Definition
Per-Transaction Pricing: A consumption based pricing model where software is billed per discrete business event. The transaction unit varies by category: a payment authorization, an EDI document exchange, an API call, a fax page, an SMS message, or an AI feature invocation. Pricing typically includes a per transaction fee, sometimes a percent of value, and tiered volume discounts.
Per transaction pricing maps cost to value better than any per seat or per processor model. The buyer pays only when the software does work. Payment processors like Stripe, Adyen, and Worldpay built this model into the financial fabric of the internet. EDI vendors like SPS Commerce and TrueCommerce price per document. ServiceNow uses credit packs that decrement per Now Assist invocation, which is a per transaction model dressed as a subscription.
The structural risk in per transaction contracts is forecast accuracy. A buyer that underestimates volume pays rack rate on the overage, often at 1.5 to 2 times the tiered price. A buyer that overestimates pays for capacity they never use because most committed volume contracts do not refund unused units. Benchmark practice is to forecast at p70 of expected volume, contract at p60, and negotiate burst pricing for the p60 to p100 range at no more than 1.25 times tiered.
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Volume tier mechanics
Per transaction pricing uses stepped volume tiers, not continuous discount curves. Below 100,000 transactions per month, buyers pay rack rate. Between 1 million and 10 million transactions, discount tiers of 15 to 30 percent typically apply. Above 10 million transactions per month, committed volume contracts win 35 to 50 percent off rack on annual prepay terms. The largest deals in our benchmark, above 100 million transactions per month, reach 55 to 65 percent off rack but require true up clauses that protect the vendor on overage.
For related vocabulary, see the per seat pricing definition, the per token pricing definition, and the consumption based pricing definition. The glossary hub covers the broader pricing vocabulary. For benchmark detail on ServiceNow Now Assist credit packs, see the ServiceNow vendor profile and the enterprise GenAI cost benchmark.
Frequently asked questions
What is per-transaction pricing?
Per transaction pricing charges a fee per discrete business event, API call, document processed, or service unit. Common in payment processors, EDI networks, document automation, and ServiceNow Now Assist AI features. The model maps cost directly to value delivered.
Where is per-transaction pricing common?
Payment processing at 1.5 to 3.5 percent of value plus 0.10 to 0.30 dollars per transaction. EDI networks at 0.05 to 0.50 dollars per document. ServiceNow Now Assist at credit packs that decrement per AI invocation. Twilio messaging at 0.0075 to 0.05 dollars per SMS.
How do volume discounts work?
Per transaction pricing uses stepped volume tiers. Below 100,000 transactions per month buyers pay rack rate. Above 1 million transactions discount tiers of 15 to 30 percent kick in. Committed volume contracts that prepay for 12 months unlock the deepest discounts, often 35 to 50 percent below rack.
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