01
Event ingest
Post usage as it happens. Idempotent keys, late arrivals, and replay without rewriting history.
Usage events in. Auditable invoices out. Fathom is the operating ledger for metered SaaS — built for people who still read the tape.
[log] collector nominal. 14 meters rated. drift: 0.00%.
In production at
Usage posted. Invoices closed.
Instrument set
Six surfaces. No illustrations. If a number cannot be traced, it does not ship.
Post usage as it happens. Idempotent keys, late arrivals, and replay without rewriting history.
Name the units that matter: seats, tokens, GB-hours. Version a meter without breaking old invoices.
Tiers, commitments, and overage on a single tape. No hidden multipliers in a spreadsheet.
Every line traces back to events. Finance can audit at 2am without asking engineering.
Hard caps and soft warnings from the same source of truth that prints the bill.
When rated usage diverges from posted events, the console flags it in signal red.
marketing / process-01
A numbered walkthrough of the path from raw events to a reliable close.
01
Send usage from your API, warehouse, or a daily file. Keep the original event identifier.
02
Define units, rates, and effective dates. Inspect a sample before a rule touches production.
03
Trace every invoice line back to its events. Export a complete record for finance.
From the floor
“We closed July without a spreadsheet. Every line on the invoice traces to an event. Finance stopped asking engineering for a dump.”
“The tape is boring in the way a cockpit should be. When drift hits signal red, we actually know what to do.”
“I audit at 2am. Fathom does not decorate the numbers. That is the product.”
Rate card
$0
sandbox
For instrumentation before the first invoice.
$249
/ mo
The operating plan. Most ledgers live here.
Custom
on request
Dedicated rating, VPC, and a named operator.
Desk notes
Anything you post to ingest with an idempotency key: a token, a seat-day, a GB-hour. If it can be rated, it is an event.
Close the loop
Sandbox in ten minutes. Floor when the first customer is metered. No chrome. No candy.