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While UponAI generally bills based on actual call duration, certain call characteristics result in adjusted billing to ensure fair pricing.

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Rule 1: Minimum Duration for Dynamic Opening Messages

When it applies: Calls shorter than 10 seconds that use dynamic opening messages (AI speaks first). Billing adjustment: Minimum charge of 10 seconds. Example:
  • Call duration: 6 seconds
  • Dynamic opening messages: Enabled
  • Billed duration: 10 seconds (4 seconds additional charge)
Why: Dynamic opening messages require processing time regardless of call length, so a minimum charge covers these costs.

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Rule 2: LLM Price Scaling for Prompts Over 3,500 Tokens

When it applies: Agents using more than 3,500 LLM tokens in their prompts. Billing adjustment: Duration is scaled proportionally based on token usage. What counts toward token calculation:
  • Global prompt
  • Functions (tool descriptions)
  • State / node prompt
  • Transcript between agent and user
  • Tool call history and results
Flex mode commonly triggers this rule. It compiles all node prompts, transitions, and tool descriptions into a single LLM context, which can push the token count well above 3,500.
Price calculation: 
Scaling Factor = Prompt LLM Tokens ÷ 3,500
Billed Duration = Original Duration × Scaling Factor (rounded up)
Example:
  • Call duration: 60 seconds
  • LLM tokens used: 4,200
  • Scaling factor: 4,200 ÷ 3,500 = 1.2
  • Billed duration: 72 seconds (12 seconds additional charge)
Why: Larger LLM prompts incur greater costs due to token-based pricing from underlying model providers.