# API3 Oracles

dAPIs operate in a familiar push model, meaning the price is updated on-chain according to pre-determined Oracle specifications. These are 0.25%, 0.5%, 1% and 5% update thresholds, with all Oracles having a 24hr heartbeat.

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You can learn more about dAPIs in the API3 documentation: <https://docs.api3.org/reference/dapis/understand/>
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### Oracles operated by API3&#x20;

API3 provides the following dAPIs for Zerolend to operate the correlating markets on the respective chain.

<table><thead><tr><th width="266">Data feed </th><th>Chain</th></tr></thead><tbody><tr><td>DAI/USD</td><td>X Layer </td></tr><tr><td>USDT/USD</td><td>X Layer </td></tr><tr><td>USDC/USD</td><td>X Layer </td></tr><tr><td>BTC/USD</td><td>X Layer </td></tr><tr><td>ETH/USD</td><td>X Layer</td></tr><tr><td>OKB/USD</td><td>X Layer </td></tr></tbody></table>