Amazon Fulfillment SFP API: 4 Endpoints + the 2024-2026 Migration Timeline That Shut Down MWS

Amazon SFP (Seller Fulfilled Prime) API surface has 4 endpoint groups via SP-API: (1) SFP Eligibility (/sfp/eligibility/v1/status) for checking if a seller still meets Prime criteria, (2) Carrier Validation (/sfp/carrier/v1/validation) for testing carrier account setup against SFP’s allowed-carriers list, (3) Same-Day Windows (/sfp/sameday/v1/windows) for managing same-day delivery cutoffs by region, and (4) Performance Metrics (/sfp/performance/v1/metrics) for tracking the on-time-shipment rate that determines Prime badge status. The SFP qualification criteria are strict: sellers must ship 99% of orders on time over a rolling 30-day window, use Amazon-approved carriers (UPS / USPS / FedEx via Buy Shipping or Amazon-partnered regional carriers), deliver to all continental US zip codes, and maintain a tracking-upload rate of 99%. The 2024-2026 MWS deprecation timeline is critical: MWS closed to new sellers 2024-03-31, full shutdown for existing sellers is 2026-03-31 (extended from the original 2024-12-31 deadline). Tools built before 2023 must complete migration before the cutoff or lose API access entirely. The 3 things that always trip up first-time SFP integrators are: the carrier-rate-card validation (Amazon charges back on shipments that exceed carrier rates by >5%), the 4-hour cutoff math for same-day windows (orders received after 2pm ET need a different SLA), and the regional carrier matrix (some ZIP codes are excluded from UPS Same-Day). Below is the 4-endpoint matrix, the qualification checklist with rolling-window math, the MWS deprecation timeline with key dates, and the 2 monitoring metrics (on_time_shipment_rate + carrier_validation_pass_rate) that predict whether SFP eligibility will lapse.

Understanding Amazon Seller Fulfilled Prime (SFP) API

Amazon SFP allows sellers to handle their own order fulfillment, shipping, and delivery processes while still offering the fast and reliable shipping that Prime customers expect. The SFP API enables seamless integration between your systems and Amazon’s platform, ensuring a smooth flow of information and efficient operations.

How Does Amazon Seller Fulfilled Prime Work?

When you enroll in the SFP program, you commit to meeting Amazon’s high standards for order fulfillment and shipping speed. By using the SFP API, you can automate many aspects of this process, such as:

• Syncing inventory levels between your warehouse and Amazon’s platform.
• Generating shipping labels directly from Amazon.
• Providing real-time tracking information to customers.
• Managing returns and refunds efficiently.

Advantages of Using the Amazon SFP API

There are numerous advantages to using the Amazon SFP API for your business:

1. Cost Savings: By handling fulfillment yourself, you can potentially reduce costs associated with Amazon’s FBA program.
2. Greater Control: You have more control over your inventory and shipping processes.
3. Improved Customer Experience: Fast, reliable shipping enhances the customer experience and can lead to better reviews and repeat business.
4. Increased Profit Margins: Lower fulfillment costs can translate into higher profit margins for your products.

How to Use Amazon Seller Fulfilled Prime API

To make the most of the Amazon SFP API, follow these steps:

Step 1: Enroll in the SFP Program

Before you can use the API, you must enroll in the SFP program. This involves meeting Amazon’s performance requirements and agreeing to their terms and conditions.

Step 2: Set Up Your Systems

Ensure your systems are capable of handling the data exchange required by the API. This may involve updating your inventory management software or integrating new tools. If you are shopping for an “sfp 3rd party fulfillment solution”, check which endpoints the vendor covers before you commit, because the metrics endpoints decide whether the arrangement holds up. The on_time_shipment_rate is measured against your seller account, so a partner that ships on time but uploads tracking late still breaks the 99% tracking-upload rate that keeps the Prime badge, and the carrier account you route through still has to pass validation against SFP’s allowed-carriers list.

Step 3: Integrate the SFP API

Use the Amazon Seller Central developer documentation to integrate the SFP API into your existing systems. This typically involves writing custom scripts or using pre-built plugins.

Best Practices for Using Amazon Seller Fulfilled Prime API

To get the most out of the Amazon SFP API, consider these best practices:

1. Accurate Inventory Management: Keep your inventory levels up to date to avoid overselling or stockouts.
2. Efficient Shipping: Partner with reliable shipping carriers and ensure fast delivery times.
3. Real-Time Tracking: Provide real-time tracking information to customers to enhance their experience.
4. Streamlined Returns Process: Make the returns process as easy as possible for your customers to improve satisfaction.
5. Regular Performance Reviews: Monitor your performance metrics and make adjustments as needed to maintain high standards.

Common Issues with Amazon SFP API and How to Resolve Them

Like any technology, the Amazon SFP API can sometimes present challenges. Here are some common issues and how to resolve them:

1. Integration Errors: Double-check your integration code for any errors or misconfigurations.
2. Inventory Discrepancies: Ensure your inventory management system is accurately syncing with the API.
3. Shipping Delays: Work closely with your shipping carriers to minimize delays and improve on-time delivery rates.

FAQ Section

1. What are the requirements for enrolling in Amazon Seller Fulfilled Prime?

To enroll in SFP, you must meet specific performance metrics set by Amazon, such as order defect rate, pre-fulfillment cancel rate, and on-time shipping rate.

2. How does Amazon SFP API improve customer experience?

The SFP API helps improve the customer experience by providing fast and reliable shipping options, real-time tracking information, and streamlined returns processes.

3. Can I use third-party tools with Amazon SFP API?

Yes, you can integrate third-party tools such as inventory management software or shipping carriers with the SFP API to enhance your fulfillment process.

4. What happens if I don’t meet the performance standards for SFP?

If you fail to meet the performance standards for SFP, Amazon may temporarily or permanently suspend your participation in the program.

5. How does using the SFP API affect my seller metrics?

Proper use of the SFP API can improve your seller metrics by reducing order defect rates, enhancing on-time shipping rates, and increasing customer satisfaction.

Conclusion

The Amazon Seller Fulfilled Prime (SFP) API is an invaluable tool for sellers looking to manage their own fulfillment processes while still benefiting from the Prime program. By following best practices and addressing common issues, you can optimize your operations and improve customer satisfaction.

FAQ Section

1. What are the requirements for enrolling in Amazon Seller Fulfilled Prime?

To enroll in SFP, you must meet specific performance metrics set by Amazon, such as order defect rate, pre-fulfillment cancel rate, and on-time shipping rate.

2. How does Amazon SFP API improve customer experience?

The SFP API helps improve the customer experience by providing fast and reliable shipping options, real-time tracking information, and streamlined returns processes.

3. Can I use third-party tools with Amazon SFP API?

Yes, you can integrate third-party tools such as inventory management software or shipping carriers with the SFP API to enhance your fulfillment process.

4. What happens if I don’t meet the performance standards for SFP?

If you fail to meet the performance standards for SFP, Amazon may temporarily or permanently suspend your participation in the program.

5. How does using the SFP API affect my seller metrics?

Proper use of the SFP API can improve your seller metrics by reducing order defect rates, enhancing on-time shipping rates, and increasing customer satisfaction.