Add Base L2 remote chain support

lib/chains/chains.ex

@@ -175,7 +175,7 @@ defmodule Chains.Moonriver do
   def expected_block_intervall(), do: 6
   def epoch(n), do: Chains.epoch(__MODULE__, n)
   def epoch_progress(n), do: Chains.epoch_progress(__MODULE__, n)
-  def epoch_block(block), do: Chains.epoch_block(__MODULE__, block)
+  def epoch_block(epoch), do: Chains.epoch_block(__MODULE__, epoch)
   def epoch_duration(), do: 2_592_000
   def chain_prefix(), do: "movr"
 
@@ -206,3 +206,20 @@ defmodule Chains.OasisSapphire do
   def developer_fleet_address(), do: raise("not implemented")
   def transaction_hash(), do: &Hash.keccak_256/1
 end
+
+defmodule Chains.Base do
+  alias DiodeClient.{Base16, Hash, Shell.Base}
+
+  def chain_id(), do: Base.chain_id()
+  def expected_block_intervall(), do: 2
+  def epoch(n), do: Chains.epoch(__MODULE__, n)
+  def epoch_progress(n), do: Chains.epoch_progress(__MODULE__, n)
+  def epoch_block(epoch), do: Chains.epoch_block(__MODULE__, epoch)
+  def epoch_duration(), do: 2_592_000
+  def chain_prefix(), do: "base"
+  def rpc_endpoints(), do: RemoteChain.ChainList.rpc_endpoints(__MODULE__)
+  def ws_endpoints(), do: RemoteChain.ChainList.ws_endpoints(__MODULE__)
+  def registry_address(), do: Base16.decode("0xfbfAF5BfF947869490C05d949c1BA5e260D6bd6E")
+  def developer_fleet_address(), do: Base16.decode("0x5c6ED819886b77017baAf81ef0E7abEAcb17bD1D")
+  def transaction_hash(), do: &Hash.keccak_256/1
+end

lib/contract/node_registry.ex

@@ -9,9 +9,11 @@ defmodule Contract.NodeRegistry do
   alias DiodeClient.{ABI, Base16}
   @address "0xc4b466f63c0A31302Bc8A688A7c90e1199Bb6f84" |> Base16.decode()
   @token "0x434116a99619f2B465A137199C38c1Aab0353913" |> Base16.decode()
-  @chain_id 1284
+  @chain_id Chains.Moonbeam.chain_id()
   @max_uint256 115_792_089_237_316_195_423_570_985_008_687_907_853_269_984_665_640_564_039_457_584_007_913_129_639_935
 
+  # Post-freeze: point @address, @token, and @chain_id at the Base NodeRegistry deployment.
+
   def address(), do: @address
   def token(), do: @token
   def chain_id(), do: @chain_id

lib/remote_chain/call_permit_adapter.ex

@@ -3,7 +3,7 @@ defmodule CallPermitAdapter do
 
   def should_forward_metatransaction?(chain) do
     chain not in [Chains.Diode, Chains.DiodeStaging, Chains.DiodeDev] and
-      Shell.get_balance(chain, Diode.address()) / Shell.ether(1) < 1
+      Shell.get_balance(chain, Diode.address()) / Shell.ether(1) < 0.000001
   end
 
   # RLP encoded MetaTransaction

lib/remote_chain/remote_chain.ex

@@ -34,7 +34,8 @@ defmodule RemoteChain do
     @chains [
       Chains.Diode,
       Chains.Moonbeam,
-      Chains.OasisSapphire
+      Chains.OasisSapphire,
+      Chains.Base
     ]
   end
 

mix.lock

@@ -16,7 +16,7 @@
   "deoxysii": {:hex, :deoxysii, "1.0.4", "6514fc898fef5a24287770d6c2e2ffeb7ff332bd2ff2d7018b099dc1fc057b95", [:mix], [], "hexpm", "5c4ab28b0d81e552d504b28dc55cda5cf9f89405daa1a3c8f896557627ba5cac"},
   "dets_plus": {:hex, :dets_plus, "2.4.4", "35ecb72d079bb8423e6bc849b45705ac4dec5a1e0fca6a2d746e0a60e8b04ae4", [:mix], [{:paged_file, "~> 1.1", [hex: :paged_file, repo: "hexpm", optional: false]}], "hexpm", "b79782f150750f5686f47fc064bbe19bc43f6b2d56fbcc9267ec813aa8d07285"},
   "dialyxir": {:hex, :dialyxir, "1.4.7", "dda948fcee52962e4b6c5b4b16b2d8fa7d50d8645bbae8b8685c3f9ecb7f5f4d", [:mix], [{:erlex, ">= 0.2.8", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm", "b34527202e6eb8cee198efec110996c25c5898f43a4094df157f8d28f27d9efe"},
-  "diode_client": {:git, "https://github.com/diodechain/diode_client_ex.git", "51b2e98cb3418dd70dc6fe2221294ed2b61d760f", []},
+  "diode_client": {:git, "https://github.com/diodechain/diode_client_ex.git", "c8674be20c5535cbd2802f827df46100ba6d04ca", []},
   "earmark_parser": {:hex, :earmark_parser, "1.4.44", "f20830dd6b5c77afe2b063777ddbbff09f9759396500cdbe7523efd58d7a339c", [:mix], [], "hexpm", "4778ac752b4701a5599215f7030989c989ffdc4f6df457c5f36938cc2d2a2750"},
   "eblake2": {:hex, :eblake2, "1.0.0", "ec8ad20e438aab3f2e8d5d118c366a0754219195f8a0f536587440f8f9bcf2ef", [:rebar3], [], "hexpm", "3c4d300a91845b25d501929a26ac2e6f7157480846fab2347a4c11ae52e08a99"},
   "elixir_make": {:hex, :elixir_make, "0.9.0", "6484b3cd8c0cee58f09f05ecaf1a140a8c97670671a6a0e7ab4dc326c3109726", [:mix], [], "hexpm", "db23d4fd8b757462ad02f8aa73431a426fe6671c80b200d9710caf3d1dd0ffdb"},

test/chains/base_test.exs

@@ -0,0 +1,18 @@
+# Diode Server
+# Copyright 2021-2025 Diode
+# Licensed under the Diode License, Version 1.1
+defmodule Chains.BaseTest do
+  use ExUnit.Case, async: true
+
+  test "Chains.Base chain metadata" do
+    assert Chains.Base.chain_id() == 8453
+    assert Chains.Base.expected_block_intervall() == 2
+    assert Chains.Base.chain_prefix() == "base"
+    assert RemoteChain.chainimpl(Chains.Base) == Chains.Base
+  end
+
+  test "Chains.Base exposes contract addresses" do
+    assert byte_size(Chains.Base.registry_address()) == 20
+    assert byte_size(Chains.Base.developer_fleet_address()) == 20
+  end
+end