The Free plan
The FluxRouter Free plan: $1 of routing per month and a hard stop at the cap so there's no surprise bill.
The Free plan lets you try FluxRouter with zero commitment. It includes $1 of routing every month and hard-stops at that cap, so you can never run up a surprise bill.
What does Free include?
- $1 of Fast-lane routing per month, on us.
- Fast-lane rates: $1 per 1M input tokens, $4 per 1M output tokens.
- Access to the full model list and the same smart routing as paid plans.
- 1 request per second.
- Community and docs support.
The $1 is a real allowance against live routing, not credit you have to spend down a particular way. Send requests to flux-auto and FluxRouter routes them for you, billed at the lane rate of whichever model served each request.
What happens when I hit the $1 cap?
Free hard-stops at the cap. Once your routing for the month reaches $1, further requests are blocked with an HTTP 402 until the cap resets. There is no overage and no surprise bill: the plan simply stops serving rather than charging you. See What a 402 error means.
The cap resets each month. To keep going without waiting, move to a paid plan. See Plans and what's included.
How much can I actually do with $1?
It depends on the size of your prompts and responses, since you are metered by tokens at the Fast-lane rate. As a rough sense, $1 of Fast-lane routing covers on the order of hundreds of thousands of input tokens, plus output billed at the output rate. Use it to wire up your SDK, confirm the one-line base URL change works, and see real routing decisions and costs on the X-Flux-Cost-Usd response header before you commit to a plan. See Reading your usage and invoices.
How do I upgrade?
Pick a paid plan on the pricing page. Pay As You Go has no monthly fee and meters usage directly; Builder and Scale add an included monthly routing credit and a higher spend ceiling. Your API key does not change when you upgrade.