Vastyn
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OnBuy
Integration.

The UK challenger. Your next channel.

OnBuy is the UK's fastest-growing marketplace -- a genuine alternative to Amazon and eBay for British sellers and shoppers. Lower fees, no competition from the marketplace itself, and a rapidly expanding customer base. For UK sellers looking to diversify beyond Amazon dependency, OnBuy makes strategic sense.

Vastyn connects to OnBuy through the official seller API. Orders flow into your unified inbox alongside Amazon, eBay, and your other channels. Inventory syncs in real time -- sell on Amazon, OnBuy updates within minutes. Manage OnBuy Boost campaigns and advertising alongside your other marketplace marketing.

Whether OnBuy is your primary UK channel or one piece of a multi-marketplace strategy -- Vastyn brings it into your operational reality.

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UK Focused
Growing Marketplace
< 2 min Sync
Inventory Sync
OnBuy Boost
Advertising Ready
All Categories
Multi-Category Support
OnBuy

The UK Marketplace Alternative

OnBuy has grown from startup to serious marketplace contender in just a few years. For UK sellers, it offers a compelling alternative to the Amazon/eBay duopoly.

1

No Marketplace Competition

Unlike Amazon, OnBuy doesn't sell its own products. You're never competing against the marketplace itself. Your success is their success -- aligned incentives that benefit sellers.

2

Lower Fees

OnBuy's fee structure is typically more favourable than Amazon or eBay. Lower selling fees mean better margins on the same products. For price-sensitive categories, this can make the difference between profit and loss.

3

Growing Customer Base

OnBuy's customer base is expanding rapidly. Early sellers are building position in a marketplace with less competition than established platforms. The opportunity is now, while the market is still developing.

4

UK Focus

OnBuy is British -- built for UK sellers, serving UK customers. No complexity of international markets if you want to stay focused on domestic sales. Simple, straightforward UK commerce.

OnBuy

Complete Data Flow

1

Orders

  • Automatic order download
  • Complete order details
  • Dispatch confirmation to OnBuy
  • Tracking number transmission
  • Returns visibility
  • Cancellation handling
  • Refund processing
2

Inventory

  • Sub-2-minute sync across all channels
  • Immediate stock reservation at point of order
  • Multi-variant inventory tracking
  • Low stock alerts
  • Out-of-stock automatic updates
  • Buffer stock controls
3

Products & Listings

  • Listing creation and management
  • Price updates
  • Description and title sync
  • Image synchronisation
  • Category mapping
  • Listing status tracking
OnBuy

Visibility When You Need It

OnBuy Boost is OnBuy's promotional tool -- boost your listings to increase visibility in search results and category browsing. Vastyn brings Boost management into your unified dashboard.

1

Boost Campaign Management

Create and manage Boost campaigns from Vastyn. Select products to boost, set budgets, and control your promotional spend alongside your Amazon and eBay advertising.

  • Boost campaign creation
  • Product selection
  • Budget management
  • Campaign scheduling
  • Status control
2

Boost Performance

Track how your Boost campaigns perform. See impressions, clicks, and sales attributed to Boost. Understand your return on promotional spend.

  • Impression tracking
  • Click data
  • Sales attribution
  • Cost tracking
  • ROI analysis
3

Strategic Boosting

Boost strategically -- new product launches, seasonal peaks, clearing excess stock. Coordinate Boost campaigns with your overall marketing calendar.

  • Launch support
  • Seasonal boosting
  • Clearance promotion
  • Coordinated marketing
OnBuy

Reach More Customers

Beyond Boost, OnBuy offers advertising options to increase your visibility. Vastyn integrates with OnBuy's advertising tools.

1

Sponsored Listings

Promote specific products within OnBuy search results. Increase visibility for key items alongside organic listings.

  • Sponsored listing management
  • Product promotion
  • Visibility control
  • Performance tracking
2

Campaign Analytics

Understand your OnBuy advertising performance. Track spend, impressions, clicks, and conversions. Compare with your other channel advertising.

  • Spend tracking
  • Performance metrics
  • Conversion data
  • Cross-channel comparison
3

Budget Control

Set advertising budgets and track spend. Get alerts when approaching limits. Control your marketing investment.

  • Budget setting
  • Spend monitoring
  • Budget alerts
  • Cost control
OnBuy

Sell Everything on OnBuy

OnBuy supports a wide range of categories -- electronics, home & garden, fashion, toys, health & beauty, sports, and more. Vastyn handles multi-category operations seamlessly.

1

Category Mapping

Products in your catalogue map to OnBuy categories. Vastyn handles the mapping -- either automatically based on product attributes or manually for precise control.

  • Automatic category mapping
  • Manual override capability
  • Category-specific attributes
  • Mapping validation
2

Cross-Category Selling

Sell across multiple categories from one account. Vastyn manages inventory and orders regardless of category -- unified operations across your entire OnBuy catalogue.

  • Multi-category support
  • Unified inventory management
  • Category-agnostic order handling
  • Consolidated reporting
OnBuy

Built for OnBuy Sellers

1

Seller Performance

OnBuy tracks seller performance metrics -- dispatch time, cancellation rate, customer feedback. Vastyn helps you monitor these metrics alongside your other marketplace performance.

  • Performance metric tracking
  • Dispatch time monitoring
  • Cancellation rate visibility
  • Feedback tracking
2

Product Conditions

OnBuy supports multiple product conditions -- new, refurbished, used. Vastyn tracks condition-specific inventory, ensuring customers receive what they ordered.

  • Condition-based inventory
  • Per-condition availability
  • Condition matching at fulfilment
  • Multi-condition listings
3

Pricing Rules

Set pricing rules for OnBuy -- match other channels, undercut competition, or maintain specific margins. Vastyn's pricing engine includes OnBuy in your multi-channel strategy.

  • OnBuy-specific pricing
  • Cross-channel price coordination
  • Margin-based rules
  • Competitive positioning
4

Returns Processing

OnBuy returns flow into Vastyn. Process returns, issue refunds, and track return reasons -- unified returns handling across all your channels.

  • Return request visibility
  • Refund processing
  • Return reason tracking
  • Inventory restock
OnBuy

OnBuy in Your UK Mix

For UK sellers, OnBuy complements Amazon and eBay as part of a diversified marketplace strategy. Vastyn makes multi-marketplace selling operationally manageable.

1

Diversification

Don't put all eggs in one basket. Selling across Amazon, eBay, and OnBuy spreads risk. Account issues on one platform don't shut down your entire business.

  • Multi-platform presence
  • Risk distribution
  • Channel redundancy
  • Business continuity
2

Price Differentiation

Lower fees on OnBuy might allow different pricing strategies. Vastyn lets you set channel-specific prices -- compete on Amazon, protect margin on OnBuy, or vice versa.

  • Channel-specific pricing
  • Margin optimisation
  • Strategic positioning
  • Fee-aware pricing
3

Customer Reach

Each marketplace has some unique customers. Selling on OnBuy reaches shoppers who've chosen to avoid Amazon. Expand your addressable market.

  • New customer access
  • Market expansion
  • Audience diversification
  • Incremental sales
Get Connected

Get Started in Minutes

Connect your OnBuy account and start syncing immediately.

1

Add OnBuy Integration

From your Vastyn integrations dashboard, select OnBuy.

2

Enter API Credentials

OnBuy uses API key authentication. Generate your API credentials in OnBuy Seller Centre, then enter them in Vastyn.

3

Configure Sync Settings

Choose what syncs and how -- inventory rules, pricing approach, category mappings.

4

Initial Sync

Once configured, initial sync begins. Orders start downloading. Inventory populates. Listings map. Depending on catalogue size, full sync completes within minutes.

Time to connect: 10-15 minutes

FAQ

Common Questions About OnBuy

Everything you need to know about connecting and using the OnBuy integration.

10-15 minutes. Generate API credentials in OnBuy Seller Centre, enter them in Vastyn, configure your sync settings, and data starts flowing.
When inventory changes -- sale, return, receipt -- Vastyn updates OnBuy within two minutes. Stock is reserved instantly when orders are placed. This works across all your channels -- sell on Amazon, OnBuy updates automatically.
Yes. Manage Boost campaigns from Vastyn -- create campaigns, select products, set budgets, track performance. Boost management alongside your Amazon and eBay advertising.
OnBuy covers most consumer categories -- electronics, home, fashion, health & beauty, toys, sports, and more. Vastyn maps your products to appropriate OnBuy categories automatically or manually.
Yes. OnBuy can have its own pricing independent of your other channels. Set OnBuy-specific prices, or use rules to calculate based on other channel prices or margins.
OnBuy has lower fees and doesn't compete with its own products. The customer base is smaller but growing. Many sellers use OnBuy alongside Amazon rather than instead of it.
Yes. OnBuy returns flow into Vastyn. Process returns, issue refunds, and track return reasons -- same workflow as your other marketplace returns.
Currently, OnBuy primarily serves the UK market. For UK-focused sellers, this simplifies operations -- no international complexity if you want to stay domestic.

Ready to Connect OnBuy?

The UK's fastest-growing marketplace. Boost campaigns managed. Your OnBuy operations unified with Amazon, eBay, and all your channels.

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