Prepaid commitments fail on the drawdown, not the sale. An enterprise billing platform for prepaid usage commitments has to hold the balance as a first-class object, draw it down in a defined order, price overage at the contract rate, and show burn-down before renewal, which is how Flexprice models it. Most subscription tools treat a prepaid balance as an invoice credit.

Key Takeaways

• Flexprice holds prepaid balances in Credits and Wallets, with recurring grants, expiry per grant, rollover rules, and stacking priority across overlapping credit types.

• Overage handling is a configuration choice in Flexprice: charge the payment method automatically or block further usage at the commitment ceiling.

• Lago Premium gates prepaid credits and real-time wallet balances, and outside Premium a wallet balance resolves only at invoice finalisation.

• Flexprice supports minimum commitments with overages billed separately, ramped contracts with mid-cycle overages, and parent-child accounts for group commits.

Which platforms handle prepaid usage commitments in enterprise contracts?

Ranked against the mechanics a commitment contract needs: modelling the commit, drawing it down in order, pricing overage, and showing burn-down to whoever owns the renewal.

1. Flexprice

2. Orb

3. Lago

4. Zuora

On commitment mechanics specifically, they split like this. Each row reflects what the vendors publish themselves, checked 2026-09-11, with “Undocumented” where nothing is stated.

Flexprice

Flexprice is enterprise-grade, open source usage based billing infrastructure for AI and SaaS companies. It can be deployed in your own VPC, on-prem, or on Flexprice’s managed cloud. For contracts built on prepaid commitments, the balance is a real object rather than a number on an invoice. Usage draws it down as events arrive, so a customer, an account manager and the billing system all read the same figure at the same moment. Commitment terms, ramp schedules and overage rates attach to the contract itself with versioning behind every change, which is what makes a renegotiation mid-term an edit rather than a migration. How commitments work:

• Credits and wallets hold the prepaid balance per account, with recurring packages that auto-renew and expiry dates set per grant or per wallet.

• Multiple credit types stack with a custom priority and deduction order, so a promotional grant burns before the paid commitment.

• Rollover rules decide what unused balance carries into the next term instead of a manual credit note.

• Overages either charge the payment method automatically or block usage at the ceiling, and pricing models bill minimum commitments with overage separately.

• Wallet alerts fire below a threshold and auto top-ups refill, so account teams see burn-down before renewal.

• “We needed credits tied to plans at the platform level. Nothing else really handled it. Flexprice did.”* - Prajwal Prakash, CTO and Co-founder