If you're serious about growing your eCommerce business, you can't rely on just one marketplace. Expanding to multiple platforms helps you reach more customers, reduce risks, and boost revenue.
Here’s a quick look at the top 5 marketplaces for U.S. eCommerce sellers in 2025:
- Amazon: The largest marketplace with unmatched reach but fierce competition.
- Walmart Marketplace: A less crowded alternative, ideal for budget-conscious shoppers.
- eBay: A flexible platform for niche items like collectibles and refurbished goods.
- Shopify: Build your own store while integrating with other major platforms.
- TikTok Shop: Perfect for viral, trend-driven products targeting younger audiences.
Each platform has its own audience, fees, and challenges, so choosing the right one depends on your business goals. Need funding to scale? Tools like Onramp Funds offer financing tied to your sales, helping you grow without giving up equity.
Read on for a detailed breakdown of each marketplace’s strengths, fees, and fulfillment options.
The Best Online Marketplace in 2025 - Which One Is Right for You?
1. Amazon Marketplace
Amazon Marketplace is a powerhouse in U.S. eCommerce, offering sellers access to a massive customer base that spans virtually every demographic and income level across the country. With over 200 million paid Prime members worldwide and millions of visitors each month, Amazon provides unmatched reach for businesses aiming to grow their sales and scale their operations[6].
Audience Reach and Demographics
Amazon's customer base is incredibly diverse, encompassing buyers from middle- to upper-income households across nearly all product categories[2][1]. This broad appeal creates significant sales opportunities for sellers catering to a wide range of consumer needs.
Seller Support and Tools
Amazon equips sellers with a comprehensive suite of tools through Seller Central. These include analytics dashboards, inventory management systems, and performance tracking tools[3]. Its advertising platform is another major draw - Amazon Ads generated over $31 billion in revenue in 2022, showcasing its effectiveness in driving sales[3]. Sellers can also leverage pricing automation tools, review monitoring systems, and an extensive library of educational resources. However, as competition grows, many sellers turn to specialized agencies to help navigate the platform and refine their strategies[1].
Fulfillment and Logistics Options
One of Amazon's standout features is Fulfillment by Amazon (FBA), which handles storage, packing, shipping, and customer service. FBA also makes products eligible for Prime shipping, significantly increasing visibility and conversion rates. With over 175 fulfillment centers in the U.S., Amazon supports same-day and next-day delivery for Prime members, a key advantage for sellers. Alternatively, sellers can choose to manage their own logistics through Fulfillment by Merchant (FBM), though FBA is often preferred for scalability and building customer trust[3][1]. These logistics options are a major factor in Amazon's appeal, despite the associated costs and competition.
Fee Structure and Competition Level
Amazon's fee structure and competitive landscape require sellers to be strategic and efficient. Fees include referral fees ranging from 8–15% of the sale price (depending on the product category) and a $39.99 monthly subscription for Professional selling plans[3]. For FBA users, there are additional storage and fulfillment fees based on product size and weight. While these costs are transparent, they can add up quickly, especially for high-volume sellers.
Competition on Amazon is fierce, with over two million active sellers vying for customer attention. New sellers often face challenges in winning the Buy Box and gaining traction without employing competitive pricing, targeted advertising, and well-optimized listings[1][3]. To navigate these challenges, sellers often rely on flexible financing options to manage cash flow and invest in growth.
Onramp Funds offers equity-free financing tailored specifically for Amazon sellers, with repayments tied to sales performance. This revenue-based approach allows sellers to invest in inventory and marketing during peak seasons without the rigid constraints of traditional loans, making it a valuable resource for scaling operations effectively.
2. Walmart Marketplace
Walmart Marketplace gives U.S. eCommerce sellers a fresh alternative to Amazon's crowded ecosystem. With around 150,000 active sellers in 2024 compared to Amazon's massive two million-plus, it offers a less saturated space, making it easier to gain visibility. This is backed by an impressive $75 billion in eCommerce revenue for 2024[3].
Audience Reach and Demographics
Walmart Marketplace stands out as a great way to diversify your sales channels. It connects sellers with millions of budget-conscious shoppers and suburban families who prioritize affordability and convenience. What makes Walmart unique is its omni-channel approach. Online shoppers can take advantage of Walmart's extensive physical store network, including the option for in-store pickup - a feature that sets it apart from purely online platforms.
Seller Support and Tools
Walmart maintains a high standard for its sellers through a thorough approval process, which helps ensure product quality and reduce fraud. Once approved, sellers gain access to the Seller Center dashboard, a user-friendly tool for managing everything from listings and orders to analytics. The platform also integrates smoothly with third-party tools for inventory and order management. Additionally, Walmart Connect, the platform’s advertising solution, offers features like sponsored search ads and display placements, helping sellers boost their product visibility.
Fulfillment and Logistics Options
Walmart provides sellers with flexible fulfillment options that tap into both its digital infrastructure and its vast retail network. Sellers can choose between the Merchant Fulfilled Network or Walmart Fulfillment Services (WFS). WFS takes care of storage, packing, shipping, and customer service. A key advantage of Walmart’s fulfillment system is the in-store pickup integration, allowing customers to shop online and pick up their items in-store. While WFS supports two-day delivery for eligible products, it’s worth noting that its network is still growing and doesn’t yet have the global reach of more established systems.
Fee Structure and Competition Level
Walmart’s fee structure is another big draw for sellers. Referral fees range from 6% to 20% of the sale price, depending on the product category, and there are no monthly subscription fees[3]. Combine this with a lower seller count, and you’ve got an environment where new and mid-sized businesses can find it easier to grow without being buried under millions of competitors.
For businesses looking to scale on Walmart Marketplace, flexible funding options like those from Onramp Funds can be a game-changer. Onramp Funds offers equity-free financing specifically tailored for Walmart sellers, with repayment plans tied to sales performance. This revenue-based funding allows sellers to invest in inventory and marketing during high-demand periods without straining their cash flow.
3. eBay
eBay, home to 19 million active sellers and generating a GMV of about $85 billion in 2024 [3], caters to sellers with both auction-style and fixed-price "Buy It Now" listings, offering flexibility in how items are sold.
Audience Reach and Demographics
eBay attracts a diverse audience, including collectors, bargain seekers, and those searching for vintage or hard-to-find items. Its wide-ranging appeal makes it a go-to marketplace for categories like electronics, collectibles, vintage goods, and refurbished items, offering something for nearly every price point and interest.
Seller Support and Tools
To help sellers succeed, eBay provides tools like Promoted Listings, a well-established reputation system, and buyer protection policies. Additionally, the platform is improving its AI-driven search capabilities to better connect sellers with their target audience.
Fulfillment and Logistics Options
Unlike platforms like Amazon that offer integrated fulfillment solutions, eBay lets sellers manage their own shipping or partner with third-party logistics providers [3]. This hands-on approach gives sellers full control over shipping methods and costs, though it requires more effort and planning on their part.
Fee Structure and Competition Level
eBay's fees include an insertion fee - usually $0.35 per listing after the first 250 free listings each month - and a final value fee ranging from 10% to 12.35% of the total sale amount, including shipping [3]. Sellers can also opt for additional paid features like bold titles or Promoted Listings to boost visibility. While eBay's large seller base highlights its popularity, the platform shines in niche categories such as refurbished electronics, collectibles, and sustainable fashion, where competition tends to be less overwhelming.
Given the platform's fee structure and logistics demands, having flexible funding options can be a game-changer. Revenue-based financing, for instance, allows sellers to invest in inventory during busy seasons without the stress of fixed monthly payments. Companies like Onramp Funds specialize in providing equity-free funding tailored to eCommerce businesses, enabling sellers to scale operations and align repayments with their actual sales performance.
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4. Shopify (with Shopify Marketplace integrations)
Shopify powers an impressive 4.4 million live stores, with a strong presence in the U.S. It connects seamlessly with major platforms like Amazon, Walmart, eBay, and TikTok Shop [4]. Unlike traditional marketplaces, Shopify allows sellers to create their own branded online stores while still benefiting from integrations with these popular platforms.
Audience Reach and Demographics
Shopify’s influence extends far beyond its own platform, thanks to its strategic integrations with major marketplaces. It attracts a wide-ranging audience, including Millennials and Gen Z shoppers who appreciate unique brands and smooth online shopping experiences [4][5]. In the U.S., more than 2 million monthly active users contribute to its reach, whether through direct visits to Shopify-powered stores or through its integrated marketplace channels. These integrations significantly amplify exposure for sellers.
Seller Support and Tools
Shopify provides sellers with a broad ecosystem of over 8,000 apps designed to handle everything from fulfillment and marketing to analytics and marketplace connections [5]. Sellers also benefit from 24/7 customer support, a wealth of educational materials, and an active community forum. The centralized dashboard simplifies operations, enabling merchants to manage listings, inventory, and orders across multiple channels. Built-in analytics tools help sellers optimize their performance [4].
Fulfillment and Logistics Options
For fulfillment, Shopify offers the Shopify Fulfillment Network (SFN), which provides warehousing, packing, and shipping services for U.S.-based sellers [4][5]. This setup allows merchants to maintain more control over their brand experience compared to larger logistics providers. However, while SFN offers flexibility, it may not match the speed or scale of some competitors. Sellers can also integrate with third-party logistics providers or use dropshipping apps, giving them plenty of options to tailor their fulfillment strategy.
Fee Structure and Competition Level
Shopify’s pricing is straightforward and predictable. Monthly plans start at $39, with a processing fee of 2.9% + $0.30 per online sale [4][5]. Unlike traditional marketplaces, Shopify doesn’t charge listing fees, which helps sellers maintain better control over their profit margins. Additional costs, such as app subscriptions (typically $10 to $50 per month) or premium themes, may apply, but the ability to operate an independent branded store offsets these expenses. Success on Shopify often depends on strong branding, effective marketing, and customer acquisition efforts. While integrating with larger marketplaces can bring additional competition, it also opens up new growth opportunities.
For sellers aiming to scale, access to funding can be a game-changer. Onramp Funds offers flexible, equity-free financing solutions tailored to sales performance. This allows businesses to invest in inventory, marketing, or operational improvements while managing cash flow during growth phases.
5. TikTok Shop
TikTok Shop is a fresh social commerce platform that combines shopping with entertainment. With over 100,000 active sellers already on board, it’s quickly becoming a go-to marketplace for reaching younger audiences and sparking viral product trends. By leveraging engaging content, TikTok Shop builds on the success of established e-commerce platforms to drive sales in a unique way. [1]
Audience Reach and Demographics
TikTok Shop taps into TikTok’s massive U.S. audience of over 150 million monthly active users, most of whom are under 35 years old. With users spending more than 90 minutes daily on the app, sellers have an incredible opportunity to gain exposure. This platform is particularly appealing for brands targeting Gen Z and Millennials, as these groups dominate the user base. Plus, TikTok’s algorithm-driven content discovery can help new brands go viral, even if they don’t have a large following yet. [1]
Seller Support and Tools
TikTok Shop equips sellers with a variety of tools to help grow their business. These include integrated dashboards, product listing tools, and algorithm-powered ad options. Through the Creator Marketplace, sellers can collaborate with influencers, run in-feed ads, and host live shopping events to boost engagement. The platform also offers educational resources and dedicated support teams to assist with onboarding and optimizing stores. Additionally, TikTok Ads integration allows sellers to target specific demographics and monitor campaign performance in real time. [1]
Fulfillment and Logistics Options
While TikTok Shop is still developing its logistics infrastructure, most sellers currently handle their own shipping or work with third-party providers. The platform is piloting partnerships with fulfillment services to make shipping and returns easier for U.S. sellers, but it’s not yet as comprehensive as other major marketplaces. Because TikTok Shop thrives on fast-moving, trend-driven products, sellers need to actively manage inventory and shipping to keep up with demand. [1]
Fee Structure and Competition Level
TikTok Shop operates on a commission-based model with fees ranging from 2% to 5%, making it more affordable than many traditional marketplaces. With no monthly fees, it’s accessible to new and small businesses. Competition on the platform is still relatively low, especially in niche categories, but this is expected to grow as more brands recognize its potential. Success on TikTok Shop relies heavily on creating engaging and authentic content that resonates with the audience, rather than just focusing on product listings or search strategies. [1]
For sellers looking to scale their operations, revenue-based financing from Onramp Funds can provide the flexibility to invest in inventory, marketing, and content creation that aligns with their sales goals. [1]
Marketplace Comparison Table
Here's a breakdown of key marketplace differences to help you allocate your time and resources wisely.
| Marketplace | Commission Fees | Key Strengths | Best For | Onramp Funds Compatible |
|---|---|---|---|---|
| Amazon | 8–15% + $39.99/month | Massive reach, FBA fulfillment, Prime integration | Established brands, high-volume sellers | Yes |
| Walmart Marketplace | 6–20% (no monthly fee) | Lower competition, omni-channel fulfillment | Value-focused products, approved sellers only | Yes |
| eBay | 10–12% + insertion fees | Auction flexibility, global reach | Collectibles, used items, unique products | Yes |
| Shopify | $39+/month + 2.9% processing | Complete brand control, customization | Direct-to-consumer brands, niche products | Yes |
| TikTok Shop | 2–5% commission | Social commerce, viral potential | Trendy products, Gen Z/Millennial audience | Yes |
This table highlights each platform's core advantages and operational details, giving you a quick snapshot of what to expect.
Platform Requirements and Competition vary widely. Amazon, with over two million active sellers, offers swift approval but intense competition [1]. Walmart, on the other hand, limits access to approved sellers, creating a less crowded marketplace with about 150,000 active participants [3]. eBay is known for its low entry barriers, while TikTok Shop, which has grown to over 100,000 active sellers, requires account verification before you can start selling [1].
When it comes to Market Dominance, Amazon towers above the rest, generating $362 billion in GMV, plus an additional $692.7 billion through its other domains [2]. Walmart follows with $75 billion in eCommerce revenue, while eBay boasts $85 billion in GMV and 19 million sellers globally [3].
Logistics Approaches also vary. Amazon's FBA service automates fulfillment, while Walmart offers omni-channel pickup options. eBay and TikTok Shop rely on self-fulfillment, giving sellers more control but also more responsibility. Shopify stands out by offering complete flexibility in how you manage your fulfillment strategy.
All five platforms are compatible with Onramp Funds' revenue-based financing. This financing option provides sellers with growth capital, with repayments tied to a percentage of sales rather than fixed monthly payments. This flexible model is particularly useful for scaling your business across multiple platforms or managing seasonal inventory demands.
Choosing the right marketplace depends on your business model and goals. High-volume sellers often succeed on Amazon despite higher fees, while newer brands might find Walmart or TikTok Shop a better starting point due to less competition. Align your funding and growth strategies with the platform that best supports your objectives.
Conclusion
Selecting the right marketplace is a cornerstone of eCommerce success. Each platform offers its own advantages - whether it’s Amazon’s extensive reach, Walmart Marketplace’s omni-channel opportunities, or TikTok Shop’s knack for capturing younger audiences through engaging, viral content[1].
Thriving on these platforms requires tailoring your strategies to match their specific demands. For instance, Amazon success hinges on navigating FBA logistics and standing out in a highly competitive space. Walmart Marketplace offers a less saturated environment but requires approval and alignment with its fulfillment systems. Meanwhile, TikTok Shop rewards sellers who excel at creating content that connects with its vibrant, younger demographic.
But platform choice is only part of the equation. Efficient scaling across multiple marketplaces demands flexible financing. Revenue-based options like Onramp Funds provide a practical solution, offering fast funding - available in as little as 24 hours - and repayments tied to your actual sales performance. This approach allows sellers to act quickly on growth opportunities, whether it’s stocking inventory for Amazon Prime Day, launching a trending product on TikTok, or expanding into Walmart’s ecosystem, all without sacrificing equity or enduring lengthy approval processes.
The eCommerce landscape is evolving at lightning speed, with trends like social commerce and omni-channel integration becoming the norm[1]. Sellers who adapt to these changes, leverage platform-specific tools, and secure the right financial resources will position themselves to capture a significant share of the $362 billion in GMV Amazon generates annually[2], along with the billions circulating through other major platforms.
Ultimately, your marketplace strategy should align with your products, target audience, and operational strengths. Conduct thorough research, start with small-scale tests, and scale strategically with financial tools that support your growth ambitions.
FAQs
What should I look for when selecting the best marketplace for my eCommerce business?
When picking the right marketplace for your eCommerce business, think about factors like how far your audience reach can go, the platform's fees, and how smoothly it integrates with the tools you already use. It's important to choose a platform that matches your target audience and works well with popular eCommerce systems like Amazon, Shopify, BigCommerce, WooCommerce, Squarespace, Walmart Marketplace, or TikTok Shop.
Also, take a close look at the features the marketplace offers for sellers. Things like marketing tools, fulfillment options, and customer support can make a big difference. Selecting a platform that aligns with your business goals can help you grow and streamline your operations effectively.
What’s the best way to handle logistics and fulfillment when selling on multiple eCommerce platforms?
Managing logistics and fulfillment across various eCommerce platforms can feel like a juggling act. But with the right tools and financial resources, you can simplify the process and keep things running smoothly. One way to do this is by leveraging funding solutions that ensure steady cash flow for critical areas like shipping, inventory management, and operational expenses.
Take revenue-based funding, for example. This flexible option allows you to invest in your logistics and fulfillment needs without sacrificing equity in your business. It’s a smart way to scale operations while keeping pace with the unique demands of each platform you sell on. By aligning financing with your sales performance and growth objectives, you can stay competitive and thrive in the ever-evolving eCommerce world.
How can revenue-based financing help me grow my eCommerce business across multiple marketplaces?
Revenue-based financing offers eCommerce businesses a fast and equity-free way to secure funding. This type of financing can help improve cash flow, scale operations, and invest in essentials like inventory or marketing. Unlike traditional loans, repayments are based on a percentage of your sales, making it a flexible option that adjusts to your business's performance.
Onramp Funds focuses on helping sellers thrive on major platforms such as Amazon, Shopify, BigCommerce, WooCommerce, Squarespace, Walmart Marketplace, and TikTok Shop. With repayment plans aligned to your sales and personalized support, it’s a smart solution for expanding across marketplaces while keeping your finances steady.
