feat: support proxy with grpc-only mode

CHANGELOG.md

@@ -16,6 +16,7 @@
 
 - [\#589](https://github.com/cosmos/evm/pull/589) Remove parallelization blockers via migration from transient to object store, refactoring of gas, indexing, and bloom utilities.
 - [\#768](https://github.com/cosmos/evm/pull/768) Added ICS-02 Client Router precompile
+- [\#815](https://github.com/cosmos/evm/pull/815) Support for multi gRPC query clients serve with old binary.
 
 ### BUG FIXES
 

evmd/go.mod

@@ -289,6 +289,7 @@ require (
 replace (
 	// use cosmos fork of keyring
 	github.com/99designs/keyring => github.com/cosmos/keyring v1.2.0
+	github.com/cosmos/cosmos-sdk => github.com/mmsqe/cosmos-sdk v0.46.0-beta2.0.20251117111808-6aaa69ce93f3
 	github.com/cosmos/evm => ../
 	// use Cosmos geth fork
 	// branch: release/1.16

evmd/go.sum

@@ -272,8 +272,6 @@ github.com/cosmos/cosmos-db v1.1.3 h1:7QNT77+vkefostcKkhrzDK9uoIEryzFrU9eoMeaQOP
 github.com/cosmos/cosmos-db v1.1.3/go.mod h1:kN+wGsnwUJZYn8Sy5Q2O0vCYA99MJllkKASbs6Unb9U=
 github.com/cosmos/cosmos-proto v1.0.0-beta.5 h1:eNcayDLpip+zVLRLYafhzLvQlSmyab+RC5W7ZfmxJLA=
 github.com/cosmos/cosmos-proto v1.0.0-beta.5/go.mod h1:hQGLpiIUloJBMdQMMWb/4wRApmI9hjHH05nefC0Ojec=
-github.com/cosmos/cosmos-sdk v0.54.0-beta.0 h1:KOyM1CjuriSxMm2CNhceGfEc2LbRWuImKw7L9yp3+SM=
-github.com/cosmos/cosmos-sdk v0.54.0-beta.0/go.mod h1:VBGchDTNoLW3xNy5mPNlnDFZiEjgRN/06vwSkXuBQdg=
 github.com/cosmos/go-bip39 v1.0.0 h1:pcomnQdrdH22njcAatO0yWojsUnCO3y2tNoV1cb6hHY=
 github.com/cosmos/go-bip39 v1.0.0/go.mod h1:RNJv0H/pOIVgxw6KS7QeX2a0Uo0aKUlfhZ4xuwvCdJw=
 github.com/cosmos/go-ethereum v1.16.2-cosmos-1 h1:QIaIS6HIdPSBdTvpFhxswhMLUJgcr4irbd2o9ZKldAI=
@@ -738,6 +736,8 @@ github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyua
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/mitchellh/pointerstructure v1.2.0 h1:O+i9nHnXS3l/9Wu7r4NrEdwA2VFTicjUEN1uBnDo34A=
 github.com/mitchellh/pointerstructure v1.2.0/go.mod h1:BRAsLI5zgXmw97Lf6s25bs8ohIXc3tViBH44KcwB2g4=
+github.com/mmsqe/cosmos-sdk v0.46.0-beta2.0.20251117111808-6aaa69ce93f3 h1:/QA3gFnuWLFihwNzVxvaE7GU9hhMH6PASvaLG5QdHu8=
+github.com/mmsqe/cosmos-sdk v0.46.0-beta2.0.20251117111808-6aaa69ce93f3/go.mod h1:VBGchDTNoLW3xNy5mPNlnDFZiEjgRN/06vwSkXuBQdg=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=

evmd/tests/network/util.go

@@ -128,7 +128,6 @@ func startInProcess(cfg Config, val *Validator) error {
 		if val.Ctx == nil || val.Ctx.Viper == nil {
 			return fmt.Errorf("validator %s context is nil", val.Moniker)
 		}
-
 		val.jsonrpc, err = server.StartJSONRPC(
 			ctx,
 			val.Ctx,

go.mod

@@ -109,7 +109,6 @@ require (
 	github.com/bytedance/sonic/loader v0.3.0 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/chigopher/pathlib v0.19.1 // indirect
 	github.com/chzyer/readline v1.5.1 // indirect
 	github.com/cloudwego/base64x v0.1.5 // indirect
 	github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443 // indirect
@@ -184,12 +183,10 @@ require (
 	github.com/hdevalence/ed25519consensus v0.2.0 // indirect
 	github.com/holiman/bloomfilter/v2 v2.0.3 // indirect
 	github.com/huandu/skiplist v1.2.1 // indirect
-	github.com/huandu/xstrings v1.4.0 // indirect
 	github.com/huin/goupnp v1.3.0 // indirect
 	github.com/iancoleman/strcase v0.3.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
-	github.com/jinzhu/copier v0.4.0 // indirect
 	github.com/jmhodges/levigo v1.0.0 // indirect
 	github.com/klauspost/compress v1.18.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
@@ -246,7 +243,6 @@ require (
 	github.com/tklauser/numcpus v0.10.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ulikunitz/xz v0.5.15 // indirect
-	github.com/vektra/mockery/v2 v2.53.5 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	github.com/zeebo/errs v1.4.0 // indirect
 	github.com/zondax/golem v0.27.0 // indirect
@@ -268,7 +264,6 @@ require (
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/arch v0.21.0 // indirect
 	golang.org/x/exp v0.0.0-20250506013437-ce4c2cf36ca6 // indirect
-	golang.org/x/mod v0.28.0 // indirect
 	golang.org/x/oauth2 v0.31.0 // indirect
 	golang.org/x/sys v0.37.0 // indirect
 	golang.org/x/term v0.36.0 // indirect
@@ -288,6 +283,7 @@ require (
 replace (
 	// use cosmos fork of keyring
 	github.com/99designs/keyring => github.com/cosmos/keyring v1.2.0
+	github.com/cosmos/cosmos-sdk => github.com/mmsqe/cosmos-sdk v0.46.0-beta2.0.20251117111808-6aaa69ce93f3
 	// use Cosmos geth fork
 	// branch: release/1.16
 	github.com/ethereum/go-ethereum => github.com/cosmos/go-ethereum v1.16.2-cosmos-1

go.sum

@@ -204,8 +204,6 @@ github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UF
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
 github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
-github.com/chigopher/pathlib v0.19.1 h1:RoLlUJc0CqBGwq239cilyhxPNLXTK+HXoASGyGznx5A=
-github.com/chigopher/pathlib v0.19.1/go.mod h1:tzC1dZLW8o33UQpWkNkhvPwL5n4yyFRFm/jL1YGWFvY=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/logex v1.2.1 h1:XHDu3E6q+gdHgsdTPH6ImJMIp436vR6MPtH8gP05QzM=
 github.com/chzyer/logex v1.2.1/go.mod h1:JLbx6lG2kDbNRFnfkgvh4eRJRPX1QCoOIWomwysCBrQ=
@@ -269,8 +267,6 @@ github.com/cosmos/cosmos-db v1.1.3 h1:7QNT77+vkefostcKkhrzDK9uoIEryzFrU9eoMeaQOP
 github.com/cosmos/cosmos-db v1.1.3/go.mod h1:kN+wGsnwUJZYn8Sy5Q2O0vCYA99MJllkKASbs6Unb9U=
 github.com/cosmos/cosmos-proto v1.0.0-beta.5 h1:eNcayDLpip+zVLRLYafhzLvQlSmyab+RC5W7ZfmxJLA=
 github.com/cosmos/cosmos-proto v1.0.0-beta.5/go.mod h1:hQGLpiIUloJBMdQMMWb/4wRApmI9hjHH05nefC0Ojec=
-github.com/cosmos/cosmos-sdk v0.54.0-beta.0 h1:KOyM1CjuriSxMm2CNhceGfEc2LbRWuImKw7L9yp3+SM=
-github.com/cosmos/cosmos-sdk v0.54.0-beta.0/go.mod h1:VBGchDTNoLW3xNy5mPNlnDFZiEjgRN/06vwSkXuBQdg=
 github.com/cosmos/go-bip39 v1.0.0 h1:pcomnQdrdH22njcAatO0yWojsUnCO3y2tNoV1cb6hHY=
 github.com/cosmos/go-bip39 v1.0.0/go.mod h1:RNJv0H/pOIVgxw6KS7QeX2a0Uo0aKUlfhZ4xuwvCdJw=
 github.com/cosmos/go-ethereum v1.16.2-cosmos-1 h1:QIaIS6HIdPSBdTvpFhxswhMLUJgcr4irbd2o9ZKldAI=
@@ -602,8 +598,6 @@ github.com/huandu/go-assert v1.1.5 h1:fjemmA7sSfYHJD7CUqs9qTwwfdNAx7/j2/ZlHXzNB3
 github.com/huandu/go-assert v1.1.5/go.mod h1:yOLvuqZwmcHIC5rIzrBhT7D3Q9c3GFnd0JrPVhn/06U=
 github.com/huandu/skiplist v1.2.1 h1:dTi93MgjwErA/8idWTzIw4Y1kZsMWx35fmI2c8Rij7w=
 github.com/huandu/skiplist v1.2.1/go.mod h1:7v3iFjLcSAzO4fN5B8dvebvo/qsfumiLiDXMrPiHF9w=
-github.com/huandu/xstrings v1.4.0 h1:D17IlohoQq4UcpqD7fDk80P7l+lwAmlFaBHgOipl2FU=
-github.com/huandu/xstrings v1.4.0/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
 github.com/hudl/fargo v1.3.0/go.mod h1:y3CKSmjA+wD2gak7sUSXTAoopbhU08POFhmITJgmKTg=
 github.com/huin/goupnp v1.3.0 h1:UvLUlWDNpoUdYzb2TCn+MuTWtcjXKSza2n6CBdQ0xXc=
 github.com/huin/goupnp v1.3.0/go.mod h1:gnGPsThkYa7bFi/KWmEysQRf48l2dvR5bxr2OFckNX8=
@@ -627,8 +621,6 @@ github.com/jessevdk/go-flags v0.0.0-20141203071132-1679536dcc89/go.mod h1:4FA24M
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jhump/protoreflect v1.17.0 h1:qOEr613fac2lOuTgWN4tPAtLL7fUSbuJL5X5XumQh94=
 github.com/jhump/protoreflect v1.17.0/go.mod h1:h9+vUUL38jiBzck8ck+6G/aeMX8Z4QUY/NiJPwPNi+8=
-github.com/jinzhu/copier v0.4.0 h1:w3ciUoD19shMCRargcpm0cm91ytaBhDvuRpz1ODO/U8=
-github.com/jinzhu/copier v0.4.0/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
 github.com/jmhodges/levigo v1.0.0 h1:q5EC36kV79HWeTBWsod3mG11EgStG3qArTKcvlksN1U=
 github.com/jmhodges/levigo v1.0.0/go.mod h1:Q6Qx+uH3RAqyK4rFQroq9RL7mdkABMcfhEI+nNuzMJQ=
@@ -725,6 +717,8 @@ github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyua
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/mitchellh/pointerstructure v1.2.0 h1:O+i9nHnXS3l/9Wu7r4NrEdwA2VFTicjUEN1uBnDo34A=
 github.com/mitchellh/pointerstructure v1.2.0/go.mod h1:BRAsLI5zgXmw97Lf6s25bs8ohIXc3tViBH44KcwB2g4=
+github.com/mmsqe/cosmos-sdk v0.46.0-beta2.0.20251117111808-6aaa69ce93f3 h1:/QA3gFnuWLFihwNzVxvaE7GU9hhMH6PASvaLG5QdHu8=
+github.com/mmsqe/cosmos-sdk v0.46.0-beta2.0.20251117111808-6aaa69ce93f3/go.mod h1:VBGchDTNoLW3xNy5mPNlnDFZiEjgRN/06vwSkXuBQdg=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
@@ -985,8 +979,6 @@ github.com/urfave/cli v1.22.1 h1:+mkCCcOFKPnCmVYVcURKps1Xe+3zP90gSYGNfRkjoIY=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/urfave/cli/v2 v2.27.5 h1:WoHEJLdsXr6dDWoJgMq/CboDmyY/8HMMH1fTECbih+w=
 github.com/urfave/cli/v2 v2.27.5/go.mod h1:3Sevf16NykTbInEnD0yKkjDAeZDS0A6bzhBH5hrMvTQ=
-github.com/vektra/mockery/v2 v2.53.5 h1:iktAY68pNiMvLoHxKqlSNSv/1py0QF/17UGrrAMYDI8=
-github.com/vektra/mockery/v2 v2.53.5/go.mod h1:hIFFb3CvzPdDJJiU7J4zLRblUMv7OuezWsHPmswriwo=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 h1:gEOO8jv9F4OT7lGCjxCBTO/36wtF6j2nSip77qHd4x4=
 github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1/go.mod h1:Ohn+xnUBiLI6FVj/9LpzZWtj1/D6lUovWYBkxHVV3aM=
@@ -1097,8 +1089,6 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
-golang.org/x/mod v0.28.0 h1:gQBtGhjxykdjY9YhZpSlZIsbnaE2+PgjfLWUQTnoZ1U=
-golang.org/x/mod v0.28.0/go.mod h1:yfB/L0NOf/kmEbXjzCPOx1iK1fRutOydrCMsqRhEBxI=
 golang.org/x/net v0.0.0-20180719180050-a680a1efc54d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=

rpc/backend/account_info.go

@@ -33,7 +33,8 @@ func (b *Backend) GetCode(address common.Address, blockNrOrHash rpctypes.BlockNu
 		Address: address.String(),
 	}
 
-	res, err := b.QueryClient.Code(rpctypes.ContextWithHeight(blockNum.Int64()), req)
+	height := blockNum.Int64()
+	res, err := b.getGrpcClient(height).Code(rpctypes.ContextWithHeight(height), req)
 	if err != nil {
 		return nil, err
 	}
@@ -76,9 +77,10 @@ func (b *Backend) GetProof(address common.Address, storageKeys []string, blockNr
 	// query storage proofs
 	storageProofs := make([]rpctypes.StorageResult, len(storageKeys))
 
+	queryClient := b.getGrpcClient(height)
 	for i, key := range storageKeys {
 		hexKey := common.HexToHash(key)
-		valueBz, proof, err := b.QueryClient.GetProof(clientCtx, evmtypes.StoreKey, evmtypes.StateKey(address, hexKey.Bytes()))
+		valueBz, proof, err := queryClient.GetProof(clientCtx, evmtypes.StoreKey, evmtypes.StateKey(address, hexKey.Bytes()))
 		if err != nil {
 			return nil, err
 		}
@@ -95,14 +97,14 @@ func (b *Backend) GetProof(address common.Address, storageKeys []string, blockNr
 		Address: address.String(),
 	}
 
-	res, err := b.QueryClient.Account(ctx, req)
+	res, err := queryClient.Account(ctx, req)
 	if err != nil {
 		return nil, err
 	}
 
 	// query account proofs
 	accountKey := bytes.HexBytes(append(authtypes.AddressStoreKeyPrefix, address.Bytes()...))
-	_, proof, err := b.QueryClient.GetProof(clientCtx, authtypes.StoreKey, accountKey)
+	_, proof, err := queryClient.GetProof(clientCtx, authtypes.StoreKey, accountKey)
 	if err != nil {
 		return nil, err
 	}
@@ -135,7 +137,8 @@ func (b *Backend) GetStorageAt(address common.Address, key string, blockNrOrHash
 		Key:     key,
 	}
 
-	res, err := b.QueryClient.Storage(rpctypes.ContextWithHeight(blockNum.Int64()), req)
+	height := blockNum.Int64()
+	res, err := b.getGrpcClient(height).Storage(rpctypes.ContextWithHeight(height), req)
 	if err != nil {
 		return nil, err
 	}
@@ -160,7 +163,8 @@ func (b *Backend) GetBalance(address common.Address, blockNrOrHash rpctypes.Bloc
 		return nil, err
 	}
 
-	res, err := b.QueryClient.Balance(rpctypes.ContextWithHeight(blockNum.Int64()), req)
+	height := blockNum.Int64()
+	res, err := b.getGrpcClient(height).Balance(rpctypes.ContextWithHeight(height), req)
 	if err != nil {
 		return nil, err
 	}

rpc/backend/blocks.go

@@ -25,6 +25,7 @@ import (
 func (b *Backend) BlockNumber() (hexutil.Uint64, error) {
 	// do any grpc query, ignore the response and use the returned block height
 	var header metadata.MD
+	// use latest queryClient to get block height
 	_, err := b.QueryClient.Params(b.Ctx, &evmtypes.QueryParamsRequest{}, grpc.Header(&header))
 	if err != nil {
 		return hexutil.Uint64(0), err

rpc/backend/call_tx.go

@@ -357,7 +357,8 @@ func (b *Backend) EstimateGas(
 	// From ContextWithHeight: if the provided height is 0,
 	// it will return an empty context and the gRPC query will use
 	// the latest block height for querying.
-	res, err := b.QueryClient.EstimateGas(rpctypes.ContextWithHeight(blockNr.Int64()), &req)
+	height := blockNr.Int64()
+	res, err := b.getGrpcClient(height).EstimateGas(rpctypes.ContextWithHeight(height), &req)
 	if err != nil {
 		return 0, err
 	}
@@ -416,7 +417,7 @@ func (b *Backend) DoCall(
 	// this makes sure resources are cleaned up.
 	defer cancel()
 
-	res, err := b.QueryClient.EthCall(ctx, &req)
+	res, err := b.getGrpcClient(blockNr.Int64()).EthCall(ctx, &req)
 	if err != nil {
 		return nil, err
 	}

rpc/backend/chain_info.go

@@ -49,6 +49,7 @@ func (b *Backend) ChainConfig() *params.ChainConfig {
 
 // GlobalMinGasPrice returns MinGasPrice param from FeeMarket
 func (b *Backend) GlobalMinGasPrice() (*big.Int, error) {
+	// use latest queryClient to get GlobalMinGasPrice
 	res, err := b.QueryClient.GlobalMinGasPrice(b.Ctx, &evmtypes.QueryGlobalMinGasPriceRequest{})
 	if err != nil {
 		return nil, err
@@ -65,7 +66,8 @@ func (b *Backend) GlobalMinGasPrice() (*big.Int, error) {
 // return nil.
 func (b *Backend) BaseFee(blockRes *cmtrpctypes.ResultBlockResults) (*big.Int, error) {
 	// return BaseFee if London hard fork is activated and feemarket is enabled
-	res, err := b.QueryClient.BaseFee(rpctypes.ContextWithHeight(blockRes.Height), &evmtypes.QueryBaseFeeRequest{})
+	height := blockRes.Height
+	res, err := b.getGrpcClient(height).BaseFee(rpctypes.ContextWithHeight(height), &evmtypes.QueryBaseFeeRequest{})
 	if err != nil || res.BaseFee == nil {
 		// we can't tell if it's london HF not enabled or the state is pruned,
 		// in either case, we'll fallback to parsing from begin blocker event,
@@ -138,6 +140,7 @@ func (b *Backend) GetCoinbase() (sdk.AccAddress, error) {
 		ConsAddress: sdk.ConsAddress(status.ValidatorInfo.Address).String(),
 	}
 
+	// use latest queryClient to get coinbase
 	res, err := b.QueryClient.ValidatorAccount(b.Ctx, req)
 	if err != nil {
 		return nil, err
@@ -326,6 +329,7 @@ func (b *Backend) SuggestGasTipCap(baseFee *big.Int) (*big.Int, error) {
 		return big.NewInt(0), nil
 	}
 
+	// use latest queryClient to get params
 	params, err := b.QueryClient.FeeMarket.Params(b.Ctx, &feemarkettypes.QueryParamsRequest{})
 	if err != nil {
 		return nil, err

rpc/backend/comet_to_eth.go

@@ -202,6 +202,7 @@ func (b *Backend) MinerFromCometBlock(
 	var validatorAccAddr sdk.AccAddress
 
 	ctx := rpctypes.ContextWithHeight(cmtBlock.Height)
+	// use latest queryClient to get miner
 	res, err := b.QueryClient.ValidatorAccount(ctx, req)
 	if err != nil {
 		b.Logger.Debug(

rpc/backend/tracing.go

@@ -120,7 +120,7 @@ func (b *Backend) TraceTransaction(hash common.Hash, config *rpctypes.TraceConfi
 		// So here we set the minimum requested height to 1.
 		contextHeight = 1
 	}
-	traceResult, err := b.QueryClient.TraceTx(rpctypes.ContextWithHeight(contextHeight), &traceTxRequest)
+	traceResult, err := b.getGrpcClient(contextHeight).TraceTx(rpctypes.ContextWithHeight(contextHeight), &traceTxRequest)
 	if err != nil {
 		return nil, err
 	}
@@ -218,7 +218,7 @@ func (b *Backend) TraceBlock(height rpctypes.BlockNumber,
 		BlockMaxGas:     cp.ConsensusParams.Block.MaxGas,
 	}
 
-	res, err := b.QueryClient.TraceBlock(ctxWithHeight, traceBlockRequest)
+	res, err := b.getGrpcClient(int64(contextHeight)).TraceBlock(ctxWithHeight, traceBlockRequest)
 	if err != nil {
 		return nil, err
 	}
@@ -281,7 +281,7 @@ func (b *Backend) TraceCall(
 
 	// Use the block height as context for the query
 	ctxWithHeight := rpctypes.ContextWithHeight(contextHeight)
-	traceResult, err := b.QueryClient.TraceCall(ctxWithHeight, &traceCallRequest)
+	traceResult, err := b.getGrpcClient(contextHeight).TraceCall(ctxWithHeight, &traceCallRequest)
 	if err != nil {
 		return nil, err
 	}

rpc/backend/utils.go

@@ -26,6 +26,7 @@ import (
 	"cosmossdk.io/log"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/types/tx"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
 )
 
@@ -177,6 +178,7 @@ func (b *Backend) ProcessBlock(
 
 	if cfg.IsLondon(big.NewInt(blockHeight + 1)) {
 		ctx := types.ContextWithHeight(blockHeight)
+		// use latest queryClient to get params
 		params, err := b.QueryClient.FeeMarket.Params(ctx, &feemarkettypes.QueryParamsRequest{})
 		if err != nil {
 			return err
@@ -337,3 +339,17 @@ func GetHexProofs(proof *crypto.ProofOps) []string {
 	}
 	return proofs
 }
+
+// getGrpcClient returns a query client for the given height using SDK's connection routing
+func (b *Backend) getGrpcClient(height int64) *types.QueryClient {
+	// Use SDK's GRPCConnProvider to get the appropriate connection
+	grpcConn := b.ClientCtx.GetGRPCConn(height)
+	if grpcConn == nil {
+		return b.QueryClient
+	}
+	return &types.QueryClient{
+		ServiceClient: tx.NewServiceClient(grpcConn),
+		QueryClient:   evmtypes.NewQueryClient(grpcConn),
+		FeeMarket:     feemarkettypes.NewQueryClient(grpcConn),
+	}
+}

server/config/config.go

@@ -449,6 +449,11 @@ func GetConfig(v *viper.Viper) (Config, error) {
 	if err := v.Unmarshal(conf); err != nil {
 		return Config{}, fmt.Errorf("error extracting app config: %w", err)
 	}
+	sdkConf, err := config.GetConfig(v)
+	if err != nil {
+		return Config{}, err
+	}
+	conf.GRPC.BackupGRPCBlockAddressBlockRange = sdkConf.GRPC.BackupGRPCBlockAddressBlockRange
 	return *conf, nil
 }
 

server/start.go

@@ -676,6 +676,19 @@ func startGrpcServer(
 	clientCtx = clientCtx.WithGRPCClient(grpcClient)
 	svrCtx.Logger.Debug("gRPC client assigned to client context", "address", config.Address)
 
+	// Setup backup gRPC connections if configured
+	clientCtx, err = server.SetupBackupGRPCConnections(
+		clientCtx,
+		grpcClient,
+		config.BackupGRPCBlockAddressBlockRange,
+		maxRecvMsgSize,
+		maxSendMsgSize,
+		svrCtx.Logger,
+	)
+	if err != nil {
+		return nil, clientCtx, err
+	}
+
 	grpcSrv, err := servergrpc.NewGRPCServer(clientCtx, app, config)
 	if err != nil {
 		return nil, clientCtx, err