Credits-gated.
Not per-send.
Reserve recipient capacity before you send. Inject email to consume credits only on successful delivery. Void what fails. No surprise overage bills — ever.
The 3-step credit cycle
HOLD — Reserve capacity
You declare recipient count. Credits are held — not yet billed. Billable immediately on hold.
INJECT — Kumo delivers
KumoMTA accepts delivery. Per-message injection via POST /v1/send or SMTP. Each accepted message commits credits.
COMMIT or VOID — Settle
On delivery success: credits are consumed permanently. On hard bounce or suppression: credits are voided and returned to your wallet in real time.
Everything you need to run email at scale
Credits
Realtime wallet ledger
Live wallet balance via Supabase Realtime. Every hold, commit, and void appears instantly. Full transaction history with timestamps.
Credits
Top-up anytime
Admin grant in the panel — no Stripe required by default. Stripe top-up is optional and only activated when STRIPE_* secrets are configured.
Credits
Idempotent operations
Every credit operation is idempotent via an idempotency_key. Duplicate submissions are safely deduplicated — no double billing.
Credits
Matrix M12 bypass control
Stripe-less top-up is gated by the PMH-SEC M12 control. If Stripe is not configured, the matrix row M12 is skipped during compliance verification.
Credits
No overage billing
You can never go negative. Send is rejected at the SMTP layer if your wallet balance is insufficient. No unexpected bills at end of month.
Credits
Per-workspace isolation
Credits are scoped per workspace. Multi-tenant agency mode: each tenant has their own wallet, their own credit pool, zero cross-contamination.
Simple, predictable pricing
All plans include unlimited SMTP connections, DKIM/SPF/DMARC, OmniFBL, and the full panel. No per-feature add-ons.
Starter
Up to 10,000 credits/mo
$49/mo
- ✓ 5 SMTP connections
- ✓ 1 sending domain
- ✓ Community support
- ✓ Shared IP (warmup required)
Growth
Up to 100,000 credits/mo
$299/mo
- ✓ 25 SMTP connections
- ✓ 5 sending domains
- ✓ Dedicated IP included
- ✓ Priority support
Scale
Unlimited credits
$899/mo
- ✓ 100 SMTP connections
- ✓ Unlimited sending domains
- ✓ Custom IP pool
- ✓ Dedicated account manager
Credits RPC contract
POST /v1/panel/credits/hold
Reserve credits for a batch of recipients. Returns a hold ID and the amount reserved.
POST /v1/panel/credits/commit
Commit a hold after successful injection. Credits are permanently consumed.
POST /v1/panel/credits/void
Void a hold — credits returned to wallet. Used for hard bounces, suppression hits, or cancelled sends.
GET /v1/panel/credits/balance
Returns current wallet balance, total held, and total consumed for the billing period.