The Free plan
The FluxRouter Free plan: $1 of routing per month, a hard stop at the cap so there's no surprise bill, and why a card is required at signup but never charged.
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 Express Lane routing per month, on us.
- Express 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.
Why do I need a card if Free is free?
A card is required at signup as an anti-abuse measure. It is not charged on Free. The card requirement keeps automated abuse and throwaway-account farming off the platform, which is what lets us give every account real routing and the full model list for free. Adding a card on Free does not start any charges.
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 Express Lane rate. As a rough sense, $1 of Express 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.