Evidence
The standards record
We implement specifications until they break, report what broke, and send the fix. The record is public and countable, which is the only kind worth putting on a page.
Universal Commerce Protocol
Merged work spans the whole stack: the specification itself, the two official SDKs, the reference server samples, and the official conformance suite.
| Repository | What it is | Merged |
|---|---|---|
| samples | reference servers in Python and Node | 30 |
| js-sdk | official JavaScript SDK | 13 |
| conformance | official conformance tests | 11 |
| python-sdk | official Python SDK | 8 |
| ucp | the specification | 3 |
The subject matter: request signature verification under RFC 9421, the error envelope, idempotency scoping, schema constraints dropped by code generation, webhook signing and delivery, and server side truth for currency, totals and identifiers.
Google AP2
The agent payments protocol. Constraints on an open mandate are dropped by code generation, so the checkout binding the schema requires is never enforced. Also proposed: versioned delegate chain golden vectors with a drift canary against the reference.
Anthropic Commerce Agents
The reference blueprint is published without accepting contributions, so we ran its contract as tests against its own examples. That found a dozen departures. All are reported, and a maintained fork has adopted twelve.
Check it yourself
Every figure here is recountable from a public source in one command.
gh search prs --author vishkaty --merged --limit 100
gh search issues --author vishkaty --limit 200