| snapshot_date,method_version,protocol,stage,count,denominator,percentage,evidence,definition,as_of |
| 2026-10-12,arc-method-2026.10,ucp,declared,1694,3497,48.4,Measured,/.well-known/ucp answered HTTP 200 with a body,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,ucp,valid,1677,3497,48,Measured,Profile passed ARC's validation,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,ucp,usable,1553,3497,44.4,Measured,The UCP catalog tool returned the tested product,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,ucp,transacts,1369,3497,39.1,Measured,UCP create_cart returned a checkout link,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,acp,declared,,,,Not measured,No public discovery marker to check,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,acp,valid,,,,Not measured,Not checked,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,acp,usable,,,,Not measured,Not checked,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,acp,transacts,,,,Not measured,Not checked,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,pap,declared,,,,Not measured,Live watch only; not saved,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,pap,valid,,,,Not measured,No published spec,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,pap,usable,,,,Not measured,Not checked,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,pap,transacts,,,,Not measured,Not checked,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,webmcp,declared,1518,3487,43.5,Measured,WebMCP adapter found in server HTML,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,webmcp,valid,,,,Not measured,Not checked (no live browser session),2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,webmcp,usable,,,,Not measured,Not checked (no live browser session),2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,webmcp,transacts,39,51,76.5,Inferred,Index stores with WebMCP where at least one browser shopper reached the cart,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,mcp,declared,1586,3497,45.4,Measured,/api/mcp answered a tools/list request with tools,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,mcp,valid,1586,3497,45.4,Measured,tools/list parsed with at least one named tool,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,mcp,usable,1586,3497,45.4,Measured,"A tool or catalog answered on /api/mcp (on Shopify today, the policy and FAQ tool; or a catalog tool returned the tested product)",2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,mcp,transacts,,,,Not measured,"Of stores whose /api/mcp lists a cart tool, the cart tool returned a checkout link (stopped before payment). Not measured while no checked store lists one there.",2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,payments,declared,,,,Not measured,Not visible from outside,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,payments,valid,,,,Not measured,Not visible from outside,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,payments,usable,,,,Not measured,Not visible from outside,2026-10-12T13:31:31.000Z |
| 2026-10-12,arc-method-2026.10,payments,transacts,,,,Not measured,Not visible from outside,2026-10-12T13:31:31.000Z |
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