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Credits in VyomFlow gate access to tool calls. LLM usage routed through the OpenRouter free tier costs zero application credits, so your balance is only consumed when the agent invokes a tool during a turn.

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Admission check

When you send a message, the API checks your credit balance upfront. If the initial admission cannot be covered, the request returns 402 INSUFFICIENT_CREDITS before any message is persisted or any provider call is made.

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Reservation and top-ups

The orchestrator reserves a minimum credit hold at the start of the turn. If a tool call needs more than the reservation covers, it tops up the hold before dispatching. If your remaining balance cannot cover a top-up, the turn terminates safely: completed tool calls are settled, and the untouched remainder of the reservation is released.

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Settlement

At the end of the turn, the final credit cost is settled against your balance. The total deducted reflects only the work that was actually performed.

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Zero-cost usage

LLM calls routed through OpenRouter’s free tier are recorded for observability at zero application-credit cost. You only spend credits when tool calls run.
Credits are never charged retroactively for work already completed. If a turn terminates mid-run, only the tools that actually ran are settled.