diff --git a/api/api.go b/api/api.go
index 78db1c6a..89d680d7 100644
--- a/api/api.go
+++ b/api/api.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/common/lru"
 	"github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/eth/filters"
@@ -89,6 +90,8 @@ type BlockChainAPI struct {
 	indexingResumedHeight uint64
 	rateLimiter           RateLimiter
 	collector             metrics.Collector
+
+	blockByNumberCache *lru.Cache[uint64, *ethTypes.Block]
 }
 
 func NewBlockChainAPI(
@@ -101,6 +104,7 @@ func NewBlockChainAPI(
 	rateLimiter RateLimiter,
 	collector metrics.Collector,
 	indexingResumedHeight uint64,
+	blockByNumberCacheSize int,
 ) *BlockChainAPI {
 	return &BlockChainAPI{
 		logger:                logger,
@@ -112,6 +116,7 @@ func NewBlockChainAPI(
 		indexingResumedHeight: indexingResumedHeight,
 		rateLimiter:           rateLimiter,
 		collector:             collector,
+		blockByNumberCache:    lru.NewCache[uint64, *ethTypes.Block](blockByNumberCacheSize),
 	}
 }
 
@@ -407,6 +412,10 @@ func (b *BlockChainAPI) GetBlockByNumber(
 		return handleError[*ethTypes.Block](err, l, b.collector)
 	}
 
+	if block, ok := b.blockByNumberCache.Get(height); ok {
+		return block, nil
+	}
+
 	block, err := b.blocks.GetByHeight(height)
 
 	if err != nil {
@@ -418,6 +427,8 @@ func (b *BlockChainAPI) GetBlockByNumber(
 		return handleError[*ethTypes.Block](err, l, b.collector)
 	}
 
+	_ = b.blockByNumberCache.Add(height, apiBlock)
+
 	return apiBlock, nil
 }
 
diff --git a/bootstrap/bootstrap.go b/bootstrap/bootstrap.go
index 3aa4a0ef..c220c41c 100644
--- a/bootstrap/bootstrap.go
+++ b/bootstrap/bootstrap.go
@@ -352,6 +352,7 @@ func (b *Bootstrap) StartAPIServer(ctx context.Context) error {
 		rateLimiter,
 		b.collector,
 		indexingResumedHeight,
+		b.config.BlockByNumberCacheSize,
 	)
 
 	streamAPI := api.NewStreamAPI(
diff --git a/cmd/run/cmd.go b/cmd/run/cmd.go
index e3b22cf1..4bedd242 100644
--- a/cmd/run/cmd.go
+++ b/cmd/run/cmd.go
@@ -300,6 +300,7 @@ func init() {
 	Cmd.Flags().BoolVar(&experimentalSealingVerificationEnabled, "experimental-sealing-verification-enabled", true, "Sets whether the gateway should use the experimental soft finality sealing verification feature. WARNING: This may result in indexing halts if events do not match. Use only if you know what you are doing.")
 	Cmd.Flags().DurationVar(&cfg.EOAActivityCacheTTL, "eoa-activity-cache-ttl", time.Second*10, "Time interval used to track EOA activity. Tx send more frequently than this interval will be batched. Useful only when batch transaction submission is enabled.")
 	Cmd.Flags().DurationVar(&cfg.RpcRequestTimeout, "rpc-request-timeout", time.Second*120, "Sets the maximum duration at which JSON-RPC requests should generate a response, before they timeout. The default is 120 seconds.")
+	Cmd.Flags().IntVar(&cfg.BlockByNumberCacheSize, "block-by-number-cache-size", 1000, "Number of block cache for getBlockByNumber API.")
 
 	err := Cmd.Flags().MarkDeprecated("init-cadence-height", "This flag is no longer necessary and will be removed in future version. The initial Cadence height is known for testnet/mainnet and this was only required for fresh deployments of EVM Gateway. Once the DB has been initialized, the latest index Cadence height will be used upon start-up.")
 	if err != nil {
diff --git a/config/config.go b/config/config.go
index 10694f0b..5ae03fa0 100644
--- a/config/config.go
+++ b/config/config.go
@@ -136,4 +136,6 @@ type Config struct {
 	// RpcRequestTimeout is the maximum duration at which JSON-RPC requests should generate
 	// a response, before they timeout.
 	RpcRequestTimeout time.Duration
+	// BlockByNumberCacheSize is the size of the block by number cache.
+	BlockByNumberCacheSize int
 }