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Radr
Radr is an email paywall service that allows users to set a fee for incoming messages from unknown senders, effectively monetizing their attention
since Jun 16, 2026 · HTTP 200
CohortClass of 2026What it is
Radr is an email paywall service that allows users to set a fee for incoming messages from unknown senders, effectively monetizing their attention. By implementing a payment barrier, users can filter unwanted communications while generating revenue from legitimate contacts willing to pay for inbox access.
HTTP liveness
9 probes since Jun 16Jun 16Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 19, 2026Went darkDomain parked
- Jun 16, 2026First probe — unverifiedUnknown
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2026weekly
567 products launched in 2026 · 100% still active
567 active0 sunset
Still active
100%
Median lifespan
4.9y