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Declaw Cloud has three tiers. Free is self-serve with no spend commitment; Pro is self-serve with a monthly recharge minimum; Enterprise is contact-sales.

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Comparison

FreeProEnterprise
Concurrent sandboxes2550010,000
Max session duration1 hour72 hours7 days
Max vCPUs / sandbox41664
Max memory / sandbox4 GB16 GB64 GB
Max disk / sandbox10 GB50 GB200 GB
Max egress connections / sandbox502002,500
General requests / sec5002,00010,000
Sandbox creates / sec21050
Deposit range5–5 – 10010–10 – 5,000100–100 – 50,000
Minimum monthly recharge—$100$1,500
Self-serve upgrade✓✓Contact sales
Enterprise is not self-selectable from your dashboard — contact sales to upgrade. Enterprise accounts can also negotiate custom limits above the numbers shown.

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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:
Limit hitHTTP status
Concurrent sandboxes429
Session duration (request timeout > tier max)403
vCPUs / memory / disk (template or request)403
General request rate429
Sandbox create rate429
Response bodies are always JSON of shape {"message": "<reason>"}. The specific <reason> strings you’ll see: 
{ "message": "concurrent sandbox limit reached for tier: pro" }
{ "message": "session duration exceeds tier limit" }
{ "message": "vcpu limit exceeds tier allowance" }
{ "message": "memory limit exceeds tier allowance" }
{ "message": "disk limit exceeds tier allowance" }
{ "message": "rate limit exceeded" }
{ "message": "sandbox creation rate limit exceeded" }
See Errors & Rate Limits for full handling guidance.

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Recharge commitment

Pro and Enterprise require a minimum total deposit per calendar month (100and100 and 1,500 respectively). 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.

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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 return 402 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.