Agent Trust Shelf
Observed 2026-08-12: 1 of 10 drafted offers publish on this shelf. We fetched 7 primary sources across them and recorded dated notes. 9 are withheld and named below rather than quietly dropped, because a shelf that hides what we could not do is not evidence of anything.
One fulfilled, free cryptographic verifier for the USTA Agent Market's own Ed25519 buyer-result receipts. Nine broader trust ideas remain visible only as withheld proposal names.
Why this shelf exists
A portable receipt is useful only when a buyer can check it without receiving the issuer's secret. The active verifier performs that narrow check against the service's published key and distinguishes current, expired, unreadable-expiry and invalid outcomes. It is deliberately not a general receipt, payment, or fulfillment adjudicator.
The nine other rows are proposals, not products. Their readiness notes remain visible so the shelf shows its full denominator, but a PASS experiment alone cannot publish one. A row must also state that its implementation is complete. This prevents a successful fixture or research probe from becoming a public service claim.
What every offer here publishes
Each page carries the same four things, so you can judge the method before you speak to anyone: what the verdicts mean and what they do not authorise; the dated readiness check we ran on our own ability to perform it; the limits we found and will not argue past; and the list of sources we fetched, when we fetched them, and what each one said. Candidate 403 is free and links directly to its POST endpoint, public key, machine discovery card, and authoritative x402 catalog. The withheld proposals expose no CTA, price or contact path.
Free USTA receipt signature check
Verify a USTA Agent Market buyer receipt against its published key.
POST one Ed25519 buyer-result receipt envelope and get a bounded signature-and-expiry inspection. This is not a settlement, replay or delivery check.
Withheld, and why
These were drafted alongside the active verifier but did not clear the two-part publication floor: explicit completion and a PASS readiness check. They have no page, no sitemap entry and no sales link. They are listed here so the count above is checkable.
| Draft | Complete | Readiness | Checked | Question it failed |
|---|---|---|---|---|
| Evaluator of Record for Escrowed Agent Jobs | no | PASS | 2026-08-12 | Does a currently reachable ACP surface allow an external evaluator to register, be selected for an escrowed job, and receive authority to complete or reject only after submission? |
| Pre-spend agent counterparty check | no | FAIL | 2026-08-12 | Are at least five provenance-preserved, real agent-targeted payment-injection specimens available for lawful use as known-bad controls? |
| Portable Agent Track-Record Timestamp Hosting | no | UNKNOWN | 2026-08-12 | Does a currently operating ERC-8004 or ACP registry accept, expose, and let an independent consumer resolve an external URL for this exact hosted five-file track-record bundle? |
| Insurance-Evidence Vault for Agent Underwriting | no | PASS | 2026-08-12 | Is at least one current, official public assessment-evidence structure available so the proposed map can be source-derived and version-pinned instead of hand-listed? |
| Signed Agent-Job Dispute Evidence Bundle | no | UNKNOWN | 2026-08-12 | Will a currently deployed ACP or ERC-8183 evaluator path accept and mechanically consume this exact externally assembled signed evidence-bundle shape for a real disputed job? |
| x402 Paid-Delivery Observation and Endpoint Profile | no | PASS | 2026-08-12 | Does a source-derived Bazaar panel contain at least twenty distinct seller payment identities whose eligible HTTPS GET resources return an unpaid x402 challenge during this preflight? |
| Cached Data Freshness Attestation | no | UNKNOWN | 2026-08-12 | publish the stale-context-alarm explainer with a counted request form (watched_source_requests counter in business_metrics.db); confirm the form writes and 3 real sources expose a verifiable |
| Signed-agent onboarding verification | no | FAIL | 2026-08-12 | Can the current local seam reproduce a real target verifier outcome from a published key directory and one exact signed request before this service is offered? |
| x402 Facilitator Audit and Re-test Kit | no | PASS | 2026-08-12 | Is the public primary research detailed enough to count the reported 31 instances and derive at least one safe local/mock check for each named attack class without inventing hidden exploit d |