> For the complete documentation index, see [llms.txt](https://docs-sdk.crypto-chief.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-sdk.crypto-chief.com/processing/python/concepts.md).

# Concepts

How the SDK handles the details that matter across every endpoint.

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>🔢 Amounts &#x26; precision</strong></td><td>Why you must never use float for crypto amounts.</td><td><a href="/pages/WE4acj3pSkH71IOUqZLB">/pages/WE4acj3pSkH71IOUqZLB</a></td></tr><tr><td><strong>⚠️ Errors &#x26; retries</strong></td><td>Stable error codes, helpers, and safe auto-retry.</td><td><a href="/pages/FYr2TQmzPzcYajzPqJ0n">/pages/FYr2TQmzPzcYajzPqJ0n</a></td></tr><tr><td><strong>⛓️ Supported chains</strong></td><td>25+ chains, families, and contract-call support.</td><td><a href="/pages/PBADTg0Sd8sZXcZRQBnr">/pages/PBADTg0Sd8sZXcZRQBnr</a></td></tr><tr><td><strong>🔁 Idempotency</strong></td><td>How order_id makes retries impossible to double-spend.</td><td><a href="/pages/4387eZy8zqV34B8i8SRH">/pages/4387eZy8zqV34B8i8SRH</a></td></tr></tbody></table>