Merge pull request #3223 from dfinity/oracle-info

add: Info about on-chain oracle examples

docs/developer-docs/smart-contracts/advanced-features/https-outcalls/https-outcalls-overview.mdx

@@ -12,6 +12,8 @@ Canister smart contracts can make a request to a URL using [HTTPS outcalls](http
 
 HTTPS outcalls enable a wide range of applications. For example, oracle services can directly integrate with ICP in a trustless manner, and dapps can provide user notifications or anything else that requires communication with servers on the Internet.
 
+Some examples of on-chain oracle-like services that obtain data from off-chain sources through HTTP outcalls include the [EVM RPC canister](/docs/current/developer-docs/multi-chain/ethereum/evm-rpc/overview), the [exchange rate canister](/docs/current/developer-docs/defi/exchange-rate-canister/) or the [Orally dapp](https://kclew-uiaaa-aaaal-qbuiq-cai.ic0.app/sybil).
+
 ## How it works
 
 For detailed information on how it works, please refer to the [HTTPS outcalls - How it works](/docs/current/references/https-outcalls-how-it-works).