Comparison
Enterprise is not self-selectable from your dashboard — contact sales to upgrade.
How limits are enforced
Every limit above maps to a specific point in the request pipeline. When you hit one, the API returns a documented error so your client can react:
Response bodies are always JSON of shape
{"message": "<reason>"}. The specific <reason> strings you’ll see:
Recharge commitment
Pro requires a minimum total deposit of $100 per calendar month. Enterprise commitments are negotiated per contract. This is a spend commitment, not a flat fee — any deposits you already made in the month count toward it. You pay only for what you consume; the unused balance carries over. If you miss a monthly commitment, the account enters a grace period (duration set per account by billing). During grace, your tier limits remain active. After grace expires without a qualifying deposit, the account is downgraded to Free.Free tier sandbox balance
Free accounts do not require a positive paid balance to create sandboxes — they consume the free credit grants described in Billing & Pricing. Once the free grant is exhausted, creation requests return402 Payment Required until you deposit funds or upgrade.
Pro and Enterprise require a positive wallet balance (free credits + paid balance combined) for any billable operation.