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The playground at landedfees.com/developers/try is a hosted, prefilled UI for every v1 endpoint. It runs against the production API using a temporary sandbox key issued when you sign in, so you can test any endpoint without deploying code.

Open the playground

Prefilled request bodies for calc, calc/bulk, classify, compare, and rates. Live responses, copyable curl snippets.

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What is inside

  • Prefilled request bodies for every endpoint.
  • Live response viewer with syntax highlighting.
  • One-click copy of the exact curl command that produced the response.
  • Rate-limit header display so you can watch the burst window shrink.
  • Endpoint switcher with saved requests per browser.

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When to use it

  • Verifying a new HS code against real production rates.
  • Sanity-checking a bulk request payload before wiring it into your ETL.
  • Reproducing a bug report from a customer (paste their body, hit send, copy the response into the ticket).

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When to use the SDKs instead

  • Anything that runs on a schedule.
  • Anything that needs to persist results.
  • Anything you want under version control.
Install the Python or TypeScript SDK for production workloads.