diff --git a/domains/plain.com/integrations.json b/domains/plain.com/integrations.json
new file mode 100644
index 00000000..1e854ab3
--- /dev/null
+++ b/domains/plain.com/integrations.json
@@ -0,0 +1,23 @@
+{
+  "description": "Plain is a customer support platform for B2B software companies, centered on shared threads across email, Slack, and chat, with customer and tenant management and a help center.",
+  "discoveredAt": "2026-07-03T00:00:00.000Z",
+  "domain": "plain.com",
+  "summary": "Plain (plain.com) exposes an official remote MCP server at `https://mcp.plain.com/mcp` authenticated over OAuth, and a Bearer-authenticated GraphQL API at `https://core-api.uk.plain.com/graphql/v1` for support workflows — threads, customers, tenants, labels, and help-center content.",
+  "surfaces": [
+    {
+      "authStatus": "required",
+      "name": "Plain MCP server",
+      "slug": "plain-mcp-server",
+      "type": "mcp",
+      "url": "https://mcp.plain.com/mcp"
+    },
+    {
+      "authStatus": "required",
+      "name": "Plain GraphQL API",
+      "slug": "plain-graphql-api",
+      "spec": "https://core-api.uk.plain.com/graphql/v1/schema.graphql",
+      "type": "graphql",
+      "url": "https://core-api.uk.plain.com/graphql/v1"
+    }
+  ]
+}