The base plan price is just the starting point. Auth0's full cost includes usage overages, add-ons, multi-tenant penalties, and implementation costs that catch teams off guard.
If you exceed your MAU tier, you're auto-upgraded to the next tier — not just charged per-MAU. A 5% growth spike can double your bill.
Machine-to-Machine (M2M) tokens — for API-to-API auth — are NOT included in B2C Essentials. Professional includes 1,000/month. Beyond that: $0.0002 per token.
Custom domains are included in Essentials+, but Enterprise customers with multiple custom domains pay per domain ($200+/year each).
MAU counts are per-tenant. Running 3 separate Auth0 tenants for staging/prod/region means 3x costs. Consolidation saves money.
Enterprise migration and implementation typically runs $10,000–$50,000 in consulting fees. Auth0's own PS team is expensive.
Priority support (SLA-backed) is an Enterprise-only feature. Developer plan users rely on community forums.
| Monthly M2M Tokens | Plan | Included | Overage Cost | Total M2M Cost |
|---|---|---|---|---|
| 500 | B2C Essentials | None | Not available | Upgrade required |
| 1,000 | B2C Professional | 1,000 free | $0 | $0 extra |
| 5,000 | B2C Professional | 1,000 free | $0.0002 × 4,000 | $0.80/mo |
| 50,000 | B2C Professional | 1,000 free | $0.0002 × 49,000 | $9.80/mo |
| 500,000 | B2C Professional | 1,000 free | $0.0002 × 499,000 | $99.80/mo |
| 5,000,000 | Enterprise | Custom bundle | Negotiated | Custom |
A common mistake: treating Auth0 tenants like lightweight environments. Each tenant is billed independently.
| Setup | Tenants | MAU per Tenant | Monthly Cost |
|---|---|---|---|
| Single prod tenant | 1 | 10,000 | $235/mo |
| Dev + Staging + Prod | 3 | 10,000 each | $705/mo |
| Prod + multi-region | 4 | 10,000 each | $940/mo |
| SaaS with per-customer tenants | 10 | 1,000 each | $550/mo |
Costs estimated from Auth0 Essentials tier pricing. Actual costs depend on plan selection.
Small startup, 5K MAU
Growing SaaS, 50K MAU
Enterprise, 200K MAU
Tips to Reduce Hidden Costs