diff --git a/pkg/graphql/client.go b/pkg/graphql/client.go
index 1040b1bc..255c0951 100644
--- a/pkg/graphql/client.go
+++ b/pkg/graphql/client.go
@@ -36,6 +36,48 @@ type GetLogs struct {
 	Responses []LogResponse `json:"getLogs"`
 }
 
+type IPFSBlockResp struct {
+	Key  string `json:"key"`
+	Data string `json:"data"`
+}
+
+type EthTransactionCidResp struct {
+	Cid          string        `json:"cid"`
+	TxHash       string        `json:"txHash"`
+	Index        int32         `json:"index"`
+	Src          string        `json:"src"`
+	Dst          string        `json:"dst"`
+	BlockByMhKey IPFSBlockResp `json:"blockByMhKey"`
+}
+
+type EthTransactionCidsByHeaderIdResp struct {
+	Nodes []EthTransactionCidResp `json:"nodes"`
+}
+
+type EthHeaderCidResp struct {
+	Cid                          string                           `json:"cid"`
+	BlockNumber                  BigInt                           `json:"blockNumber"`
+	BlockHash                    string                           `json:"blockHash"`
+	ParentHash                   string                           `json:"parentHash"`
+	Timestamp                    BigInt                           `json:"timestamp"`
+	StateRoot                    string                           `json:"stateRoot"`
+	Td                           BigInt                           `json:"td"`
+	TxRoot                       string                           `json:"txRoot"`
+	ReceiptRoot                  string                           `json:"receiptRoot"`
+	UncleRoot                    string                           `json:"uncleRoot"`
+	Bloom                        string                           `json:"bloom"`
+	EthTransactionCidsByHeaderId EthTransactionCidsByHeaderIdResp `json:"ethTransactionCidsByHeaderId"`
+	BlockByMhKey                 IPFSBlockResp                    `json:"blockByMhKey"`
+}
+
+type AllEthHeaderCidsResp struct {
+	Nodes []EthHeaderCidResp `json:"nodes"`
+}
+
+type AllEthHeaderCids struct {
+	Response AllEthHeaderCidsResp `json:"allEthHeaderCids"`
+}
+
 type Client struct {
 	client *gqlclient.Client
 }
@@ -117,3 +159,67 @@ func (c *Client) GetStorageAt(ctx context.Context, hash common.Hash, address com
 	}
 	return &storageAt.Response, nil
 }
+
+func (c *Client) AllEthHeaderCids(ctx context.Context, condition EthHeaderCidCondition) (*AllEthHeaderCidsResp, error) {
+	var params string
+	if condition.BlockHash != nil {
+		params = fmt.Sprintf(`blockHash: "%s"`, *condition.BlockHash)
+	}
+	if condition.BlockNumber != nil {
+		params += fmt.Sprintf(`blockNumber: "%s"`, condition.BlockNumber.String())
+	}
+
+	getLogsQuery := fmt.Sprintf(`
+		query{
+			allEthHeaderCids(condition: { %s }) {
+				nodes {
+					cid
+					blockNumber
+					blockHash
+					parentHash
+					timestamp
+					stateRoot
+					td
+					txRoot
+					receiptRoot
+					uncleRoot
+					bloom
+					blockByMhKey {
+						key
+						data
+					}
+					ethTransactionCidsByHeaderId {
+						nodes {
+							cid
+							txHash
+							index
+							src
+							dst
+						}
+					}
+				}
+			}
+		}
+	`, params)
+
+	req := gqlclient.NewRequest(getLogsQuery)
+	req.Header.Set("Cache-Control", "no-cache")
+
+	var respData map[string]interface{}
+	err := c.client.Run(ctx, req, &respData)
+	if err != nil {
+		return nil, err
+	}
+
+	jsonStr, err := json.Marshal(respData)
+	if err != nil {
+		return nil, err
+	}
+
+	var allEthHeaderCids AllEthHeaderCids
+	err = json.Unmarshal(jsonStr, &allEthHeaderCids)
+	if err != nil {
+		return nil, err
+	}
+	return &allEthHeaderCids.Response, nil
+}
diff --git a/pkg/graphql/graphql_test.go b/pkg/graphql/graphql_test.go
index 50375b3a..031ddb70 100644
--- a/pkg/graphql/graphql_test.go
+++ b/pkg/graphql/graphql_test.go
@@ -20,6 +20,7 @@ import (
 	"context"
 	"fmt"
 	"math/big"
+	"strconv"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -30,6 +31,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/statediff"
+	"github.com/ethereum/go-ethereum/statediff/indexer/models"
 	sdtypes "github.com/ethereum/go-ethereum/statediff/types"
 	"github.com/jmoiron/sqlx"
 	. "github.com/onsi/ginkgo"
@@ -250,4 +252,101 @@ var _ = Describe("GraphQL", func() {
 			Expect(storageRes.Value).To(Equal(common.Hash{}))
 		})
 	})
+
+	Describe("allEthHeaderCids", func() {
+		It("Retrieves header_cids that matches the provided blockNumber", func() {
+			allEthHeaderCidsResp, err := client.AllEthHeaderCids(ctx, graphql.EthHeaderCidCondition{BlockNumber: new(graphql.BigInt).SetUint64(2)})
+			Expect(err).ToNot(HaveOccurred())
+
+			headerCIDs, txCIDs, err := backend.Retriever.RetrieveHeaderAndTxCIDsByBlockNumber(2)
+			Expect(err).ToNot(HaveOccurred())
+
+			// Begin tx
+			tx, err := backend.DB.Beginx()
+			Expect(err).ToNot(HaveOccurred())
+			defer func() {
+				if p := recover(); p != nil {
+					shared.Rollback(tx)
+					panic(p)
+				} else if err != nil {
+					shared.Rollback(tx)
+				} else {
+					err = tx.Commit()
+				}
+			}()
+
+			headerIPLDs, err := backend.Fetcher.FetchHeaders(tx, headerCIDs)
+			Expect(err).ToNot(HaveOccurred())
+
+			for idx, headerCID := range headerCIDs {
+				ethHeaderCid := allEthHeaderCidsResp.Nodes[idx]
+
+				compareEthHeaderCid(ethHeaderCid, headerCID, txCIDs[idx], headerIPLDs[idx])
+			}
+		})
+
+		It("Retrieves header_cids that matches the provided blockHash", func() {
+			blockHash := blocks[2].Hash().String()
+			allEthHeaderCidsResp, err := client.AllEthHeaderCids(ctx, graphql.EthHeaderCidCondition{BlockHash: &blockHash})
+			Expect(err).ToNot(HaveOccurred())
+
+			headerCID, txCIDs, err := backend.Retriever.RetrieveHeaderAndTxCIDsByBlockHash(blocks[2].Hash())
+			Expect(err).ToNot(HaveOccurred())
+
+			// Begin tx
+			tx, err := backend.DB.Beginx()
+			Expect(err).ToNot(HaveOccurred())
+			defer func() {
+				if p := recover(); p != nil {
+					shared.Rollback(tx)
+					panic(p)
+				} else if err != nil {
+					shared.Rollback(tx)
+				} else {
+					err = tx.Commit()
+				}
+			}()
+
+			headerIPLDs, err := backend.Fetcher.FetchHeaders(tx, []models.HeaderModel{headerCID})
+			Expect(err).ToNot(HaveOccurred())
+			Expect(len(allEthHeaderCidsResp.Nodes)).To(Equal(1))
+
+			Expect(len(allEthHeaderCidsResp.Nodes)).To(Equal(1))
+			ethHeaderCid := allEthHeaderCidsResp.Nodes[0]
+			compareEthHeaderCid(ethHeaderCid, headerCID, txCIDs, headerIPLDs[0])
+		})
+	})
 })
+
+func compareEthHeaderCid(ethHeaderCid graphql.EthHeaderCidResp, headerCID models.HeaderModel, txCIDs []models.TxModel, headerIPLD models.IPLDModel) {
+	blockNumber, err := strconv.ParseInt(headerCID.BlockNumber, 10, 64)
+	Expect(err).ToNot(HaveOccurred())
+
+	td, err := strconv.ParseInt(headerCID.TotalDifficulty, 10, 64)
+	Expect(err).ToNot(HaveOccurred())
+
+	Expect(ethHeaderCid.Cid).To(Equal(headerCID.CID))
+	Expect(ethHeaderCid.BlockNumber).To(Equal(*new(graphql.BigInt).SetUint64(uint64(blockNumber))))
+	Expect(ethHeaderCid.BlockHash).To(Equal(headerCID.BlockHash))
+	Expect(ethHeaderCid.ParentHash).To(Equal(headerCID.ParentHash))
+	Expect(ethHeaderCid.Timestamp).To(Equal(*new(graphql.BigInt).SetUint64(headerCID.Timestamp)))
+	Expect(ethHeaderCid.StateRoot).To(Equal(headerCID.StateRoot))
+	Expect(ethHeaderCid.Td).To(Equal(*new(graphql.BigInt).SetUint64(uint64(td))))
+	Expect(ethHeaderCid.TxRoot).To(Equal(headerCID.TxRoot))
+	Expect(ethHeaderCid.ReceiptRoot).To(Equal(headerCID.RctRoot))
+	Expect(ethHeaderCid.UncleRoot).To(Equal(headerCID.UncleRoot))
+	Expect(ethHeaderCid.Bloom).To(Equal(graphql.Bytes(headerCID.Bloom).String()))
+
+	for tIdx, txCID := range txCIDs {
+		ethTxCid := ethHeaderCid.EthTransactionCidsByHeaderId.Nodes[tIdx]
+
+		Expect(ethTxCid.Cid).To(Equal(txCID.CID))
+		Expect(ethTxCid.TxHash).To(Equal(txCID.TxHash))
+		Expect(ethTxCid.Index).To(Equal(int32(txCID.Index)))
+		Expect(ethTxCid.Src).To(Equal(txCID.Src))
+		Expect(ethTxCid.Dst).To(Equal(txCID.Dst))
+	}
+
+	Expect(ethHeaderCid.BlockByMhKey.Data).To(Equal(graphql.Bytes(headerIPLD.Data).String()))
+	Expect(ethHeaderCid.BlockByMhKey.Key).To(Equal(headerIPLD.Key))
+}