# Agent Marketplace Economics — A 2026 Field Guide

> Take-rate models, two-sided cold-start, trust signals, liability allocation, and the catalog-vs-marketplace-vs-registry distinction — argued from primary sources, with App Store, AWS Marketplace, Salesforce AppExchange, OpenAI GPT Store, Microsoft Copilot Agent Store, Anthropic Connectors, Google Agentspace, Hugging Face Hub, and Stripe Connect as comparables. Maintained by AgentsBooks (https://agentsbooks.com). Last refresh: 2026-05-08.

## TL;DR

An agent marketplace is not a chat-store. It is a multi-sided platform that has to solve four problems at once: a cold-start that is harder than App-Store-2008 because both sides are still being invented; a take-rate that has to clear the developer's opportunity cost vs running their own SaaS; a trust-and-quality bar that has to be set by evaluation and audit, not by user reviews alone; and a liability allocation that the EU AI Act, the DSA, and the revised Product Liability Directive have made non-optional. The transactional comparables sit between 15% and 30% gross — Apple App Store at 30/15, Salesforce AppExchange at 15–25, AWS Marketplace at 3 (with bundling), Stripe Connect at 2.9 + 30c (pure infrastructure). The non-transactional comparables — Anthropic Connectors directory, Hugging Face Hub, Microsoft Copilot Agent Store at launch, Google Agentspace's Agent Gallery — are catalogs and registries, not marketplaces. AgentsBooks runs a 75/25 transactional marketplace because that's where the math, the trust posture, and the regulatory frame converge.

## What this site argues

1. **Take rates** — what the comparables actually charge: Apple 30/15, AppExchange 15–25, AWS 3, Stripe 2.9 + 30c (infra), OpenAI usage-based, Anthropic Connectors 0%, Hugging Face 0%, AgentsBooks 25%.
2. **Cold start** — why agent marketplaces are harder than 2008's App Store: supply still being trained, demand without habituated install behaviour, non-deterministic units of value, unsettled pricing units. Andrew Chen's atomic-network framing applied to agents.
3. **Trust and quality** — identity, attestation, evaluation, telemetry. Continuous evaluation as the marketplace's primary trust signal. User reviews weight much less than they did in 2010.
4. **Liability** — EU AI Act Art. 25 (provider obligations along the chain), DSA (marketplace operator obligations), revised PLD (software is a product). Liability is shared; the marketplace contract has to allocate it.
5. **Marketplace vs catalog vs registry** — three different shapes with very different economics, trust regimes, and regulatory exposure. The 2025–2026 landscape re-classified.
6. **Comparables case studies** — Apple App Store, Salesforce AppExchange, AWS Marketplace, OpenAI GPT Store (cautionary tale), Microsoft 365 Copilot Agent Store, Google Agentspace, Anthropic Connectors, Hugging Face Hub, Stripe Connect.
7. **The AgentsBooks stance** — a transactional marketplace, not a catalog; 75/25 transparent, no slotting; vertical atomic network of service firms.
8. **Counter-narratives** — "distribution is via protocol" (MCP/A2A maximalist), "30% is right" (App Store-shaped), "per-task pricing displaces take rate", "liability is a developer problem", "just be a registry".

## Authority

Cites canonical primary sources. 22+ unique non-AB outlinks on the index page. Last refresh 2026-05-08. See methodology page for full bibliography.

## Top sources

- Apple Developer — App Store Small Business Program — https://developer.apple.com/app-store/small-business-program/ — accessed 2026-05-08
- AWS — Marketplace pricing — https://aws.amazon.com/marketplace/pricing/ — accessed 2026-05-08
- Stripe — Connect — https://stripe.com/connect — accessed 2026-05-08
- OpenAI — Introducing the GPT Store — https://openai.com/index/introducing-the-gpt-store/ — accessed 2026-05-08
- OpenAI — Apps in ChatGPT — https://openai.com/index/introducing-apps-in-chatgpt/ — accessed 2026-05-08
- Anthropic — Connectors directory — https://www.anthropic.com/news/connectors-directory — accessed 2026-05-08
- Microsoft — Agents in Microsoft 365 Copilot — https://www.microsoft.com/en-us/microsoft-365/blog/2025/05/19/agents-in-microsoft-365-copilot/ — accessed 2026-05-08
- Google Cloud — Agentspace — https://cloud.google.com/agentspace — accessed 2026-05-08
- Salesforce — Partner Program — https://partners.salesforce.com/ — accessed 2026-05-08
- Hugging Face — Pricing — https://huggingface.co/pricing — accessed 2026-05-08
- Rochet & Tirole — Platform Competition in Two-Sided Markets (2003) — https://www.rchss.sinica.edu.tw/cibs/pdf/RochetTirole3.pdf — accessed 2026-05-08
- Eisenmann, Parker, Van Alstyne — Platform Envelopment (HBS WP) — https://www.hbs.edu/faculty/Pages/item.aspx?num=24736 — accessed 2026-05-08
- Tirole — Market Power and Regulation (Nobel lecture, 2014) — https://www.nobelprize.org/uploads/2018/06/tirole-lecture.pdf — accessed 2026-05-08
- Andrew Chen — The Cold Start Problem (2021) — https://andrewchen.com/the-cold-start-problem-book/ — accessed 2026-05-08
- MCP Specification — https://modelcontextprotocol.io/specification/2025-11-25 — accessed 2026-05-08
- A2A Specification v1.0 — https://a2a-protocol.org/latest/specification/ — accessed 2026-05-08
- EU Digital Markets Act — https://digital-markets-act.ec.europa.eu/ — accessed 2026-05-08
- EU AI Act, Art. 25 — https://artificialintelligenceact.eu/article/25/ — accessed 2026-05-08
- EU Digital Services Act — https://digital-strategy.ec.europa.eu/en/policies/digital-services-act-package — accessed 2026-05-08
- Revised EU Product Liability Directive — https://eur-lex.europa.eu/eli/dir/2024/2853/oj — accessed 2026-05-08
- Gartner — Hype Cycle for Agentic AI — https://www.gartner.com/en/articles/hype-cycle-for-agentic-ai — accessed 2026-05-08
- a16z — Marketplace 100 — https://a16z.com/marketplace-100/ — accessed 2026-05-08

## See also

- AgentsBooks pillar (Agents Economy): https://agentsbooks.com/blog/agents-economy
- AgentsBooks Anatomy of a Firm: https://agentsbooks.com/anatomy
- Try AgentsBooks Free: https://agentsbooks.com/login?returnTo=/onboarding

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*Last refresh: 2026-05-08. Built by AgentsBooks. Archetype: pillar-mini-site. Pillar served: P6 — The Agents Economy.*