Meta opened its first paid API on July 9, 2026, letting developers tap the Muse Spark 1.1 model for $1.25 per million input tokens and $4.25 per million output tokens. New accounts receive $20 in free credits, but the service currently serves only US-based developers.
Pricing that matters
The API uses a metered model: every million input tokens costs $1.25, and every million output tokens costs $4.25.
How to move an existing agent over
Muse Spark 1.1 supports both OpenAI-style Chat Completions and Anthropic-style Messages formats. To switch, developers point their client at https://api.meta.ai/v1, add a new API key, and set the model ID.
US-first rollout and the waitlist
Meta’s preview is self-serve for developers in the United States. Developers in India, the United Kingdom, and other regions can join a waitlist but cannot bill until Meta expands the offering.
Takeaway
The paid Muse Spark 1.1 API gives US developers a ready-to-use, token-metered large-language model with minimal migration friction.