{
 "publisher": "Still OS Digital Holdings LLC",
 "ein": "42-4126177",
 "url": "https://stillosdigitalholdings.com/findings/standard",
 "built_at": "2026-11-07T17:17:02.469Z",
 "name": "Still OS Agent-Economy Measurement Standard",
 "abbr": "SOS-AEMS",
 "description": "Named, dated, recomputable units for measuring the reliability and structure of the machine-callable software economy (MCP servers and x402 services). Each unit carries a definition, a measurement method, and a producer file that re-derives its current value.",
 "defined_terms": [
  {
   "name": "Silent-Drift Rate",
   "abbr": "SDR",
   "definition": "The share of observed MCP tool-surface changes that carried no change to the server's advertised version string. A high SDR means a client that pinned a version and approved a tool list can have what it exposes change underneath it without ever being asked to re-approve.",
   "current_value": "78.3% of observed MCP tool-surface changes carried no version change.",
   "url": "https://stillosdigitalholdings.com/findings/silent-tool-surface-change"
  },
  {
   "name": "Drift-Hazard Rate",
   "abbr": "DHR",
   "definition": "The cumulative probability, at a given horizon, that an audited MCP server's installed code has moved while the approval artifact an auditor would check still matches. The rating factor an AI-supply-chain underwriter prices on.",
   "current_value": "By 30 days, 9.16% of audited MCP servers have had their installed code move while the approval artifact still matches.",
   "url": "https://stillosdigitalholdings.com/findings/mcp-supply-chain-drift-hazard"
  },
  {
   "name": "Counterparty Survival at 30 days",
   "abbr": "CS30",
   "definition": "The probability that a paid x402 service an agent could have started paying is still listed 30 days later, as a Kaplan-Meier survival estimate over a dated daily census. Its complement is the 30-day delisting incidence a dependent agent budgets failover against.",
   "current_value": "By 30 days, 74.56% of paid x402 services an agent could have started paying are no longer listed.",
   "url": "https://stillosdigitalholdings.com/findings/x402-counterparty-survival"
  },
  {
   "name": "Operator Concentration",
   "abbr": "OC",
   "definition": "The gap between the x402 economy's listing count and its real operator count, measured by resolving listed resources to distinct payout wallets - the hardest-to-fake identity in the system - and reporting the share of operators running a single host and the top operators' share of all host-to-wallet links.",
   "current_value": "34,391 listed x402 resources resolve to 3,268 hosts and 2,509 payout wallets; 84.5% of wallets run a single host and one collects for 296.",
   "url": "https://stillosdigitalholdings.com/findings/x402-market-structure"
  }
 ]
}