refund automation.

Their process typically includes an initial consultation, strategy development, testing in a sandbox environment, deployment, and ongoing support. They also offer documentation and training to help internal teams use the new setup effectively. 

Key Highlights:

• Custom-built Amazon SP-API solutions for sellers and vendors
• Handles both private/internal and public Amazon apps
• Offers secure API access, testing, and validation
• Supports performance tracking, pricing automation, and refunds
• Certified in AWS architecture and experienced across industries

Services:

• SP-API integration strategy and development
• Migration from Amazon MWS
• Inventory and order management automation
• Reporting, analytics, and listing management apps
• Supply chain, returns, and performance monitoring tools
• Training, documentation, and ongoing tech support

Contact Information:

• Website: visioninfotech.net
• E-mail: sales@visioninfotech.net
• Facebook: www.facebook.com/p/Vision-InfoTech-100064033542849
• Twitter: x.com/vision395006
• LinkedIn: www.linkedin.com/company/vision-infotech---india
• Instagram: www.instagram.com/viztechsoftsolutions
• Address: Surat 3001, 3rd Floor APMC, Krushi Bazaar, Beside North Extension, Sahara Darwaja, Surat, Gujarat 395002
• Phone: +91 9328466137

 

15. Deltologic

Deltologic focuses on helping sellers migrate from Amazon MWS to SP-API, a switch that’s now essential since Amazon fully deprecated MWS. Their team works closely with clients to not just replicate old features, but to improve them – optimizing code, improving performance, and in some cases, building entirely new functionalities on top of the upgraded API layer. 

What makes their approach a bit different is the combination of technical migration and optional product evolution. They treat each case individually, reviewing legacy logic, simplifying workflows, and offering expansion options like new integrations or reporting layers. Their support includes creating updated technical documentation and offering long-term maintenance after deployment. For businesses that relied heavily on MWS and now face a mandatory upgrade, Deltologic provides a path forward without breaking what’s already working.

Key Highlights:

• Specializes in MWS to SP-API migration
• Adds improvements during the migration process
• Optimizes app logic and reduces technical debt
• Tailored support for private app developers
• Offers consulting and tech documentation services

Services:

• SP-API migration planning and execution
• Code analysis and optimization
• Feature expansion during transition
• Documentation updates and long-term support
• Security upgrades aligned with SP-API standards
• Custom integration of additional APIs during migration

Contact Information:

• Website: www.deltologic.com
• E-mail: contact@deltologic.com
• LinkedIn: www.linkedin.com/company/deltologic-software
• Instagram: www.instagram.com/deltologic
• Address: Murawa Office Park (HQ), Murawa 12/18, 61-655 Poznań, Poland
• Phone: +48 532 761 520

Wrapping Up

SP-API integration isn’t just about plugging into Amazon’s systems – it’s about building something that fits how your business actually runs. Whether you're a seller trying to automate inventory updates or a developer migrating legacy MWS logic into something cleaner and more future-proof, the right team can make or break that process.

The companies we’ve looked at each bring a different flavor to the table. Some focus on tailored workflows, others on stability at scale, and a few take pride in quietly cleaning up years of patchwork code. Whatever route you choose, the important part is making sure the tech gets out of your way and helps you operate better – not just check a box marked “integrated.” If it makes your day-to-day smoother, more predictable, or less chaotic, you’re doing it right.