From d04637da50e157e7fd583df2b13201a01972b6eb Mon Sep 17 00:00:00 2001
From: Jacob Lindahl <encody@users.noreply.github.com>
Date: Wed, 29 Mar 2023 21:05:56 +0900
Subject: [PATCH] Fix: rosetta zero balance accounts (#8830)

* fix: add zero-balance account check to rosetta

* fix: slightly less magic-numbery

---------

Co-authored-by: near-bulldozer[bot] <73298989+near-bulldozer[bot]@users.noreply.github.com>
---
 chain/rosetta-rpc/src/utils.rs | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/chain/rosetta-rpc/src/utils.rs b/chain/rosetta-rpc/src/utils.rs
index 2ebffe84d2e..ea431038d5d 100644
--- a/chain/rosetta-rpc/src/utils.rs
+++ b/chain/rosetta-rpc/src/utils.rs
@@ -269,14 +269,23 @@ where
     }
 }
 
+/// Zero-balance account (NEP-448)
+fn is_zero_balance_account(account: &near_primitives::account::Account) -> bool {
+    account.storage_usage() <= 770
+}
+
 /// Tokens not locked due to staking (=liquid) but reserved for state.
 fn get_liquid_balance_for_storage(
     account: &near_primitives::account::Account,
     storage_amount_per_byte: near_primitives::types::Balance,
 ) -> near_primitives::types::Balance {
-    let required_amount =
-        near_primitives::types::Balance::from(account.storage_usage()) * storage_amount_per_byte;
-    required_amount.saturating_sub(account.locked())
+    let staked_for_storage = if is_zero_balance_account(account) {
+        0
+    } else {
+        near_primitives::types::Balance::from(account.storage_usage()) * storage_amount_per_byte
+    };
+
+    staked_for_storage.saturating_sub(account.locked())
 }
 
 pub(crate) struct RosettaAccountBalances {