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Overview

SendyKit uses a split billing model because humans and agents do not buy the same way.
PathWho it servesCurrent model
Self-hostedOperators running Sendy + SendyKitOne-time license via EDD
SaaSManaged SendyKit customersSubscription billing
Premium agent actionsAgents using higher-cost capabilitiesStripe-native machine payments

Self-hosted

Self-hosted SendyKit is a paid product.
  • perpetual license
  • use forever
  • tiered by included future major upgrades
  • optional metered add-ons like SMTP pool overflow and AI credits
See Self-Hosted Licensing.

SaaS

SaaS is the managed path.
  • SendyKit hosts and operates the stack
  • no separate Sendy license needed
  • subscription pricing
  • same product direction, less operator overhead
See pricing at sendykit.dev/pricing.

Agent payments

For premium actions, SendyKit can require:
X-Stripe-Machine-Payment: <payment-proof-or-intent-ref>
This is the current implementation target for machine-paid actions.
Direct/raw x402 should be treated as historical exploration unless explicitly revived later.