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+---
+sip: 24
+title: WebSocket Connections
+status: Draft
+discussions-to: https://github.com/MetaMask/SIPs/discussions/142
+author: Muji (@tmpfs)
+created: 2024-08-08
+---
+
+## Abstract
+
+This SIP describes a way for Snaps using the Keyring API to establish WebSocket connections.
+
+## Motivation
+
+Snaps that need to perform multi-party computation (MPC) for threshold signatures schemes (TSS) require sending various messages in rounds to participants over the network; MPC communication is best suited to a session-based WebSocket connection. This SIP is concerned with using WebSocket connections to sign transactions as part of the Keyring API and not the more generic use case defined in [SIP-20](/SIPS/sip-20.md).
+
+## Specification
+
+> Formal specifications are written in TypeScript.
+
+### Language
+
+The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
+"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
+"OPTIONAL" written in uppercase in this document are to be interpreted as described in [RFC 2119](https://www.ietf.org/rfc/rfc2119.txt)
+
+### Snap Manifest
+
+This SIP specifies an addendum that MAY be applied to existing and future Snap handler permissions for `endowment:network-access`. The addendum is that the `allowedOrigins` array may contain URLs using the `wss:` or `ws:` schemes.
+
+The caveat is specified as follows in the manifest:
+
+```json
+{
+  "initialPermissions": {
+    "endowment:network-access": {
+      "allowedOrigins": [
+        "https://tss.ac",
+        "wss://relay.tss.ac"
+      ]
+    },
+  }
+}
+```
+
+## Copyright
+
+Copyright and related rights waived via [CC0](../LICENSE).