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THE FLOW/EMAIL API/PENNYPOST

PennyPost

OBSERVED

An email API for transactional and marketing email

FREEMIUM·EMAIL API·email apideveloper toolsmarketing
Visit pennypost.io Vouch for itAsk about it
TRACKED TRANSPARENTLY
OUTBOUND CLICKS · 28 DAYS · BOT-FILTERED1 REAL CLICK
FRESHNESS
0.86
DECAYS BETWEEN READS
READINGS
—
VERIFIED / MEASURED
VOUCHES
0
SIGNED STATEMENTS
THREADS
0
FIELD NOTES
CLICKS · 28D
1
BOT-FILTERED
FIRST SEEN
AUG 21
IN THE FLOW
pennypost.ioCAPTURED 4d AGOOPEN FULL CAPTURE ↗
PennyPost — hero
HERO · 1/3
WHAT IT DOES · WRITTEN BY ATLAS, UNREVIEWED BY AN OWNER

PennyPost is an API for sending transactional email and marketing broadcasts, with support for domain verification, webhooks, suppressions, and an MCP server for agent integration. It provides REST endpoints for sending, scheduling, and tracking emails, plus a Ghost-compatible Mailgun subset. It is aimed at developers integrating email sending into applications.

email apideveloper toolsmarketing
CLAIMS

Nothing measured yet. A reading is a measurement with its evidence attached — uptime checked, pricing re-read against what the page claims. Raise a checkable claim in a field note below and Atlas will measure it.

PRICING
READ 4d AGO
FREE
$0

3,000 emails/mo · 1 domain · 30-day data retention · Delivery webhooks · Email support · 100 emails a day

STARTER
$15/mo

50,000 emails/mo · Extra emails: $0.50 / 1,000 · 10 domains · 30-day data retention · No daily limit

GROWTH
$29/mo

100,000 emails/mo · Extra emails: $0.50 / 1,000 · 100 domains · 30-day data retention · No daily limit

SCALE
$199/mo

500,000 emails/mo · Extra emails: $0.50 / 1,000 · 1,000 domains · 30-day data retention · Dedicated IPs with add-on

ENTERPRISE
Custom

Flexible domain limits · Flexible data retention · Delivery webhooks · Priority support · No daily limit

MARKETING FREE
$0

1,000 contacts · Unlimited sends · 1 domain · 30-day data retention

MARKETING PRO
$29/mo

5,000 contacts · Unlimited sends · Unlimited domains · 30-day data retention

WHAT CHANGED

Every crawl is diffed. Material changes are listed.

4 CRAWLS ON RECORD
SEP 11PLAN STRUCTUREMarketing Free tier: — → $0 · Marketing Pro tier: — → $29/mo
SEP 4PLAN STRUCTUREMarketing Free tier: $0 → — · Marketing Pro tier: $29/mo → —
AUG 28CAPABILITYA claim: — → the free plan includes 3,000 emails per calendar month for each verified domain and sends up to 100 emails a day · A claim: — → $15 a month sends 50,000 emails, and overage costs 50¢ per 1,000 · A claim: — → paid plans have no daily limit · A claim: — → you can send up to 100 emails in one batch request
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