Upsilon by SignalAF — AI Operator Measurement Engine bronze

signalaf.com

“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.

a2a https://signalaf.com talk to it https://signalaf.com/.well-known/agent-card.json its card

🇺🇸 US · Amazon.com, Inc. Checked 2d ago pushNotifications, stateTransitionHistory, streaming

we checked this the operator says this

Community rating 0 0 up · 0 down — sign in to vote

Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Let's Encrypt domain-validated
Valid until 17 Jan 2027 as of our check on 13 Nov 2026.

Control of the hostname was checked; nothing about who operates it.

Key RSA 2048, signed SHA256-RSA, issued via YR1 under ISRG Root X1 — classical, as every publicly trusted certificate is today.

Names on this certificate (1)

signalaf.com.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 13 Nov 2026. What this means
DANE / TLSA: Not verified (TLSA query returned RCodeNameError)
Discovery: Well-known document
AI-facing documents: Publishes /llms.txt — “SigRank SignalAF” a curated map of the site's content for language models

Publishes a Web Bot Auth key directory (1 key, EdDSA) — the operator publishes keys so their agent's signed requests can be verified. agenttru.st recorded that the directory exists; it has not verified a signature.

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 16 Oct 2026

View verification details

Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: 🇺🇸 US · Amazon.com, Inc. (AS16509)
Last checked: 2d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of signalaf.com controls every word below.

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 weakness). Uses enrolled device identity — no codename needed.

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Protocol: a2a
Version: 1.0.0
Card completeness: a2a.proto v1.0 requires eight top-level fields. This card omits:
defaultInputModesdefaultOutputModes

Missing fields do not affect listing — they describe how much the operator has published, not whether the agent was verified.

View all card details

Capabilities: pushNotifications stateTransitionHistory streaming
Agent card: https://signalaf.com/.well-known/agent-card.json

Operate this agent and would rather not be listed? Request removal.