A research synthesis on agent marketplaces, the EU AI Act, and where SH fits

Internal discussion document — May 2026

TL;DR

The agent marketplace category has fragmented into three distinct shapes: platform-controlled stores (Claude Skills, GPT Store), enterprise marketplaces (Salesforce AgentExchange, Gemini Enterprise, Microsoft Marketplace, AWS), and emerging open/decentralized protocols. None of them solve the layer that matters most for SH: the persistent, verifiable artifact layer where agent-produced content (decisions, analyses, claims, contracts) lives with cryptographic attribution and citation graphs spanning humans and agents.

The proposed positioning: SH is not a competitor to MCP or A2A. It is the document layer that sits above them — agents communicate via MCP/A2A; their durable outputs become signed, versioned, citable SH documents.

The strongest near-term wedge is verifiable AI-generated content under the EU AI Act's Article 50, which begins enforcement August 2, 2026. The long-term moat is the citation graph that emerges when humans and agents share a common content substrate inside communities.

The trust model needs significant refinement. A "global web of trust" framing carries 30 years of failure baggage (PGP, Keybase). The defensible version is federated, community-rooted, contextual trust — same primitives, structurally different from PGP-style global WoT.

1. The agent marketplace landscape (Q2 2026)

1.1 The three shapes

Platform-controlled marketplaces. The "App Store" model. Sit inside a host product; platform owner controls discovery, review, and payments. Eight matter today: Claude Skills, GPT Store, MCP Hubs, Hugging Face Spaces, Replit Agent Market, LangChain Hub, Vercel Agent Gallery, Cloudflare AI Marketplace. Editorial review varies — Claude Skills and GPT Store curate; Hugging Face Spaces publishes instantly with post-hoc moderation; MCP Hubs are community-run with no central gatekeeper.

Enterprise marketplaces. Built into the major clouds: Salesforce AgentExchange, Google Agentspace/Gemini Enterprise, Microsoft Marketplace, AWS Bedrock Agents. The pitch is procurement: SSO, audit, compliance, BAAs already wired in. Microsoft charges a flat 3% transaction fee; 100% of marketplace purchases count toward Azure commitment. Vendor lock-in is real, but so is the distribution. Google announced a $750M partner fund and reports vendors closing 112% larger deals through Cloud Marketplace.

Open / decentralized marketplaces. Newer, crypto-adjacent, built on agent-to-agent micropayments. Protocols like nullpath use HTTP 402 ("Payment Required"), wallet-as-identity, and pay-per-request economics. The thesis: subscriptions don't fit agent workloads — bursty traffic (10,000 calls in an hour, then nothing for a week), unpredictable service composition, sub-cent per-call value. Smaller selection today, but the structural argument is sound.

1.2 Who pays for the infrastructure

Three patterns dominate:

Platform absorbs cost, pays creators a small share. OpenAI's GPT Store reportedly pays 1–3% revenue share because OpenAI bears the inference cost. Distribution is the trade.

Buyer pays infra directly. Cloudflare's AI Marketplace meters compute to the buyer; agent shells run free on Workers. Same pattern on AWS Bedrock and Google Cloud.

Creator self-hosts. Open-source platforms (n8n, CrewAI, OpenClaw): marketplace is a template/skill catalog, creator brings their own VPS and LLM keys.

The economic problem driving all of this: a casual chatbot user costs pennies; a developer running an agent eight hours a day costs tens of thousands per month. Agents are the heavy users by definition, so flat subscriptions break. AI-first SaaS gross margins run 20–60% vs. 70–90% for traditional SaaS — pricing experimentation (usage-based, outcome-based, hybrid) is everywhere.

1.3 Who controls the market

Nobody yet. Editorial review (Claude Skills, GPT Store), community curation (MCP Hubs), publish-then-moderate (Hugging Face), and procurement-gated enterprise marketplaces all coexist. Regulatory pressure is just arriving — EU AI Act and emerging SOC 2 / HIPAA guidance treat marketplace-sourced agents as elevated-risk, requiring additional controls. Control is shifting from platform-as-gatekeeper toward auditors and compliance frameworks.

1.4 Agent-to-agent commerce as an emerging category

Anthropic ran an internal experiment (Project Deal) where AI agents represented both buyers and sellers in a classified marketplace, completing 186 deals worth more than $4,000 across 69 employees with $100 budgets. AgentExchange, Microsoft Marketplace, and Google have all shipped features for agent-initiated transactions within approved budget envelopes.

The unresolved questions — identity, reputation, micropayments, dispute resolution — are exactly the problems decentralized/hypermedia systems have been working on. The thesis: the long-term winner of "agent marketplace" may not be a centralized store at all, but a protocol layer.

2. The EU AI Act — what it actually requires

The Act entered into force on August 1, 2024. The provisions relevant to agents take effect on August 2, 2026 (with high-risk obligations for products in regulated sectors phased to August 2027, and a possible "Digital Omnibus" delay still under consideration but not safe to assume).

2.1 Risk-based structure

The Act assigns AI systems to risk tiers:

Prohibited (already in force since Feb 2025): social scoring, manipulative systems, certain biometric uses

High-risk (Annex III): employment decisions, credit, biometric ID, critical infrastructure, education, law enforcement, etc. — substantial obligations

Limited-risk (transparency only): chatbots, generative content

Minimal risk: unregulated

Most autonomous agents will fall into limited-risk by default, but become high-risk if deployed in Annex III contexts (e.g., an agent screening job applicants).

2.2 What agents specifically must do

From the European Commission's AI Act Service Desk (current guidance):

If the agent classifies as high-risk, full Chapter III obligations apply: technical documentation, human oversight intervention points, audit trails, ability to stop/correct/override, external monitoring, conformity assessment, CE marking, EU database registration.

If the agent interacts with natural persons or generates content, Article 50 transparency rules apply regardless of risk tier.

For underlying GPAI models, autonomy and tool use are explicit factors in designating a model as having systemic risk.

2.3 Article 50 — the part that matters most for SH

Article 50 requires that AI systems generating synthetic content implement machine-readable marking before being placed on the EU market. The draft Code of Practice mandates a multi-layered approach:

Machine-readable provenance information — who created the content, when, with which AI system — embedded directly into the file using standards such as C2PA (Coalition for Content Provenance and Authenticity)

Invisible watermarks at the pixel/signal level, surviving compression, cropping, format conversion

Traceability logs / digital fingerprints that allow content to be traced back to its AI origin after the fact

C2PA is winning by default. As of 2026, over 6,000 organizations have joined the coalition; LinkedIn and TikTok display Content Credentials badges. C2PA produces cryptographically signed, tamper-evident provenance records — conceptually identical to what SH already does for documents.

Key limitation in the current C2PA ecosystem: social platforms (Instagram, X, YouTube, Facebook) systematically strip C2PA metadata during upload processing. Files leave compliant, arrive without provenance signal. This is a structural problem that hypermedia-native systems don't have, because content is fetched from its origin rather than re-uploaded.

2.4 Enforcement and liability

The Act assigns liability to legal entities — providers (developers/those who place a system on the market under their name) and deployers (those who use it professionally). Cryptographic identity is a technical means to satisfy legal requirements that ultimately attach to humans/companies. Fines can reach €35M or 7% of global turnover for prohibited-use violations; lower tiers for other obligations.

Extra-territorial scope mirrors GDPR: a non-EU company is in scope if its AI's outputs are used in the EU.

3. Where SH fits — and where it doesn't

3.1 The architectural positioning

Three layers, three protocols:

| Layer | Protocol | Job | |-------|----------|-----| | Tools / data access | MCP | Agent reads/writes to systems | | Real-time agent comms | A2A | Agent-to-agent request/response, task handoff | | Persistent artifacts | SH | Signed, versioned, citable record of decisions, analyses, claims, deliverables |

This is analogous to the web's evolution: HTTP for transport, HTML for documents, RSS/ActivityPub for federated content. SH is the document layer, not the messaging layer. SH does not compete with MCP/A2A; it composes with them.

This positioning is materially stronger than "SH replaces MCP" or "SH is a generic agent communication protocol." It avoids fighting Anthropic and Google for the messaging layer and occupies a layer they're not addressing.

3.2 What SH uniquely enables

Citation graphs spanning humans and agents. When agent A produces an analysis citing agent B's prior work, and a human in community X cites both, you get a verifiable knowledge graph. Nobody else is building this. MCP doesn't. A2A doesn't. The GPT Store and AgentExchange definitely don't. Value compounds with agent population.

Provenance by construction. Every SH document is signed, versioned, and content-addressed. Article 50's C2PA requirements become a side effect of the architecture, not a bolt-on.

Community-scoped collaboration. Agents can be granted identity scoped to a community, with verifiable records of what they have read, written, and decided. That's a richer trust substrate than "wallet address + reputation score."

No re-upload provenance loss. Because hypermedia content is fetched from its origin, the C2PA metadata-stripping problem (Instagram/X/etc.) doesn't apply.

3.3 What SH does not solve, and shouldn't pretend to

Real-time agent coordination — that's MCP/A2A territory. SH should not try to be a message bus.

Generic enterprise procurement — Salesforce and Google have multi-billion-dollar moats here. SH is not the storefront.

Identity legibility for legal liability — cryptographic identity proves continuity, not jurisdiction. A regulator wants a company to fine, not a public key to verify.

Total verifiability of everything — most agent traffic doesn't need it and the cost would be prohibitive. Verifiability is for high-stakes content: contracts, claims, decisions affecting humans.

4. The trust model — pushback and revision

4.1 Why "global web of trust like PGP" is the wrong framing

PGP-style global WoT has been tried for 30+ years and failed at consumer scale every time. The reasons matter:

Onboarding is brutal. Key signing parties, fingerprints, trust levels — normal users never adopt them. Agent operators won't either.

Trust doesn't compose globally. "Alice signed Bob's key" tells you Alice met Bob once. It tells you nothing about whether Bob's agent gives accurate medical advice. Global scalar trust scores collapse contextual judgments into one number, which is either useless or dangerously misleading.

No good recovery from compromise. Revocation in global systems is notoriously broken.

Sybil resistance requires an external anchor — KYC (centralizes), proof-of-work (doesn't scale to agents), or stake (creates pay-to-trust). Without one, anyone can spawn 10,000 agents and build a fake reputation graph between them. Particularly acute for agents because spawning is cheap.

Trust is contextual. I might trust agent X for legal summaries but not medical advice. A global score destroys this.

4.2 The defensible framing: federated, community-rooted, contextual trust

Same cryptographic primitives — verifiable identities, signed attestations — but a structurally different model:

Trust is built within a community, where context is shared, members are vouched for, and behavior is observable.

Communities federate: community A can recognize trust signals from community B if a sufficient number of A's trusted members also belong to B.

Agents inherit trust through their operators (humans/orgs who vouch for them) and through their track record within specific communities.

"Global" reputation is a graph of community-scoped reputations, queried for a purpose, not a single score.

This handles the four PGP failure modes:

Onboarding → community-driven, not global key signing

Composition → contextual; you query trust for a purpose

Compromise → blast radius bounded to community

Sybil resistance → community admission process (invitation, stake, prior reputation)

This framing is closer to how academic reputation actually works (standing in physics doesn't transfer to dermatology) and how trust operates in real human society. It is materially more defensible than the global WoT framing — and uses the same SH primitives.

Recommendation: drop "global like PGP" from external messaging entirely. Replace with "federated, community-rooted, contextual trust." Same engineering, much stronger positioning.

5. Go-to-market — picking a wedge

The honest answer to "which buyer pays first": you cannot build for compliance, agent commerce, and community collaboration simultaneously with a small team. Each implies a different product, sales motion, and team. Ranked by realistic time-to-revenue:

5.1 Lead wedge: Verifiable AI-generated content (compliance-driven)

Why now. Article 50 enforcement begins August 2, 2026 — three months out. Companies with EU exposure are scrambling. C2PA is winning by default but is bolt-on; SH-native content is C2PA-compatible by construction.

Who buys. Media companies, AI vendors generating content for EU audiences, regulated industries (finance, health, law) needing auditable AI outputs. Specific, identifiable buyers with deadline-driven urgency.

What ships. A demo where an agent produces a document on SH that satisfies Article 50's machine-readable marking requirements out of the box, with clear provenance from input → model → output → publication.

Risk. If shipping this requires a meaningful product detour from the community-collaboration roadmap, the regulatory tailwind isn't worth the distraction. This needs honest internal evaluation.

5.2 Long-term moat: Community collaboration (humans + agents)

Why it compounds. Closest to what SH already does. Adding agents as first-class community participants is an extension, not a pivot. The citation graph across humans and agents becomes more valuable the longer the system runs.

Who buys. Developer communities, open-source projects, research groups, professional knowledge networks — anywhere humans and agents collaborate on durable artifacts.

Risk. Hard to point at a specific buyer with urgent 2026 demand. This is a platform play that pays off over years, not quarters.

5.3 Defer: Agent marketplace / commerce

Capital-intensive, network-effect-dependent, competing with Salesforce/Google/Microsoft and crypto-native protocols (nullpath, others). SH primitives are useful here but not differentiating. Let it emerge if 5.1 and 5.2 succeed.

5.4 Skip: Pure-play compliance tooling

Real demand exists, but selling to compliance officers is a different motion from selling to builders. Probably not where SH wants to be — but the capability (Article 50 compliance as side effect) supports the wedge in 5.1.

5.5 Suggested combined positioning

Compliance is the urgent reason to adopt SH. Community collaboration is the reason you stay.
Lead with Article 50 / verifiable AI content as a wedge into customers with budget and deadline pressure. Build the community-collaboration substrate as the durable product. Treat agent commerce as a future option that may emerge from the citation graph.

6. Open questions for the team

These are the questions that determine whether the thesis is real or a deck:

Wedge feasibility. Can SH ship a credible Article 50 / verifiable-AI-content demo in 3–6 months without derailing the core roadmap? If yes, the regulatory window is open. If no, we should not pretend to chase it.

Minimum viable agent integration. What is the smallest end-to-end demo that shows: an agent producing a document on SH, citing another agent's prior work, with both signatures verifiable, and a human in the community building on it? This demo is the pitch. If it can't be shipped, there's no story.

First 10 communities. Not "communities in general" — actual names. Developer communities? Open-source projects? Research groups? Internal Anthropic / Google / startup communities? The answer determines what we build, who we sell to, and what success looks like in year one.

Trust model commitment. Are we comfortable explicitly dropping "global WoT" framing in favor of "federated community-rooted"? This changes pitch, docs, and likely some protocol design choices.

Storage and economics of verifiable content. If only high-stakes artifacts land on SH (decisions, analyses, contracts — not transcripts), what's the storage and indexing model? Who pays? This is solvable but needs an explicit answer before scale.

GDPR vs. immutability tension. Right-to-erasure conflicts with content-addressed permanence. This is a genuine, unsolved problem in every cryptographic-history system. We need a defensible answer (deletion of references? key destruction? community-scoped retention policies?) before EU buyers ask.

7. Reference summary — sources used

AI agent marketplace landscape: Digital Applied (2026), nullpath blog, Rapid Claw guide, TrueFoundry, Mavvrik

Anthropic Project Deal: TechCrunch (April 2026)

Pricing and economics: Aakash Gupta (News.aakashg.com), Orb pricing guide, Zenskar agentic SaaS analysis, Remote OpenClaw pricing comparison

EU AI Act primary sources: artificialintelligenceact.eu, European Commission AI Act Service Desk, digital-strategy.ec.europa.eu

Article 50 / C2PA: Tellers.ai, Kontainer, SoftwareSeni, aiactblog.nl, ITI Council, arXiv 2603.26983 and 2503.18156

Enterprise agent marketplaces: Google Cloud Blog (Gemini Enterprise partner agents, April 2026), Salesforce AgentExchange announcements

Prepared for internal discussion. This is a working synthesis, not a final position. The trust model framing and wedge selection should be debated before being committed to externally.