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Every workspace uses plan credits that renew each month. Creator and Pro workspaces can also buy top-ups when they need more before the next renewal. Plan prices and features are on 60db.ai/pricing.

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Plan credits

  • 1 credit = 1 TTS character. At pay-as-you-go usage rates, 1 credit = $0.00002 (50,000 credits per $1). The usage rates table on the pricing page lists the cost of each service.
  • Plan credits renew monthly, on monthly and yearly plans alike. Unused plan credits do not roll over, except when you upgrade or switch to yearly billing (see Annual billing).

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Concurrency limits

Each plan limits how many text-to-speech and speech-to-text requests a workspace can run at the same time. REST and WebSocket requests count together, and everyone using the workspace (members and API keys) shares the limit.
  • A request over the limit gets HTTP 429 with error_code TTS_CONCURRENCY_LIMIT or STT_CONCURRENCY_LIMIT, and details.limit / details.plan. On WebSocket the session is closed with code 1008 and the same error.
  • A slot frees as soon as a request finishes or the client disconnects. Retry then (with backoff), or upgrade for a higher limit.
  • GET /plans returns each plan’s concurrency, and GET /billing/current-plan returns your workspace’s.

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Annual billing

Starter, Creator and Pro can be billed monthly or yearly. A yearly plan costs 10 monthly payments, so you get 2 months free (about 16.7% off). Free has no yearly option.
  • Credits stay monthly. A yearly plan renews its plan credits every month, on the day your subscription started. You are billed once a year, but you get the same monthly allotment as on a monthly plan. Unused credits do not roll over.
  • Top-ups on Creator and Pro use the monthly plan rate, whichever billing cycle you choose.

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Switching plans

Changing a yearly plan to a monthly plan is not allowed in place. The API returns 403 YEARLY_TO_MONTHLY_NOT_ALLOWED.

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Refunds

Refunds are available within 14 days of payment and only if no plan or top-up credits were used. Contact 60db support to request one. There is no self-serve refund button. An approved refund returns the full payment and ends the plan immediately.

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Endpoints

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Deduction order

  1. Plan credits are used first.
  2. Top-up and bonus credits are used when plan credits run out. Top-up credits never expire and stay usable if you later move to a lower plan.

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When credits run out

What to do next:
  • Free or Starter: upgrade to Creator or Pro, or wait for the monthly renewal.
  • Creator or Pro: buy a top-up, or wait for the monthly renewal.

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Top-ups (Creator and Pro)

Top-ups are available to workspaces on the Creator and Pro plans with an active or trialing subscription.
  • Amount: $10 to $1,000 per top-up. Presets are $10, $25, $50 and $100.
  • Rate: top-ups are priced at your plan’s rate, not the usage rate.
Creator is about 18,181.8 credits per $1. Pro is about 20,202 credits per $1.
The credit amount is fixed when you start checkout. A later plan change does not change the credits you bought. A coupon lowers the price you pay, but it does not change the credits.

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Who can buy

Only the workspace owner can view or buy top-ups. This requires the billing:manage permission. Other roles receive 403 Forbidden. On Free and Starter, a top-up request returns 403 TOPUP_NOT_AVAILABLE_ON_PLAN.

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Check your balance and buy

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Automatic top-up (coming soon)

Automatic top-up is in development. When it is enabled for your account, it will reload credits from a saved card when your balance runs low, up to a monthly limit you set. It is not available yet, so buy top-ups manually for now.