# Order Types / Strategies

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If an unauthorized error is returned when using an order type, contact Aquanow's support to enable it.
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<table><thead><tr><th width="155">Order Type</th><th width="321">Description</th><th>Applicable Fields</th></tr></thead><tbody><tr><td>RFQ</td><td><p>Two-stage: Request for quote and confirmation.  </p><p><em>8 second execution window by default.</em></p></td><td><p></p><ul><li>Receive / Deliver Quantity</li><li>UsernameRef (optional) - user provided reference</li></ul></td></tr><tr><td>Market </td><td><p>Immediate execution.</p><p>Users will be prompted to confirm orders prior to execution. </p></td><td><ul><li>Receive / Deliver Quantity</li><li>UsernameRef (optional) - user provided reference</li></ul></td></tr><tr><td>Limit</td><td><p>Instruction to buy/sell up to/down to a set price.</p><p>User sets price parameters. </p><p><em>Limit stays open for 24 hours.</em> </p></td><td><p></p><ul><li>Limit Price</li><li>Receive / Deliver Quantity</li><li>UsernameRef (optional) - user provided reference</li></ul></td></tr><tr><td>GTC/GTD</td><td><p>"Good-Till-Cancel" / "Good-Till-Date" limit orders. </p><p><em>Set to expire at a specific user entered date or at max after 90 days.</em> </p></td><td><p></p><ul><li>Limit Price</li><li>Receive / Deliver Quantity</li><li>UsernameRef (optional) - user provided reference</li><li>Expiration Time (Required for GTD)</li></ul></td></tr><tr><td>TWAP</td><td>Time-Weighted Average Price (TWAP) is used when buying or selling large amounts of digital assets over time, with the ability to choose the amount being bought/sold and its time period.</td><td><ul><li>Limit price</li><li>Quantity of currency</li><li>Total (price x quantity)</li><li>Duration (in min)</li><li>UsernameRef (optional) - user provided reference</li></ul></td></tr></tbody></table>