diff --git a/rfc/0003 RFC GraphQL API for Duniter Clients.md b/rfc/0003 RFC GraphQL API for Duniter Clients.md
index da822ad2d893eae26db452af581dff2eec4e04ac..8611d24498fcad37637597fd5b556cc178cc8c01 100644
--- a/rfc/0003 RFC GraphQL API for Duniter Clients.md	
+++ b/rfc/0003 RFC GraphQL API for Duniter Clients.md	
@@ -379,10 +379,8 @@ The SSL endpoint string is:
 ## API GraphQL Schema
 
 ```graphql
-
 schema {
   query: Query
-  mutation: Mutation
 }
 
 type Query {
@@ -400,30 +398,15 @@ type Summary {
     forkWindowSize: Int!
 }
 
-interface Sandbox {
-    size: Int!
-    free: Int!
-}
-
-type IdentitiesSandbox implements Sandbox {
-    size: Int!
-    free: Int!
-}
-
-type MembershipsSandbox implements Sandbox {
-    size: Int!
-    free: Int!
-}
-
-type TransactionsSandbox implements Sandbox {
+type Sandbox {
     size: Int!
     free: Int!
 }
 
 type Sandboxes {
-    identities: IdentitiesSandbox
-    memberships: MembershipsSandbox
-    transactions: TransactionsSandbox
+    identities: Sandbox!
+    memberships: Sandbox!
+    transactions: Sandbox!
 }
 
 ```