> For the complete documentation index, see [llms.txt](https://echo-protocol.gitbook.io/echo-protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://echo-protocol.gitbook.io/echo-protocol/echo-integration/oracle-overview/chainlink.md).

# Chainlink

Echo Lending uses the [industry standard decentralized oracles Chainlink](https://docs.chain.link/data-feeds) as its **primary** oracle, which provides highly secure and reliable, tamper-resistant data feeds. 

Chainlink oracles are used across our Aptos instance:

| **Asset**  |
| ---------- |
| aBTC PoR   |
| BTC-USD    |
| USDT-USD   |
| USDC-USD   |
| APT-USD    |
| eAPT-APT   |
| TruAPT-APT |

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Chainlink Proof of Reserves enables the reliable and timely monitoring of reserve assets for aBTC.

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