How rate limits work
Anonymous traffic from the playground (no key entered) is capped at 25 requests per day per IP — shared across every endpoint. A free API key lifts that to 100 requests per day per key. Pro keys get 50,000 requests per calendar month plus priority routing. Limits reset on a rolling window, not at midnight UTC, so a burst now doesn't poison your bucket for the whole day.
If you hit a 429, the response body includes an upgrade_url field pointing at /pricing — the playground surfaces that as a one-click upgrade link in the response panel.
FAQ
What is an API key?
A string like fu_live_… that identifies your account. You get one for free by registering an email on the /api-docs page. Without a key you can still try every endpoint here — anonymous traffic is capped at 25 requests per day per IP.
What counts as a request?
Every Send click that reaches the FreightUtils API counts as one request against your daily or monthly budget. Failed requests (400/401/429/5xx) still count, the same as on any other REST API.
What is a Pro key?
Pro plans lift the limit to 50,000 requests per month for £19/mo. The plan is for production integrations; the free tier is fine for everything else.
Can I share my key?
Don't — your key inherits your plan and counts against your quota. The playground stores keys only in your browser's localStorage (and only if you tick the box). The displayed key is redacted to fu_live_***LAST8 unless you click 'Show full key'.