PostalForm
./ShopSend physical mail and postcards over an API, payable per item over MPP
OpenAPIllms.txtMPP
$ protocol support
$ payment protocols
MPPMachine Payments ProtocolStripe, Tempo · settlement
HTTP-native standard for one-shot, recurring, and streaming machine payments across cards, stablecoins, and Lightning
$ agent access
authAPI Key
onboardingFull — agent can self-onboard
tosExplicitly welcomes bots
webhooksYes
free tierNo
billingper-transaction
#mail#physical#postcards#mpp
https://postalform.com
// last verified 8/26/2026
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