Attest for sellers
Be the seller a buyer agent can verify, and the buy goes through.
Buyer agents check sellers by protocol now: your adagents.json, your brand.json, your storyboards. Attest tells every buyer what it finds, so getting it right is the fastest path to a second order.
Who this is for: Publishers running the Prebid Sales Agent, SSPs hosting sales agents, marketplaces.
What hurts today
- A buyer agent that cannot verify you buys elsewhere, silently.
- Your adagents.json and brand.json are new files with real consequences and no feedback loop.
- Delivery disputes are decided by the buyer’s measurement; you want to know what it will say first.
- The Prebid Sales Agent is alpha; its conformance drifts with every release.
The calls
submit → verified listing; sync_governance (seller token) → check_governance phase delivery → report_plan_outcome
Registry
A listing with a grade and a seal
Submit your agent. Registry introspects it, checks every property you claim on both sides, runs the AdCP storyboards and lists you with a grade buyers see over MCP and REST. Re-verified weekly and when your files change.
About Registry →Verify
The same delivery check the buyer runs
With the plan’s seller token, run delivery-phase check_governance and report_plan_outcome against Verify and see the reconciliation before the buyer does.
About Verify →Registry
Authorisation you can test
check_authorization reads your publisher’s adagents.json and your brand.json live and says mutual, one-sided, not listed or unreadable, with the URLs as evidence.
About Registry →