FinFam Financial Calculators
app.finfam/calculators
Free financial calculators (rent vs buy, mortgage, retirement) plus the FinFam Pulse money digest.
— the operator's own registry description reported
Publisher app.finfam · first seen 2026-08-20 · endpoint https://ff-api.finfam.app/mcp/mcp
Dependency rating derived
warn — alive, no tools · computational ○ · V n/a
Cluster alive-toolless · distinctiveness 0.734 (unusual). Every figure is a percentile or class within the 15,472-server census — see the whole spectrum.
🔏 Signed receipt rr_5ff0136300627a443bae0922 · ed25519 · key rs-rcpt-2026-08 — this rating is tamper-evident; an agent gets the full signature from check_server and can verify it against the published key.
● observed · ◐ derived · ○ reported — the verdict synthesizes Q1–Q4; Q5 is context. Methodology →
History observed
Every probe we made, oldest → newest (3 shown, 2026-08-23 → 2026-09-06). Green answered · amber answered-but-walled · red no useful answer. A gap in our cadence is a gap in coverage, not evidence about the server.
changelog (2 events)
| date | type | what changed |
|---|---|---|
| 2026-08-30 | outcome | ok (was ok_tools) |
| 2026-08-23 | outcome | first probe: ok_tools |
What kind of tools these are derived
Verification only means something relative to a tool's NATURE — an email-sender has no "true answer", a generator has no answer key. Classification evidence: classified from the operator's own registry description — REPORTED, not observed (tools were not visible to the probe). What checking applies to each kind (the full methodology →):
| nature | tools | meaning | what checking applies |
|---|---|---|---|
| computational | 1 | deterministic transforms | self-checkable by re-computation and known-answer tests |
Tools last seen observed
Harness readiness observed
Can an agent's harness pick this tool and call it correctly? Graded on the three things an agent reads — name, description, typed parameters. Band B — usable, with rough edges.
| legibility check | tools passing | ok |
|---|---|---|
| name is clear & specific | 6/6 | ✓ |
| has a description | 6/6 | ✓ |
| description is substantive | 6/6 | ✓ |
| parameters are typed | 6/6 | ✓ |
| parameters are described | 0/6 | 0/6 |
6 of 6 tools graded · 6 with a captured input schema. RS-008, Tier-1 — no domain knowledge, applies to any tool. “Alive” is not the same as “usable”.
Truth checks observed
Not in the Tier-2 trade lane, or not yet checked. Tier-2 re-derives a server's answers against published primary sources — see truth checks.
Protocol conformance observed
Capabilities: experimental prompts resources tools
Drift observed
No confirmed drift on record. Baseline set 2026-09-06; changes appear here after human review.
raw probe records
| probed (UTC) | outcome | http | ms | protocol |
|---|---|---|---|---|
| 2026-09-06T06:11:42Z | ok | 200 | 364 | 2025-06-18 |
| 2026-08-30T06:11:31Z | ok | 200 | 241 | 2025-06-18 |
| 2026-08-23T06:11:24Z | ok_tools | 200 | 239 | 2025-06-18 |
Watch or embed this verdict
Operators: put the live verdict in your README — it updates with every census, links back here, and is a dated observation, never a warranty:
[](https://robinsaige.com/s/app.finfam/calculators)
Depend on it? Subscribe to its change feed — outcome changes and confirmed drift, no account needed. Building on it? The full dossier as JSON — verdict, rating, truth checks, history — stable enough to gate CI on.
Operator of this server? Everything we hold about it is on this page — free, no account, for anyone. Wrong attribution, stale probe, misclassification? Dispute this record →