diff --git a/indexer/backend.go b/indexer/backend.go
index 632d8e3b..7315bcc7 100644
--- a/indexer/backend.go
+++ b/indexer/backend.go
@@ -3,6 +3,7 @@ package indexer
 import (
 	"context"
 	"errors"
+	"sync"
 
 	ethcommon "github.com/ethereum/go-ethereum/common"
 	"github.com/oasisprotocol/oasis-core/go/common"
@@ -12,6 +13,7 @@ import (
 	"github.com/oasisprotocol/oasis-core/go/common/quantity"
 	"github.com/oasisprotocol/oasis-core/go/roothash/api/block"
 	"github.com/oasisprotocol/oasis-sdk/client-sdk/go/client"
+	"github.com/oasisprotocol/oasis-sdk/client-sdk/go/modules/core"
 
 	"github.com/oasisprotocol/oasis-web3-gateway/db/model"
 	"github.com/oasisprotocol/oasis-web3-gateway/filters"
@@ -82,6 +84,7 @@ type Backend interface {
 		oasisBlock *block.Block,
 		txResults []*client.TransactionWithResults,
 		blockGasLimit uint64,
+		rtInfo *core.RuntimeInfoResponse,
 	) error
 
 	// Prune removes indexed data for rounds equal to or earlier than the passed round.
@@ -89,6 +92,9 @@ type Backend interface {
 
 	// SetObserver sets the intrusive backend observer.
 	SetObserver(BackendObserver)
+
+	// RuntimeInfo returns the runtime info.
+	RuntimeInfo() *core.RuntimeInfoResponse
 }
 
 // BlockData contains all per block indexed data.
@@ -113,7 +119,11 @@ type BackendObserver interface {
 }
 
 type indexBackend struct {
-	runtimeID     common.Namespace
+	runtimeID common.Namespace
+
+	rtInfoLock sync.RWMutex
+	rtInfo     *core.RuntimeInfoResponse
+
 	logger        *logging.Logger
 	storage       storage.Storage
 	blockNotifier *pubsub.Broker
@@ -130,7 +140,7 @@ func (ib *indexBackend) SetObserver(ob BackendObserver) {
 }
 
 // Index indexes oasis block.
-func (ib *indexBackend) Index(ctx context.Context, oasisBlock *block.Block, txResults []*client.TransactionWithResults, blockGasLimit uint64) error {
+func (ib *indexBackend) Index(ctx context.Context, oasisBlock *block.Block, txResults []*client.TransactionWithResults, blockGasLimit uint64, rtInfo *core.RuntimeInfoResponse) error {
 	round := oasisBlock.Header.Round
 
 	err := ib.StoreBlockData(ctx, oasisBlock, txResults, blockGasLimit)
@@ -138,6 +148,11 @@ func (ib *indexBackend) Index(ctx context.Context, oasisBlock *block.Block, txRe
 		ib.logger.Error("generateEthBlock failed", "err", err)
 		return err
 	}
+	if rtInfo != nil {
+		ib.rtInfoLock.Lock()
+		ib.rtInfo = rtInfo
+		ib.rtInfoLock.Unlock()
+	}
 
 	ib.logger.Info("indexed block", "round", round)
 
@@ -167,6 +182,12 @@ func (ib *indexBackend) Prune(ctx context.Context, round uint64) error {
 	})
 }
 
+func (ib *indexBackend) RuntimeInfo() *core.RuntimeInfoResponse {
+	ib.rtInfoLock.RLock()
+	defer ib.rtInfoLock.RUnlock()
+	return ib.rtInfo
+}
+
 func (ib *indexBackend) WatchBlocks(ctx context.Context, buffer int64) (<-chan *BlockData, pubsub.ClosableSubscription, error) {
 	typedCh := make(chan *BlockData)
 	sub := ib.blockNotifier.SubscribeBuffered(buffer)
diff --git a/indexer/backend_cache.go b/indexer/backend_cache.go
index aaa745f5..74b12475 100644
--- a/indexer/backend_cache.go
+++ b/indexer/backend_cache.go
@@ -12,6 +12,7 @@ import (
 	"github.com/oasisprotocol/oasis-core/go/common/pubsub"
 	"github.com/oasisprotocol/oasis-core/go/roothash/api/block"
 	"github.com/oasisprotocol/oasis-sdk/client-sdk/go/client"
+	"github.com/oasisprotocol/oasis-sdk/client-sdk/go/modules/core"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 
@@ -168,8 +169,9 @@ func (cb *cachingBackend) Index(
 	oasisBlock *block.Block,
 	txResults []*client.TransactionWithResults,
 	blockGasLimit uint64,
+	rtInfo *core.RuntimeInfoResponse,
 ) error {
-	return cb.inner.Index(ctx, oasisBlock, txResults, blockGasLimit)
+	return cb.inner.Index(ctx, oasisBlock, txResults, blockGasLimit, rtInfo)
 }
 
 func (cb *cachingBackend) Prune(
@@ -408,6 +410,10 @@ func (cb *cachingBackend) WatchBlocks(ctx context.Context, buffer int64) (<-chan
 	return cb.inner.WatchBlocks(ctx, buffer)
 }
 
+func (cb *cachingBackend) RuntimeInfo() *core.RuntimeInfoResponse {
+	return cb.inner.RuntimeInfo()
+}
+
 func (cb *cachingBackend) pruneCache(
 	blockNumber uint64,
 ) {
diff --git a/indexer/indexer.go b/indexer/indexer.go
index da481102..ad1f657a 100644
--- a/indexer/indexer.go
+++ b/indexer/indexer.go
@@ -53,8 +53,8 @@ type Service struct {
 	client  client.RuntimeClient
 	core    core.V1
 
-	queryBlockGasLimit bool
-	blockGasLimit      uint64
+	queryEpochParameters bool
+	blockGasLimit        uint64
 
 	ctx       context.Context
 	cancelCtx context.CancelFunc
@@ -77,7 +77,8 @@ func (s *Service) indexBlock(ctx context.Context, round uint64) error {
 		return fmt.Errorf("querying block: %w", err)
 	}
 
-	if s.blockGasLimit == 0 || s.queryBlockGasLimit {
+	var rtInfo *core.RuntimeInfoResponse
+	if s.blockGasLimit == 0 || s.queryEpochParameters {
 		// Query parameters for block gas limit.
 		var params *core.Parameters
 		params, err = s.core.Parameters(ctx, round)
@@ -85,6 +86,12 @@ func (s *Service) indexBlock(ctx context.Context, round uint64) error {
 			return fmt.Errorf("querying block parameters: %w", err)
 		}
 		s.blockGasLimit = params.MaxBatchGas
+
+		// Query runtime info.
+		rtInfo, err = s.core.RuntimeInfo(ctx)
+		if err != nil {
+			return fmt.Errorf("querying runtime info: %w", err)
+		}
 	}
 
 	txs, err := s.client.GetTransactionsWithResults(ctx, blk.Header.Round)
@@ -92,7 +99,7 @@ func (s *Service) indexBlock(ctx context.Context, round uint64) error {
 		return fmt.Errorf("querying transactions with results: %w", err)
 	}
 
-	err = s.backend.Index(ctx, blk, txs, s.blockGasLimit)
+	err = s.backend.Index(ctx, blk, txs, s.blockGasLimit, rtInfo)
 	if err != nil {
 		return fmt.Errorf("indexing block: %w", err)
 	}
@@ -100,11 +107,11 @@ func (s *Service) indexBlock(ctx context.Context, round uint64) error {
 
 	switch {
 	case blk.Header.HeaderType == block.EpochTransition:
-		// Epoch transition block, ensure block gas is queried on next normal round.
-		s.queryBlockGasLimit = true
-	case s.queryBlockGasLimit && blk.Header.HeaderType == block.Normal:
-		// Block gas was queried, no need to query it until next epoch.
-		s.queryBlockGasLimit = false
+		// Epoch transition block, ensure epoch parameters are queried on next normal round.
+		s.queryEpochParameters = true
+	case s.queryEpochParameters && blk.Header.HeaderType == block.Normal:
+		// Epoch parameters were queried in last block, no need to re-query until next epoch.
+		s.queryEpochParameters = false
 	default:
 	}
 
diff --git a/rpc/eth/api.go b/rpc/eth/api.go
index c497d4e8..745ee9a9 100644
--- a/rpc/eth/api.go
+++ b/rpc/eth/api.go
@@ -8,9 +8,7 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
-	"strings"
 
-	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
@@ -50,10 +48,6 @@ var (
 	estimateGasSigSpec = estimateGasDummySigSpec()
 )
 
-const (
-	revertErrorPrefix = "reverted: "
-)
-
 // API is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
 type API interface {
 	// GetBlockByNumber returns the block identified by number.
@@ -354,39 +348,6 @@ func (api *publicAPI) GetCode(ctx context.Context, address common.Address, block
 	return res, nil
 }
 
-type RevertError struct {
-	error
-	Reason string `json:"reason"`
-}
-
-// ErrorData returns the ABI encoded error reason.
-func (e *RevertError) ErrorData() interface{} {
-	return e.Reason
-}
-
-// NewRevertError returns an revert error with ABI encoded revert reason.
-func (api *publicAPI) NewRevertError(revertErr error) *RevertError {
-	// ABI encoded function.
-	abiReason := []byte{0x08, 0xc3, 0x79, 0xa0} // Keccak256("Error(string)")
-
-	// ABI encode the revert Reason string.
-	revertReason := strings.TrimPrefix(revertErr.Error(), revertErrorPrefix)
-	typ, _ := abi.NewType("string", "", nil)
-	unpacked, err := (abi.Arguments{{Type: typ}}).Pack(revertReason)
-	if err != nil {
-		api.Logger.Error("failed to encode revert error", "revert_reason", revertReason, "err", err)
-		return &RevertError{
-			error: revertErr,
-		}
-	}
-	abiReason = append(abiReason, unpacked...)
-
-	return &RevertError{
-		error:  revertErr,
-		Reason: hexutil.Encode(abiReason),
-	}
-}
-
 func (api *publicAPI) Call(ctx context.Context, args utils.TransactionArgs, blockNrOrHash ethrpc.BlockNumberOrHash, _ *utils.StateOverride) (hexutil.Bytes, error) {
 	logger := api.Logger.With("method", "eth_call", "block_or_hash", blockNrOrHash)
 	logger.Debug("request", "args", args)
@@ -438,13 +399,7 @@ func (api *publicAPI) Call(ctx context.Context, args utils.TransactionArgs, bloc
 		input,
 	)
 	if err != nil {
-		if strings.HasPrefix(err.Error(), revertErrorPrefix) {
-			revertErr := api.NewRevertError(err)
-			logger.Debug("failed to execute SimulateCall, reverted", "err", err, "reason", revertErr.Reason)
-			return nil, revertErr
-		}
-		logger.Debug("failed to execute SimulateCall", "err", err)
-		return nil, err
+		return nil, api.handleCallFailure(logger, err)
 	}
 
 	logger.Debug("response", "args", args, "resp", res)
diff --git a/rpc/eth/revert_errors.go b/rpc/eth/revert_errors.go
new file mode 100644
index 00000000..00102405
--- /dev/null
+++ b/rpc/eth/revert_errors.go
@@ -0,0 +1,66 @@
+package eth
+
+import (
+	"strings"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/oasisprotocol/oasis-core/go/common/logging"
+	"github.com/oasisprotocol/oasis-sdk/client-sdk/go/modules/evm"
+)
+
+const (
+	revertErrorPrefix = "reverted: "
+)
+
+type RevertErrorV1 struct {
+	error
+	Reason string `json:"reason"`
+}
+
+// ErrorData returns the ABI encoded error reason.
+func (e *RevertErrorV1) ErrorData() interface{} {
+	return e.Reason
+}
+
+func (api *publicAPI) newRevertErrorV1(revertErr error) *RevertErrorV1 {
+	// ABI encoded function.
+	abiReason := []byte{0x08, 0xc3, 0x79, 0xa0} // Keccak256("Error(string)")
+
+	// ABI encode the revert Reason string.
+	revertReason := strings.TrimPrefix(revertErr.Error(), revertErrorPrefix)
+	typ, _ := abi.NewType("string", "", nil)
+	unpacked, err := (abi.Arguments{{Type: typ}}).Pack(revertReason)
+	if err != nil {
+		api.Logger.Error("failed to encode revert error", "revert_reason", revertReason, "err", err)
+		return &RevertErrorV1{
+			error: revertErr,
+		}
+	}
+	abiReason = append(abiReason, unpacked...)
+
+	return &RevertErrorV1{
+		error:  revertErr,
+		Reason: hexutil.Encode(abiReason),
+	}
+}
+
+func (api *publicAPI) handleCallFailure(logger *logging.Logger, err error) error {
+	// In EVM module version 1 the SDK decoded and returned readable revert reasons.
+	// Since EVM version 2 the raw data is just base64 encoded and returned.
+	// Changed in https://github.com/oasisprotocol/oasis-sdk/pull/1479
+	rtInfo := api.backend.RuntimeInfo()
+	switch rtInfo.Modules[evm.ModuleName].Version {
+	case 1:
+		if strings.HasPrefix(err.Error(), revertErrorPrefix) {
+			revertErr := api.newRevertErrorV1(err)
+			logger.Debug("failed to execute SimulateCall, reverted", "err", err, "reason", revertErr.Reason)
+			return revertErr
+		}
+		logger.Debug("failed to execute SimulateCall", "err", err)
+		return err
+	default:
+		// EVM version 2 onward.
+		return err
+	}
+}