diff --git a/_examples/indexer/main.go b/_examples/indexer/main.go
new file mode 100644
index 00000000..02e0aebe
--- /dev/null
+++ b/_examples/indexer/main.go
@@ -0,0 +1,28 @@
+package main
+
+import (
+	"context"
+	"log"
+
+	"github.com/0xsequence/go-sequence/indexer"
+	"github.com/davecgh/go-spew/spew"
+)
+
+func main() {
+	seqIndexer := indexer.NewIndexer("https://polygon-indexer.sequence.app", "kzk9Hdk0EJRoj9qgHWncKtHAAAAAAAAA")
+
+	accountAddress := "0x8e3E38fe7367dd3b52D1e281E4e8400447C8d8B9"
+	includeMetadata := true
+	metadataOptions := indexer.MetadataOptions{
+		VerifiedOnly: true,
+	}
+
+	_, tokenBalances, err := seqIndexer.GetTokenBalances(context.Background(), &accountAddress, nil, nil, &includeMetadata, &metadataOptions, nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, tokenBalance := range tokenBalances {
+		spew.Dump(tokenBalance)
+	}
+}
diff --git a/_examples/metadata/main.go b/_examples/metadata/main.go
new file mode 100644
index 00000000..66fc7486
--- /dev/null
+++ b/_examples/metadata/main.go
@@ -0,0 +1,25 @@
+package main
+
+import (
+	"context"
+	"log"
+
+	"github.com/0xsequence/go-sequence/metadata"
+	"github.com/davecgh/go-spew/spew"
+)
+
+func main() {
+	seqMetadata := metadata.NewMetadata("kzk9Hdk0EJRoj9qgHWncKtHAAAAAAAAA")
+
+	contractInfo, err := seqMetadata.GetContractInfo(context.Background(), "polygon", "0x631998e91476DA5B870D741192fc5Cbc55F5a52E")
+	if err != nil {
+		log.Fatal(err)
+	}
+	spew.Dump(contractInfo)
+
+	collectibleInfo, err := seqMetadata.GetTokenMetadata(context.Background(), "polygon", "0x631998e91476DA5B870D741192fc5Cbc55F5a52E", []string{"1", "2"})
+	if err != nil {
+		log.Fatal(err)
+	}
+	spew.Dump(collectibleInfo)
+}
diff --git a/api/api.go b/api/api.go
new file mode 100644
index 00000000..4cbf179d
--- /dev/null
+++ b/api/api.go
@@ -0,0 +1,52 @@
+package api
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type Options struct {
+	HTTPClient    HTTPClient
+	JWTAuthToken  string
+	APIServiceURL string
+}
+
+func NewAPI(projectAccessKey string, options ...Options) API {
+	opts := Options{}
+	if len(options) > 0 {
+		opts = options[0]
+	}
+
+	client := &httpclient{
+		client:           opts.HTTPClient,
+		projectAccessKey: projectAccessKey,
+	}
+	if opts.HTTPClient == nil {
+		client.client = http.DefaultClient
+	}
+	if opts.JWTAuthToken != "" {
+		client.jwtAuthHeader = fmt.Sprintf("BEARER %s", opts.JWTAuthToken)
+	}
+
+	apiServiceURL := "https://api.sequence.app"
+	if opts.APIServiceURL != "" {
+		apiServiceURL = opts.APIServiceURL
+	}
+	return NewAPIClient(apiServiceURL, client)
+}
+
+type httpclient struct {
+	client           HTTPClient
+	jwtAuthHeader    string
+	projectAccessKey string
+}
+
+func (c *httpclient) Do(req *http.Request) (*http.Response, error) {
+	if c.projectAccessKey != "" {
+		req.Header.Set("X-Access-Key", c.projectAccessKey)
+	}
+	if c.jwtAuthHeader != "" {
+		req.Header.Set("Authorization", c.jwtAuthHeader)
+	}
+	return c.client.Do(req)
+}
diff --git a/indexer/indexer.go b/indexer/indexer.go
new file mode 100644
index 00000000..95da63ae
--- /dev/null
+++ b/indexer/indexer.go
@@ -0,0 +1,47 @@
+package indexer
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type Options struct {
+	HTTPClient   HTTPClient
+	JWTAuthToken string
+}
+
+func NewIndexer(indexerServiceURL string, projectAccessKey string, options ...Options) Indexer {
+	opts := Options{}
+	if len(options) > 0 {
+		opts = options[0]
+	}
+
+	client := &httpclient{
+		client:           opts.HTTPClient,
+		projectAccessKey: projectAccessKey,
+	}
+	if opts.HTTPClient == nil {
+		client.client = http.DefaultClient
+	}
+	if opts.JWTAuthToken != "" {
+		client.jwtAuthHeader = fmt.Sprintf("BEARER %s", opts.JWTAuthToken)
+	}
+
+	return NewIndexerClient(indexerServiceURL, client)
+}
+
+type httpclient struct {
+	client           HTTPClient
+	jwtAuthHeader    string
+	projectAccessKey string
+}
+
+func (c *httpclient) Do(req *http.Request) (*http.Response, error) {
+	if c.projectAccessKey != "" {
+		req.Header.Set("X-Access-Key", c.projectAccessKey)
+	}
+	if c.jwtAuthHeader != "" {
+		req.Header.Set("Authorization", c.jwtAuthHeader)
+	}
+	return c.client.Do(req)
+}
diff --git a/metadata/metadata.go b/metadata/metadata.go
new file mode 100644
index 00000000..a1a76630
--- /dev/null
+++ b/metadata/metadata.go
@@ -0,0 +1,52 @@
+package metadata
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type Options struct {
+	HTTPClient         HTTPClient
+	JWTAuthToken       string
+	MetadataServiceURL string
+}
+
+func NewMetadata(projectAccessKey string, options ...Options) Metadata {
+	opts := Options{}
+	if len(options) > 0 {
+		opts = options[0]
+	}
+
+	client := &httpclient{
+		client:           opts.HTTPClient,
+		projectAccessKey: projectAccessKey,
+	}
+	if opts.HTTPClient == nil {
+		client.client = http.DefaultClient
+	}
+	if opts.JWTAuthToken != "" {
+		client.jwtAuthHeader = fmt.Sprintf("BEARER %s", opts.JWTAuthToken)
+	}
+
+	metadataServiceURL := "https://metadata.sequence.app"
+	if opts.MetadataServiceURL != "" {
+		metadataServiceURL = opts.MetadataServiceURL
+	}
+	return NewMetadataClient(metadataServiceURL, client)
+}
+
+type httpclient struct {
+	client           HTTPClient
+	jwtAuthHeader    string
+	projectAccessKey string
+}
+
+func (c *httpclient) Do(req *http.Request) (*http.Response, error) {
+	if c.projectAccessKey != "" {
+		req.Header.Set("X-Access-Key", c.projectAccessKey)
+	}
+	if c.jwtAuthHeader != "" {
+		req.Header.Set("Authorization", c.jwtAuthHeader)
+	}
+	return c.client.Do(req)
+}
diff --git a/relayer/proto/relayer.go b/relayer/proto/relayer.go
new file mode 100644
index 00000000..fa604fe5
--- /dev/null
+++ b/relayer/proto/relayer.go
@@ -0,0 +1,47 @@
+package proto
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type Options struct {
+	HTTPClient   HTTPClient
+	JWTAuthToken string
+}
+
+func NewRelayer(relayerServiceURL string, projectAccessKey string, options ...Options) Relayer {
+	opts := Options{}
+	if len(options) > 0 {
+		opts = options[0]
+	}
+
+	client := &httpclient{
+		client:           opts.HTTPClient,
+		projectAccessKey: projectAccessKey,
+	}
+	if opts.HTTPClient == nil {
+		client.client = http.DefaultClient
+	}
+	if opts.JWTAuthToken != "" {
+		client.jwtAuthHeader = fmt.Sprintf("BEARER %s", opts.JWTAuthToken)
+	}
+
+	return NewRelayerClient(relayerServiceURL, client)
+}
+
+type httpclient struct {
+	client           HTTPClient
+	jwtAuthHeader    string
+	projectAccessKey string
+}
+
+func (c *httpclient) Do(req *http.Request) (*http.Response, error) {
+	if c.projectAccessKey != "" {
+		req.Header.Set("X-Access-Key", c.projectAccessKey)
+	}
+	if c.jwtAuthHeader != "" {
+		req.Header.Set("Authorization", c.jwtAuthHeader)
+	}
+	return c.client.Do(req)
+}