Add API endpoint usage examples

docs/Reference/Rest.md

@@ -22,6 +22,33 @@ The default location is `http://localhost:9000/swagger-ui`.
 
 You can also use tools such as [Postman] or [cURL] to interact with Web3Signer APIs.
 
+## Endpoint example usage
+
+### `/api/v1/eth2/publicKeys`
+
+Returns the ETH2 BLS public keys for the private keys that have been loaded into Web3Signer.
+
+### `/api/v1/eth2/sign/{identifier}`
+
+Signs data for the ETH2 BLS public key specified as part of the URL and returns the signature.
+
+### `/eth/v1/keystores`
+
+Lists all validating public keys known to and decrypted by this keymanager binary
+
+### `/reload`
+
+Reloads signer keys asynchronously.
+This is used after adding new keys to a current set of validators.
+The call reloads the keys and makes Web3signer aware of the change.
+Not used by validator clients
+
+### `/upcheck`
+
+Checks the Web3Signer server status.
+Confirms if Web3Signer is connected and running.
+Not used by validator clients
+
 <!-- Links -->
 [REST API documentation]: https://consensys.github.io/web3signer/
 [Postman]: https://www.postman.com/