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SoldComps VS Mainstack.co

Compare SoldComps VS Mainstack.co and see what are their differences

SoldComps

One API call, up to 240 real eBay sold prices. Real-time transaction data for resellers, flippers, and developers. Try the live demo free.

Rating
0 reviews
Pricing
Freemium $9 / Monthly (Starter Tier. 2000 requests / month)
Alternatives Is it good?
Mainstack.co

Mainstack enables entrepreneurs with commerce and global payment solutions to showcase and get paid for their work and services, grow revenue, and manage customers - all in one place.

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Rating
0 reviews
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OriginDrop
Source premium K-Beauty products, automate your Shopify workflow, and scale your dropshipping business globally. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Base details

Website, pricing, platforms and company facts side by side.

SoldComps
Mainstack.co
Website sold-comps.com mainstack.com
Pricing
Freemium $9 / Monthly (Starter Tier. 2000 requests / month) Official pricing
—
Platforms
REST API Web
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Company Startup from Canada · 1 - 9 employees · 2026 —
Listed in
APIs eCommerce Web Scraping eCommerce Tools eCommerce Analytics Ebay Alerts +3
Payments Recurring Subscription Billing Subscription Management Invoicing Storefront Link In Bio +3

About SoldComps and Mainstack.co

In their own words, as submitted to SaaSHub.

SoldComps
Mainstack.co

SoldComps is an eBay sold-listings API for resellers, flippers, and developers who need real completed-sale data for pricing. A single keyword search returns up to 240 sold listings straight from eBay's completed-sales results — the sold price recorded on each listing, plus shipping, currency,...

Read more about SoldComps

No description of Mainstack.co yet.

Features and specs

What each product offers, as listed by its team.

SoldComps 7 features
Mainstack.co 5 features
  • Sold comps per request
    Up to 240 completed eBay sales per keyword search
  • Response data
    Sold price, shipping, currency, condition, date, seller, item URL
  • eBay marketplaces
    8 regions: US, UK, DE, FR, IT, ES, CA, AU
  • Output & authentication
    Clean JSON from one API-key GET request — no OAuth or XML
  • Data freshness
    Fetched live per request — no cached or stale prices
  • Max Mode (bulk)
    Async auto-paginating sweeps for large pulls, with CSV output
  • Search filters
    Category, price range, condition, and date window
  • All-in-One Platform
    Mainstack combines multiple business tools into a single platform, including link-in-bio pages, digital storefronts, payment processing, and booking — reducing the need for multiple subscriptions and integrations.
  • Easy Storefront & Digital Product Sales
    Users can quickly set up digital storefronts to sell products, services, courses, and digital downloads without needing technical expertise or a separate e-commerce platform.
  • Built-in Payment Processing
    Mainstack offers integrated payment solutions that support multiple currencies and payment methods, making it easy for creators and businesses to receive payments globally.
  • Creator-Focused Design
    The platform is tailored for creators, freelancers, and small businesses, offering tools like customizable link-in-bio pages, portfolio showcases, and booking features that cater specifically to their needs.
  • No-Code Setup
    Mainstack requires no coding knowledge to get started. Users can build professional-looking pages, storefronts, and booking systems using intuitive drag-and-drop or form-based interfaces.

Possible disadvantages

  • Limited Brand Recognition
    Compared to established competitors like Gumroad, Shopify, or Linktree, Mainstack is less well-known, which may cause potential users to hesitate due to concerns about reliability and longevity.
  • Feature Depth May Be Limited
    While Mainstack offers many tools in one place, each individual feature may lack the depth and advanced functionality found in dedicated single-purpose platforms like Calendly for bookings or Shopify for e-commerce.
  • Limited Third-Party Integrations
    Mainstack may not offer as many integrations with popular third-party tools (e.g., email marketing platforms, CRMs, analytics tools) compared to more established competitors.
  • Smaller Community & Support Resources
    As a relatively newer platform, Mainstack has a smaller user community, which means fewer tutorials, forums, and peer-generated resources available for troubleshooting and learning.
  • Scalability Concerns
    While suitable for individual creators and small businesses, Mainstack may not offer the robust infrastructure and advanced features needed by larger businesses or those experiencing rapid growth.

Analysis

An editorial look at what each product does well and who it suits.

SoldComps
Mainstack.co

Overall verdict

  • SoldComps appears to be a useful tool for buyers, sellers, and resellers seeking quick access to sold item comparables, primarily useful for pricing research on platforms like eBay, though users should verify data accuracy and coverage against official marketplace tools before relying on it for major decisions.

Why this product is good

  • Provides sold price data that can help users gauge fair market value for items
  • Can save time compared to manually searching through sold listings
  • May offer a simpler or more streamlined interface than default marketplace search tools
  • Useful for resellers, flippers, and collectors who need quick pricing references

Recommended for

  • Online resellers and flippers researching pricing before listing items
  • Casual sellers wanting a quick sense of an item's resale value
  • Collectors checking historical sale prices for specific items
  • Small business owners sourcing inventory who need to verify profitability

Overall verdict

  • Mainstack is a solid all-in-one platform for creators, freelancers, and digital entrepreneurs in Africa (and beyond) who want to sell digital products, accept payments, and manage their online presence without needing separate tools for each function.

Why this product is good

  • Combines multiple tools (storefront, invoicing, payment links, link-in-bio) into a single dashboard, reducing the need for multiple subscriptions
  • Built with African creators and businesses in mind, supporting local payment methods and currencies which many global platforms lack
  • Simple, user-friendly interface that doesn't require technical or design skills to set up a professional-looking store or page
  • Supports selling digital products, services, and even physical goods with integrated payment collection
  • Offers analytics and customer management features to help creators track sales and grow their audience
  • Relatively low fees compared to piecing together multiple Western-centric SaaS tools that may not support local payments well

Recommended for

  • African creators, coaches, and freelancers looking to monetize digital products or services
  • Solopreneurs who want an easy way to accept payments locally and internationally without complex setup
  • Content creators needing a simple link-in-bio and storefront solution combined
  • Small business owners who want to send invoices and collect payments in one place
  • Individuals just starting out online who don't want to invest in multiple separate platforms (e.g., Shopify + Stripe + Linktree)

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
SoldComps
Mainstack.co
100% 100%
eCommerce
0% 0%
0% 0%
Invoicing
100% 100%
100% 100%
APIs
0% 0%
0% 0%
Link In Bio
100% 100%

Questions & Answers

As answered by people managing SoldComps and Mainstack.co.

What makes your product unique?

SoldComps's answer

SoldComps returns real eBay sold listings — completed sales, not active listings or estimates — from a single API call.

One keyword search returns up to 240 sold items, each as clean JSON with:

  • Sold price, shipping, and currency
  • Condition and sale date
  • Seller info and a direct item URL

Most tools lock this data behind a dashboard or require an approved eBay developer account. SoldComps hands it back as a simple authenticated GET request you can integrate in minutes — across 8 eBay marketplaces.

Why should a person choose your product over its competitors?

SoldComps's answer

It's built API-first for people who want the data, not another dashboard to log into.

No eBay developer account, OAuth flow, or approval process — just an API key and a GET request that returns clean JSON. What you get:

  • Up to 240 completed sales per search, across 8 eBay marketplaces (US, UK, DE, FR, IT, ES, CA, AU)
  • Fetched live, so results are never stale
  • Filters for category, price, condition, and date window

Pricing is per search, not per result — a search that returns 10 items or 240 counts as one request — and there's a free tier with no credit card to start.

How would you describe the primary audience of your product?

SoldComps's answer

SoldComps serves four main audiences:

  • Resellers & flippers — price inventory from real sold comps before buying at thrift stores, estate sales, and storage auctions
  • Developers — build price-comparison tools, repricers, or valuation features on clean eBay sold data instead of scraping it themselves
  • Market researchers — analyze demand, price ranges, and sell-through from completed sales
  • Estate-sale & liquidation operators — price large lots quickly

What's the story behind your product?

SoldComps's answer

SoldComps started from a simple, recurring frustration: eBay is the best source of real sold-price data, but actually getting that data is painful.

eBay's own API heavily restricts access to sold listings and gates it behind an approval process, and pulling comps by hand is slow and doesn't scale.

So SoldComps collapses all of that into one clean API call — pass a keyword, get back up to 240 completed sales as structured JSON — so resellers and developers get the pricing data they need without wrestling eBay's API or scraping it themselves.

Which are the primary technologies used for building your product?

SoldComps's answer

SoldComps is built in TypeScript — a Hono API backed by PostgreSQL, with a React web app. Billing runs on Stripe.

Who are some of the biggest customers of your product?

SoldComps's answer

SoldComps is used across its core audiences rather than a few big-name accounts:

  • Resellers and flippers pricing inventory before they buy
  • Developers adding eBay sold-price data to their apps
  • Market researchers analyzing demand and pricing trends
  • Estate-sale and liquidation pros pricing large lots fast

User comments

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