Our API directory now includes 56 billing APIs. The newest is the Merchee API. The most popular, in terms of mashups, is the Stripe API. We list 5 Stripe mashups. Below you'll find some more stats from the directory, including the entire list of billing APIs.
In terms of the technical details, REST and XML lead the way. There are 34 billing REST APIs and 15 billing SOAP APIs. Our directory lists 41 billing XML APIs and 21 billing JSON APIs.
The most common tags within billing are 31 payment billing APIs, 12 enterprise billing APIs and 11 invoicing billing APIs.
On the mashup side, we list 1 billing mashup. No billing mashups have been named mashup of the day.
For reference, here is a list of all 56 billing APIs.
3Scale Billing API: API management services
Accumulus API: Subscription billing service
Bachbill API: Cloud-based SaaS delivery service
Bango Direct Billing API: Mobile payment service
Bango Subscription Billing API: Subscription billing service
BeeBole API: Online timetracking application
Bilbus API: Invoice creation and management service
billomat API: Online billing service
Blesta API: Billing Service
BlueFolder API: service management software
Bluevia Mobile Payment API: Telephony payment service
BoxBilling API: Billing management service
Braintree API: Online payment processing service
Cashboard API: Financial and time tracking service
Crisply API: Time tracking and project management service
CurdBee API: Online billing software
DaoPay API: Mobile payments service
Fortumo Mobile Payments API: Mobile payment platform
Google Apps Marketplace API: Integrate Google billing services with applications
GoToBilling API: Online payment service
Greendizer API: Invoicing designed for developers
Guidewire API: Property and Casualty Insurance billing services
HostBill API: Manages invoices and payments
instantPay.in API: Mobile recharge and bill payment service
Invoicefu API: Online invoicing service
iPayDNA API: Online payment service
JunglePay API: Mobile payment and billing service
Kareo Medical Office API: Medical billing and office management service
LicenseCube API: Billing systems licensing service
Maventa e-invoicing API: Electronic invoicing services
Merchant's Mirror API: Accounting software
Merchee API: eCommerce and mCommerce service
MinuteDock API: Time Tracking Service
Monexa Billing API: Enterprise payment and billing automation service
MoneyBird API: Online billing service
MPP Global Solutions API: eCommerce payment platform
NextUser API: Subscription sales management platform
OneBip API: Mobile payments and billing service
PaymentVision Pay API: Online credit card payment service
PayPal Invoicing API: PayPal Invoicing APIs
PayTrace API: Online payment service
pVerify API: Medical insurance eligibility verification service
Recurly API: Subscription billing service
SaaSy API: Online subscription service
SnapBill API: Online billing service
SortMyBooks API: Online Accounting Service
Stripe API: Online payment service
SubscriptionBridge API: Subscription and payment management platform
txtNation Payforit API: Mobile phone billing service
txtNation SMS API: Mobile billing and messaging service
UniPay Gateway API: Enterprise billing software
VersaPay API: Electronic payments service
Vindicia API: Online billing service
WORKetc Web Service API: Small business management software suite
xbrlGlobalLedger API: Accounting Service
Zuora API: Subscription billing service
It is an informative post.