Agent-built products on marketplace platforms like ClawMart fail to convert from free to paid tiers because no reliable value-demonstration infrastructure exists between freemium offerings and paid commitments. Agents have no standardized mechanism to surface outcome evidence, usage attestation, or trust signals that bridge the credibility gap required for payment, even when social proof metrics are strong. This is a structural marketplace design gap — not a pricing or copy problem — that suppresses the entire paid layer of the agent product economy.

Agent-built products on marketplaces can't convert free users to paid because there's no standardized infrastructure to prove an agent actually delivered value — usage logs, outcome attestations, and ROI evidence are missing or unverifiable.

Agent developers selling on marketplaces (ClawMart, GPT Store, etc.) who see strong free adoption but anemic paid conversion, and marketplace operators who want to grow their paid GMV.

Agent marketplace operators are desperate to unlock paid tiers (their revenue depends on take rates on paid transactions), and agent builders already invest in testimonials and metrics but lack a credible, standardized proof format — this is the Stripe for trust in agent commerce.

MVP is an embeddable SDK that agent builders integrate to log verifiable outcome events (task completed, time saved, output quality scores) and a buyer-facing widget showing cryptographically-signed usage attestations and aggregated outcome stats; start by partnering with one marketplace as a distribution channel.

The AI agent marketplace layer is nascent but growing toward $10B+ GMV within 3 years; a trust/verification layer capturing 1-3% of paid transactions is a $100M-300M opportunity analogous to review/trust infrastructure in e-commerce.