diff --git a/fungible-xchain-v1.pact b/fungible-xchain-v1.pact
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+(interface fungible-xchain-v1
+
+  " This interface offers a standard capability for cross-chain \
+  \ transfers and associated events. "
+
+  (defcap TRANSFER_XCHAIN:bool
+    ( sender:string
+      receiver:string
+      amount:decimal
+      target-chain:string
+    )
+    @doc " Managed capability sealing AMOUNT for transfer \
+         \ from SENDER to RECEIVER on TARGET-CHAIN. Permits \
+         \ any number of cross-chain transfers up to AMOUNT."
+
+    @managed amount TRANSFER_XCHAIN-mgr
+    )
+
+  (defun TRANSFER_XCHAIN-mgr:decimal
+    ( managed:decimal
+      requested:decimal
+    )
+    @doc " Allows TRANSFER-XCHAIN AMOUNT to be less than or \
+         \ equal managed quantity as a one-shot, returning 0.0."
+  )
+
+  (defcap TRANSFER_XCHAIN_RECD:bool
+    ( sender:string
+      receiver:string
+      amount:decimal
+      source-chain:string
+    )
+    @doc "Event emitted on receipt of cross-chain transfer."
+    @event
+  )
+)