> For the complete documentation index, see [llms.txt](https://docs.tronsave.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tronsave.io/concepts/glossary.md).

# Glossary

<table><thead><tr><th width="244">Term</th><th>Definition</th></tr></thead><tbody><tr><td><strong>Energy</strong></td><td>TRON resource consumed to execute smart contracts (e.g. USDT TRC‑20 transfers). Obtained by staking TRX or renting on TronSave.</td></tr><tr><td><strong>Bandwidth</strong></td><td>TRON resource consumed by transaction byte size. Every transaction needs some.</td></tr><tr><td><strong>TRX</strong></td><td>The native token of the TRON network.</td></tr><tr><td><strong>SUN</strong></td><td>The smallest unit of TRX. <strong>1 TRX = 1,000,000 SUN.</strong> All prices are quoted in SUN.</td></tr><tr><td><strong>Stake 2.0</strong></td><td>TRON's staking (freeze) mechanism that produces Energy/Bandwidth. The basis of TronSave's supply.</td></tr><tr><td><strong>Delegation</strong></td><td>Granting Energy/Bandwidth from one account to another on‑chain. A filled order results in a delegation to the <code>receiver</code>.</td></tr><tr><td><strong>Provider / Seller</strong></td><td>A user who stakes TRX and rents out (delegates) the resulting Energy to earn APY.</td></tr><tr><td><strong>Buyer</strong></td><td>A user who rents Energy/Bandwidth from the marketplace.</td></tr><tr><td><strong>Order book</strong></td><td>The live set of buy/sell orders that determines the market price.</td></tr><tr><td><strong>Internal Account</strong></td><td>A TronSave‑managed balance you deposit TRX into; the API can spend from it automatically. Tied to an API Key.</td></tr><tr><td><strong>API Key</strong></td><td>A secret identifier linked to your Internal Account, used to authorize API requests.</td></tr><tr><td><strong>Signed Transaction</strong></td><td>An alternative auth method where you sign a TRX payment from your own wallet per purchase (full custody).</td></tr><tr><td><strong><code>unitPrice</code></strong></td><td>Price per resource unit in SUN, or a tier: <code>SLOW</code> / <code>MEDIUM</code> / <code>FAST</code>.</td></tr><tr><td><strong><code>resourceType</code></strong></td><td><code>ENERGY</code> or <code>BANDWIDTH</code>. Defaults to <code>ENERGY</code>.</td></tr><tr><td><strong><code>durationSec</code></strong></td><td>Rental duration in seconds. Default <code>259200</code> (3 days).</td></tr><tr><td><strong><code>receiver</code></strong></td><td>The TRON address that receives the rented resource.</td></tr><tr><td><strong><code>requester</code></strong></td><td>The address placing/representing the order (the <code>representAddress</code> of your internal account).</td></tr><tr><td><strong><code>fulfilledPercent</code></strong></td><td>Order fill status: <code>0</code> pending, <code>1–99</code> partial, <code>100</code> complete.</td></tr><tr><td><strong>APR / APY</strong></td><td>Provider returns. See <a href="/pages/t0iNX8oKahOWnMwukMLW">Pricing &#x26; APY</a> for formulas.</td></tr><tr><td><strong>WTRX</strong></td><td>Wrapped TRX, used in some SDK payment flows.</td></tr><tr><td><strong>ZapBuy</strong></td><td>Buy Energy by sending TRX directly to a bot address; fixed 1‑hour rental.</td></tr><tr><td><strong>Fast Charge</strong></td><td>API flow for rapid Energy charging (estimate → create → track → confirm).</td></tr><tr><td><strong>Nile</strong></td><td>The TRON testnet TronSave uses (<code>api-dev.tronsave.io</code>).</td></tr></tbody></table>

> Terminology standard: write **Energy** and **Bandwidth** capitalized when referring to the TRON resources; **TRX** and **SUN** in caps; field names in `code`.