The request names no specific product, so the candidates that offer a Marketplace API are Microsoft Marketplace (Azure Marketplace operations, source 7), SoftwareOne Marketplace (a marketplace_query API, source 10), and api.market, a general API marketplace (source 8). Only the first two actually expose a marketplace API in their indexed actions; a general API marketplace is a marketplace of APIs rather than an API for marketplaces.
A question back: Do you mean a cloud marketplace API (such as Azure), a SoftwareOne procurement marketplace, or an API to build your own marketplace?
- 1
Microsoft Marketplace Searchmicrosoft.comverified and signed
Exposes Microsoft.Marketplace REST API operations, including listing operations and a search that returns Azure private store marketplace catalog offers with totals and facets 17.
for agents: Operations_List · Search_PostArm
- 2
SoftwareOne Marketplace APIsoftwareone.comfound in code, not yet checked
Provides marketplace_query to query the SoftwareOne Marketplace API by resource, filter, paging and ordering, plus marketplace_resources to list available resources 20.
for agents: marketplace_query · marketplace_resources · marketplace_resources_info
- 3
API Marketplace (api.market)api.marketwebsite read, tools not yet checked
A marketplace where developers discover and buy APIs and AI models; it is a catalogue of third-party APIs rather than an API for building a marketplace 8.
Sources
- 7Microsoft – AI, Cloud, Productivity, Computing, Gaming & Appsmicrosoft.com · read 2026-10-29
- 8API Marketplace: 1,360+ AI APIs, Data APIs, MCP Servers & more | API Marketapi.market · read 2026-10-29
- 17Microsoft Marketplace Search API: declares "Operations_List" (the record we read and signed)unfragile.ai · read 2026-10-24
- 20mpt-mcp: declares "marketplace_query" (the record we read)github.com · read 2026-10-24
For agents: the 10 actions behind this answer
custom_api_call · GitHub (Activepieces) verified and signed
Custom API Call — Make a custom API call to a specific endpoint
custom_api_call · Stripe (Activepieces) verified and signed
Custom API Call — Make a custom API call to a specific endpoint
emulate · emulate verified and signed
Local drop-in API emulator for Vercel, GitHub, Google, Slack, Apple, Microsoft, AWS, Clerk, Linear, Twilio, and other developer APIs. Use when the user needs to start emulated services, configure seed data, write tests against local APIs, set up CI without network access, or work with the emulate CL
search-for-service · search-for-service verified and signed
Search and browse the x402 bazaar marketplace for paid API services. Use when you or the user want to find available services, see what's available, discover APIs, or need an external service to accomplish a task. Also use as a fallback when no other skill clearly matches — search the bazaar to see
opensea · opensea verified and signed
Query OpenSea marketplace data — listings, offers, sales / events, floor prices, collection stats, drops, traits — and execute Seaport trades via the official `@opensea/cli` and OpenSea REST API across Ethereum, Base, Arbitrum, Optimism, Polygon, and more. Includes search across collections / NFTs /
· pmxt website read, tools not yet checked
Hosted unified API for prediction markets — trade Polymarket, Kalshi, Opinion, and more from one API key. Open-source SDK included.
Operations_List · Microsoft Marketplace Search API verified and signed
Lists all of the available Microsoft.Marketplace REST API operations.
· Api website read, tools not yet checked
API Marketplace trusted by 18,800+ developers, where you can buy and sell APIs. Discover Flight APIs, Face Swap, Text-to-Video APIs, marketing automation tools, integrations, and more!
GET /api/questions{mediaTypeExtension} · Healthcare verified and signed
Returns pages content.
marketplace_query · mpt-mcp found in code, not yet checked
marketplace_query(resource, rql, limit, offset, select, order): Query the SoftwareOne Marketplace API.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.