Buy Marketing API

Name: Buy Marketing API API
Brand: Buy Marketing API
Availability: InStock

✓ Official Vendor SpecE CommerceStorefrontoauth21 EndpointsREST

For Agents

Retrieve best-selling and merchandised eBay products by category for recommendations, deal feeds, and shopping agents. One endpoint, ranked by metric.

Quickstart

Get started with Buy Marketing API in minutes using your preferred integration method.

# Add to your MCP client config (Claude Desktop, Cursor, Windsurf)
{
  "jentic": {
    "url": "https://api.jentic.com/mcp",
    "auth": "oauth"
  }
}

# Then ask your agent:
"find best selling products on eBay in a category"

# → Jentic returns the GET /events tool with parameter schema, agent executes.

Capabilities

What an agent can do with Buy Marketing API API.

Retrieve best-selling eBay products for a given category to populate recommendation widgets

Surface merchandised products with image, title, and price snapshot for price-comparison feeds

Filter merchandised results by aspect (e.g., brand, model) to narrow to a product subset

Drive shopping-agent suggestions with listings eBay actively merchandises rather than search ranking

GET STARTED

Start building with Buy Marketing API API

Explore with Jentic

View OpenAPI Document

The eBay Buy Marketing API surfaces merchandised eBay products by metric — currently best-selling — so applications can recommend products that are actually moving on eBay rather than guessing from search ranking. Each merchandised product entry includes the listing reference, image, and price snapshot, ready for use in price-comparison sites, deal aggregators, and AI shopping agents. The single GET /merchandised_product endpoint accepts a category_id and metric_name and returns a ranked list, making the API simple to integrate as a discovery layer on top of the larger Browse API.

Use Cases

Patterns agents use Buy Marketing API API for, with concrete tasks.

★ Best-seller widget for an affiliate site

Affiliate publishers call /merchandised_product with metric_name=BEST_SELLING and a leaf category_id to pull the top eBay best-sellers for that category, refreshing the widget once per hour. Each entry already includes the EPID, image URL, and current price, so the widget renders without a second Browse API roundtrip.

Call /merchandised_product with category_id=9355 and metric_name=BEST_SELLING and emit the top 10 entries as an HTML widget

Shopping-agent product suggestions

An AI shopping assistant uses Buy Marketing to suggest gifts under a user budget. The agent calls /merchandised_product for the relevant leaf category, filters by aspect_filter (e.g., brand), and returns the ranked list. Because eBay's merchandising signal is based on actual sales velocity, suggestions land closer to what shoppers are buying than raw search ranking.

Get best-selling items in category 11450, filter to brand=Nike, and return the top 5 with title and price

Deal-of-the-day rotation

Deal-aggregator sites use Buy Marketing as a category rotation source — each day a different leaf category's best-sellers headline the homepage. The single endpoint replaces multiple Browse search calls and keeps the rotation aligned with eBay's own merchandising rather than third-party trend signals.

Pick a random leaf category each day, fetch /merchandised_product, and publish the top 20 entries to the homepage

AI agent integration via Jentic

An AI shopping agent queries Jentic with 'find best selling eBay products in a category' and Jentic returns the /merchandised_product operation along with its required parameters (category_id, metric_name). The agent loads the schema, executes the call with an OAuth Application access token issued through Jentic's vault, and returns ranked product cards to the user.

Use Jentic to search 'find best selling eBay products', load /merchandised_product, and execute it for category_id 9355

Key Endpoints

1 endpoints — the ebay buy marketing api surfaces merchandised ebay products by metric — currently best-selling — so applications can recommend products that are actually moving on ebay rather than guessing from search ranking.

METHOD

PATH

DESCRIPTION

GET

/merchandised_product

Get ranked merchandised products for a category and metric (e.g., BEST_SELLING)

GET

/merchandised_product

Get ranked merchandised products for a category and metric (e.g., BEST_SELLING)

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

eBay OAuth 2.0 Application credentials are stored encrypted in the Jentic vault (MAXsystem). Agents receive scoped access tokens for the buy.marketing scope only — the raw client secret never enters the agent's context.

Intent-based discovery

Agents search by intent (e.g., 'find best selling products on eBay') and Jentic returns the /merchandised_product operation with category_id and metric_name parameters, so the agent calls the right endpoint without parsing eBay's developer site.

Time to first call

Direct integration: 1-2 days for OAuth client-credentials flow, app approval, and aspect-filter parsing. Through Jentic: under 30 minutes — search, load schema, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Complementary

eBay Browse API

Browse API returns full item detail; pair with Buy Marketing to expand a best-seller into a buyable item.

Use Buy Marketing to find what's hot in a category, then call Browse /item/{item_id} for full attributes, shipping, and seller info.

Complementary

eBay Item Feed Service

Item Feed Service downloads bulk catalogue files; Buy Marketing surfaces ranked products from the live catalogue.

Use Buy Marketing for a small ranked recommendation list; switch to Item Feed Service when you need the entire category.

Alternative

eBay Sell Recommendation API

Sell Recommendation gives sellers per-listing optimisation tips; Buy Marketing gives buyers ranked products.

Use Sell Recommendation when the agent represents a seller optimising listings. Use Buy Marketing when the agent is recommending products to a shopper.

FAQs

Specific to using Buy Marketing API API through Jentic.

What authentication does the Buy Marketing API use?

The Buy Marketing API uses OAuth 2.0 with the Client_Credentials grant — an Application access token, not a User token. Through Jentic, the OAuth client secret sits in the MAXsystem vault and the agent receives a scoped access token only for the buy.marketing scope.

Can I get best-selling products across all categories at once with the Buy Marketing API?

No. /merchandised_product requires a leaf category_id — you cannot pass a root category and get a global best-seller list. To build a cross-category leaderboard, call the endpoint per leaf category and merge the results client-side.

What are the rate limits for the Buy Marketing API?

Buy Marketing falls under eBay's Buy APIs application-level rate limits, which are issued per partner application rather than published as a fixed public number. The Developer Analytics API exposes the live remaining quota for every Buy resource — query it to see the exact limit attached to your keyset.

How do I retrieve the top-selling products in a category through Jentic?

Search Jentic for 'find best selling eBay products in a category', load the /merchandised_product operation schema, and execute it with a category_id and metric_name=BEST_SELLING. Install with pip install jentic. Sign up at https://app.jentic.com/sign-up.

Is the Buy Marketing API free?

There is no per-call fee for production use, but the API is part of the Buy API family which requires application-level approval through eBay's developer programme. Sandbox access is available immediately on developer.ebay.com.

What metrics are supported by /merchandised_product?

The currently supported metric is BEST_SELLING. eBay reserves the metric_name parameter as an enum so additional merchandising signals can be added without breaking existing clients.