diff --git a/indexer/indexer.go b/indexer/indexer.go
index 0b6f68f..15bdc02 100644
--- a/indexer/indexer.go
+++ b/indexer/indexer.go
@@ -746,7 +746,6 @@ func (i *Indexer) GetScriptPubKeys(
 
 // GetBlockLazy returns a *types.BlockResponse from the indexer's block storage.
 // All transactions in a block must be fetched individually.
-// TODO: replace with GetBlock
 func (i *Indexer) GetBlockLazy(
 	ctx context.Context,
 	blockIdentifier *types.PartialBlockIdentifier,
@@ -756,7 +755,6 @@ func (i *Indexer) GetBlockLazy(
 
 // GetBlockTransaction returns a *types.Transaction if it is in the provided
 // *types.BlockIdentifier.
-// TODO: remove method
 func (i *Indexer) GetBlockTransaction(
 	ctx context.Context,
 	blockIdentifier *types.BlockIdentifier,
diff --git a/rosetta-cli-conf/mainnet/config.json b/rosetta-cli-conf/mainnet/config.json
index 69c25a1..e700c91 100644
--- a/rosetta-cli-conf/mainnet/config.json
+++ b/rosetta-cli-conf/mainnet/config.json
@@ -11,6 +11,8 @@
  "max_sync_concurrency": 0,
  "tip_delay": 1800,
  "log_configuration": false,
+ "compression_disabled": true,
+ "memory_limit_disabled": true,
  "data": {
   "active_reconciliation_concurrency": 0,
   "inactive_reconciliation_concurrency": 0,
diff --git a/rosetta-cli-conf/testnet/config.json b/rosetta-cli-conf/testnet/config.json
index ea1b75d..cdd9b45 100644
--- a/rosetta-cli-conf/testnet/config.json
+++ b/rosetta-cli-conf/testnet/config.json
@@ -11,6 +11,8 @@
  "max_sync_concurrency": 0,
  "tip_delay": 1800,
  "log_configuration": false,
+ "compression_disabled": true,
+ "memory_limit_disabled": true,
  "construction": {
   "max_offline_connections": 0,
   "stale_depth": 0,
diff --git a/services/block_service.go b/services/block_service.go
index b837765..489da48 100644
--- a/services/block_service.go
+++ b/services/block_service.go
@@ -54,6 +54,12 @@ func (s *BlockAPIService) Block(
 		return nil, wrapErr(ErrBlockNotFound, err)
 	}
 
+	// Direct client to fetch transactions individually if
+	// more than inlineFetchLimit.
+	if len(blockResponse.OtherTransactions) > inlineFetchLimit {
+		return blockResponse, nil
+	}
+
 	txs := make([]*types.Transaction, len(blockResponse.OtherTransactions))
 	for i, otherTx := range blockResponse.OtherTransactions {
 		transaction, err := s.i.GetBlockTransaction(
@@ -78,5 +84,20 @@ func (s *BlockAPIService) BlockTransaction(
 	ctx context.Context,
 	request *types.BlockTransactionRequest,
 ) (*types.BlockTransactionResponse, *types.Error) {
-	return nil, ErrUnimplemented
+	if s.config.Mode != configuration.Online {
+		return nil, wrapErr(ErrUnavailableOffline, nil)
+	}
+
+	transaction, err := s.i.GetBlockTransaction(
+		ctx,
+		request.BlockIdentifier,
+		request.TransactionIdentifier,
+	)
+	if err != nil {
+		return nil, wrapErr(ErrTransactionNotFound, err)
+	}
+
+	return &types.BlockTransactionResponse{
+		Transaction: transaction,
+	}, nil
 }
diff --git a/services/block_service_test.go b/services/block_service_test.go
index 8f7787b..bdbf297 100644
--- a/services/block_service_test.go
+++ b/services/block_service_test.go
@@ -16,6 +16,7 @@ package services
 
 import (
 	"context"
+	"fmt"
 	"testing"
 
 	"github.com/coinbase/rosetta-bitcoin/configuration"
@@ -40,13 +41,13 @@ func TestBlockService_Offline(t *testing.T) {
 
 	blockTransaction, err := servicer.BlockTransaction(ctx, &types.BlockTransactionRequest{})
 	assert.Nil(t, blockTransaction)
-	assert.Equal(t, ErrUnimplemented.Code, err.Code)
-	assert.Equal(t, ErrUnimplemented.Message, err.Message)
+	assert.Equal(t, ErrUnavailableOffline.Code, err.Code)
+	assert.Equal(t, ErrUnavailableOffline.Message, err.Message)
 
 	mockIndexer.AssertExpectations(t)
 }
 
-func TestBlockService_Online(t *testing.T) {
+func TestBlockService_Online_Inline(t *testing.T) {
 	cfg := &configuration.Configuration{
 		Mode: configuration.Online,
 	}
@@ -146,3 +147,68 @@ func TestBlockService_Online(t *testing.T) {
 
 	mockIndexer.AssertExpectations(t)
 }
+
+func TestBlockService_Online_External(t *testing.T) {
+	cfg := &configuration.Configuration{
+		Mode: configuration.Online,
+	}
+	mockIndexer := &mocks.Indexer{}
+	servicer := NewBlockAPIService(cfg, mockIndexer)
+	ctx := context.Background()
+
+	blockResponse := &types.BlockResponse{
+		Block: &types.Block{
+			BlockIdentifier: &types.BlockIdentifier{
+				Index: 100,
+				Hash:  "block 100",
+			},
+		},
+	}
+
+	otherTxs := []*types.TransactionIdentifier{}
+	for i := 0; i < 200; i++ {
+		otherTxs = append(otherTxs, &types.TransactionIdentifier{
+			Hash: fmt.Sprintf("tx%d", i),
+		})
+	}
+	blockResponse.OtherTransactions = otherTxs
+
+	mockIndexer.On(
+		"GetBlockLazy",
+		ctx,
+		(*types.PartialBlockIdentifier)(nil),
+	).Return(
+		blockResponse,
+		nil,
+	).Once()
+	b, err := servicer.Block(ctx, &types.BlockRequest{})
+	assert.Nil(t, err)
+	assert.Equal(t, blockResponse, b)
+
+	for _, otherTx := range b.OtherTransactions {
+		tx := &types.Transaction{
+			TransactionIdentifier: otherTx,
+		}
+		mockIndexer.On(
+			"GetBlockTransaction",
+			ctx,
+			blockResponse.Block.BlockIdentifier,
+			otherTx,
+		).Return(
+			tx,
+			nil,
+		).Once()
+
+		bTx, err := servicer.BlockTransaction(ctx, &types.BlockTransactionRequest{
+			BlockIdentifier:       blockResponse.Block.BlockIdentifier,
+			TransactionIdentifier: otherTx,
+		})
+		assert.Nil(t, err)
+		assert.Equal(t, &types.BlockTransactionResponse{
+			Transaction: tx,
+		}, bTx)
+
+	}
+
+	mockIndexer.AssertExpectations(t)
+}
diff --git a/services/types.go b/services/types.go
index b753d39..e039dc9 100644
--- a/services/types.go
+++ b/services/types.go
@@ -30,6 +30,10 @@ const (
 	// HistoricalBalanceLookup indicates
 	// that historical balance lookup is supported.
 	HistoricalBalanceLookup = true
+
+	// inlineFetchLimit is the maximum number
+	// of transactions to fetch inline.
+	inlineFetchLimit = 100
 )
 
 var (