Billing & Usage
Every ZID gets a generous free tier. Usage is metered per-computation and per-AI-chat-message, resetting daily at midnight UTC.
Free Tier
On registration, every ZID receives:
| Resource | Daily Limit | Cost |
|---|---|---|
| Computations | 10 / day | Free |
| AI Chat Messages | 10 / day | Free |
| API Keys | 3 active | Free |
| Equation Vault | Unlimited | Free |
Usage Tracking
Check your current usage at any time via the Account API or the Account Dashboard.
curl https://www.zeq.dev/api/account/usage \
-H "Authorization: Bearer YOUR_API_KEY"Response:
{
"computations": { "used": 7, "limit": 10, "period": "day" },
"chat": { "used": 3, "limit": 10, "period": "day" },
"resetsAt": "2026-04-21T00:00:00Z"
}API Key Management
Create up to 3 API keys from the Account Dashboard or via the Account API. Keys can be revoked instantly.
Overages
When you hit your daily limit, the API returns 429 Too Many Requests with a Retry-After header indicating when your quota resets. No charges are incurred — the free tier simply pauses until the next UTC day.