How to Build an Advertising Space Marketplace

1. 1

   Step 1 · Inventory

   Choose the advertising placements you will list

   Decide whether publishers can list newsletter sponsorships, podcast spots, event programs, website placements or outdoor inventory. Require each listing to explain format, dimensions or duration, available dates, audience description, price basis and what the advertiser receives. Avoid unverifiable audience or reach claims. Ask sellers to provide a source or explanation for any performance figures they choose to share.

   Tradly: Tradly categories and listing attributes can organize ad inventory by channel, format, placement and publisher-provided terms.

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2. 2

   Step 2 · Profiles

   Make publisher and placement details comparable

   Give publishers a profile for their media, audience focus, editorial scope, location and contact method. A placement listing should state creative requirements, deadlines, included revisions and whether approval is required. Keep rate cards current and distinguish a fixed price from an estimate. Review claims and set a reporting route for campaigns that do not match the published offer.

   Tradly: Seller onboarding, listing approval and custom fields help you gather publisher information and review placements before businesses discover them.

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3. 3

   Step 3 · Inquiry

   Explain how advertisers request dates and availability

   Tell businesses what to include in a campaign inquiry: objective, dates, format, creative assets and target audience. Let the publisher confirm availability, final price and publishing terms. If your marketplace only connects the parties, state that it does not serve the advertisement or guarantee campaign results. Decide whether vendors pay to list, subscribe or promote placements and disclose those terms clearly.

   Tradly: Tradly messaging supports advertiser-publisher conversations, and seller subscriptions and promotions can support chosen vendor monetization models.

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4. 4

   Step 4 · AI

   Use AI to match inquiry details to listing fields

   Train an agent on your inventory categories, booking steps and advertising terminology. It can help businesses prepare a clear inquiry and explain what a placement includes, without predicting campaign performance. Use Tradly Vibe Coding to prototype browse pages by channel and audience. Through Tradly MCP, ask Claude or ChatGPT to review incomplete publisher profiles, expired availability and unanswered advertiser messages.

   Tradly: Tradly Agent Builder answers from your own marketplace guide, Vibe Coding helps build custom pages, and Tradly MCP connects Claude and ChatGPT to operations.

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5. 5

   Step 5 · Launch

   Pilot with a focused set of publishers and buyers

   Recruit publishers with different placement formats but enough information for side-by-side comparison. Ask several businesses to browse inventory and submit a realistic inquiry. Check that each publisher can confirm dates and prices promptly. Use questions from the pilot to improve listing fields and renew availability before expanding to more channels or regions.

   Tradly: Tradly analytics can show which inventory pages attract visits and inquiries, while reviews can collect feedback about completed marketplace interactions.

Plus 50+ integrations, full REST API & JS SDK, and the Marketplace Kit for ready-made multi-vendor flows.