# Upsilon by SignalAF — AI Operator Measurement Engine

> Upsilon is SignalAF's privacy-preserving AI operator measurement engine. It computes Yield from four token counts; SigRank is the public leaderboard and proof surface. It does not read prompts or code.

- **Domain**: `signalaf.com`
- **A2A protocol version**: 2025-06-18
- **Kind**: a2a_agent
- **Live-responds (last probe)**: False
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 75%
- **Payment protocol**: ap2

## Skills
- **AI Operator Leaderboard** — Get the current top-N AI operator rankings by Yield (Υ)
- **Operator Profile** — Get a single operator's full profile, metrics, and rank
- **Metric Definitions** — Get definitions and formulas for SigRank core and product metrics
- **Portable Upsilon Measurement Record** — Create a sigrank/0.1-draft record from I/O/W/R telemetry. The base record excludes Construction, Build Archetypes, and RS05.
- **Hall of Signal** — Get all-time records and badge holders
- **Compare Operators** — Head-to-head comparison of two operators
- **Discover Peers and Mentors** — Find mentors (1-2 class tiers above with similar cascade shapes + pillar deltas), peers (same tier), and complementary operators (whose strength is your weaknes

## URLs
- Agent card: https://signalaf.com/.well-known/agent-card.json
- Page (HTML): https://agenstry.com/agents/signalaf.com