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Documentation Index

Fetch the complete documentation index at: https://developers.heygen.com/llms.txt

Use this file to discover all available pages before exploring further.

HeyGen’s self-serve (Pay-As-You-Go) plan lets you purchase USD balance when you need it — no monthly subscription, no commitments.

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How Billing Works

When you authenticate with an API Key (x-api-key header), you are billed under the API tier. Usage is deducted from your prepaid USD wallet. Check your balance at any time: 
GET /v3/users/me → wallet
OAuth vs API Key: If you authenticate with an OAuth bearer token, usage is billed against your web plan, not the API tier. Check your web plan balance with GET /v3/users/me → subscription.Using an API Key is recommended for automation and integration workflows. API key authentication provides higher concurrency limits and is more flexible and powerful for programmatic use.

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Pricing

All rates are billed in USD based on output duration.

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Video Generation — Avatar IV & V

Avatar Type720p / 1080p4K
Photo Avatar$0.05 / sec$0.0667 / sec
Digital Twin$0.0667 / sec$0.0833 / sec
Studio Avatar$0.0667 / sec$0.0833 / sec

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Video Generation — Avatar III

Avatar III is available to existing customers only. It is not offered to new users. For all new integrations use Avatar IV or Avatar V.
Avatar Type720p / 1080p4K
Photo Avatar$0.0167 / sec$0.02 / sec
Digital Twin$0.0167 / sec$0.02 / sec
Studio Avatar$0.0167 / sec$0.02 / sec

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Video Agent

FeatureRate
Prompt to Video$0.0333 / sec

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Video Translation

ModeRate
Speed — Audio Only$0.0167 / sec
Speed — Lip Sync$0.0333 / sec
Precision — Lip Sync$0.0667 / sec
Note: Proofread mode is available on Enterprise plans only.

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Lipsync

ModeRate
Speed$0.0333 / sec
Precision$0.0667 / sec

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Text-to-Speech

ModelRate
Speech — Starfish$0.000667 / sec

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Avatar Creation

OperationRate
Digital Twin$1.00 per call
Photo Avatar$1.00 per call