> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rumik.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# pay as you go

> use the silk services you need and pay for your usage.

pay only for the usage your account generates. payg has no monthly plan and
includes access to every silk model. it is designed for light or irregular
usage and has an account-wide cap of **4 concurrent requests**.

## pricing

| product             |               india |              rest of world |
| ------------------- | ------------------: | -------------------------: |
| silk mulberry tts   | ₹0.50/1k characters | inr price converted to usd |
| silk muga tts       | ₹0.99/1k characters | inr price converted to usd |
| silk mulberry agent |           ₹1.99/min |                \$0.024/min |
| silk muga agent     |           ₹2.99/min |                \$0.036/min |

tts is prorated for the exact submitted `text` character count. whitespace,
punctuation, newlines, and inline tags count; mulberry's `description` does not.
for rest-of-world accounts, the canonical inr tts price is converted with
silk's current shared inr exchange-rate snapshot. agents remain billed from
server-measured call milliseconds. audio milliseconds are recorded for tts
telemetry but never determine a payg tts charge. payg requests use the
plan's usage-based pricing; api requests never buy capacity automatically.

## account-wide capacity

capacity belongs to the account, not an api key, project, voice, or model.
mulberry, muga, and agents all draw from the same four request slots. if all
slots are busy, silk fails fast with http `429`, code
`concurrency_limit_exceeded`, and the active count plus the account limit.

usage is available on the dashboard.

## ready to build?

<Card title="get an api key" icon="key" href="https://playground.rumik.ai/api-keys" horizontal>
  create a key and make your first request in the [quickstart](/quickstart).
</Card>