diff --git a/.changeset/relay-rate-limit-auth.md b/.changeset/relay-rate-limit-auth.md
new file mode 100644
index 00000000000..d8cdc0cf5ba
--- /dev/null
+++ b/.changeset/relay-rate-limit-auth.md
@@ -0,0 +1,5 @@
+---
+'@audius/sdk': patch
+---
+
+Add Authorization header and API identification to relay calls to support proper rate limiting
diff --git a/packages/sdk/src/sdk/createSdkWithServices.ts b/packages/sdk/src/sdk/createSdkWithServices.ts
index 0a6bfcb6c99..dc6b9797f4a 100644
--- a/packages/sdk/src/sdk/createSdkWithServices.ts
+++ b/packages/sdk/src/sdk/createSdkWithServices.ts
@@ -95,6 +95,7 @@ export const createSdkWithServices = (config: SdkConfig) => {
   let apiKey = 'apiKey' in config ? config.apiKey : undefined
   const appName = 'appName' in config ? config.appName : undefined
   const apiSecret = 'apiSecret' in config ? config.apiSecret : undefined
+  const bearerToken = 'bearerToken' in config ? config.bearerToken : undefined
 
   // Default apiKey to derived key from apiSecret if not provided
   if (apiSecret && !apiKey) {
@@ -102,7 +103,12 @@ export const createSdkWithServices = (config: SdkConfig) => {
   }
 
   // Initialize services
-  const services = initializeServices({ config, apiKey, apiSecret })
+  const services = initializeServices({
+    config,
+    apiKey,
+    apiSecret,
+    bearerToken
+  })
 
   // Warn if using private key in the browser
   if (apiSecret && isBrowser) {
@@ -145,11 +151,13 @@ export const createSdkWithServices = (config: SdkConfig) => {
 const initializeServices = ({
   config,
   apiKey,
-  apiSecret
+  apiSecret,
+  bearerToken
 }: {
   config: SdkConfig
   apiKey?: string
   apiSecret?: string
+  bearerToken?: string
 }) => {
   const servicesConfig =
     config.environment === 'development' ? developmentConfig : productionConfig
@@ -179,7 +187,11 @@ const initializeServices = ({
     new EntityManagerClient({
       ...getDefaultEntityManagerConfig(servicesConfig),
       audiusWalletClient,
-      logger
+      logger,
+      apiKey,
+      apiSecret,
+      bearerToken,
+      appName: 'appName' in config ? config.appName : undefined
     })
 
   const storage =
diff --git a/packages/sdk/src/sdk/services/EntityManager/EntityManagerClient.ts b/packages/sdk/src/sdk/services/EntityManager/EntityManagerClient.ts
index 4477b2616e2..efadb679b6b 100644
--- a/packages/sdk/src/sdk/services/EntityManager/EntityManagerClient.ts
+++ b/packages/sdk/src/sdk/services/EntityManager/EntityManagerClient.ts
@@ -40,6 +40,10 @@ export class EntityManagerClient implements EntityManagerService {
   private readonly chainId: number
   private readonly contractAddress: string
   private readonly endpoint: string
+  private readonly apiKey?: string
+  private readonly apiSecret?: string
+  private readonly bearerToken?: string
+  private readonly appName?: string
 
   constructor(config_: EntityManagerConfig) {
     const config = mergeConfigWithDefaults(
@@ -51,6 +55,10 @@ export class EntityManagerClient implements EntityManagerService {
     this.contractAddress = config.contractAddress
     this.logger = config.logger.createPrefixedLogger('[entity-manager]')
     this.endpoint = config.endpoint
+    this.apiKey = config.apiKey
+    this.apiSecret = config.apiSecret
+    this.bearerToken = config.bearerToken
+    this.appName = config.appName
   }
 
   /**
@@ -87,13 +95,28 @@ export class EntityManagerClient implements EntityManagerService {
     const [senderAddress] = await this.audiusWalletClient.getAddresses()
     const signature = await this.audiusWalletClient.signTypedData(typedData)
 
-    const url = `${this.endpoint}/relay`
+    const params = new URLSearchParams()
+    if (this.apiKey) params.set('api_key', this.apiKey)
+    if (this.appName) params.set('app_name', this.appName)
+    const qs = params.toString()
+    const url = `${this.endpoint}/relay${qs ? `?${qs}` : ''}`
     this.logger.info(`Making relay request to ${url}`)
+
+    const headers = new Headers({
+      'Content-Type': 'application/json'
+    })
+
+    // Add auth header for API identification and rate limiting
+    if (this.bearerToken) {
+      headers.set('Authorization', `Bearer ${this.bearerToken}`)
+    } else if (this.apiKey && this.apiSecret) {
+      const credentials = btoa(`${this.apiKey}:${this.apiSecret}`)
+      headers.set('Authorization', `Basic ${credentials}`)
+    }
+
     const response = await fetch(url, {
       method: 'POST',
-      headers: new Headers({
-        'Content-Type': 'application/json'
-      }),
+      headers,
       body: JSON.stringify({
         contractAddress: this.contractAddress,
         contractRegistryKey: 'EntityManager',
diff --git a/packages/sdk/src/sdk/services/EntityManager/types.ts b/packages/sdk/src/sdk/services/EntityManager/types.ts
index 54decce02c9..4a12cffecb8 100644
--- a/packages/sdk/src/sdk/services/EntityManager/types.ts
+++ b/packages/sdk/src/sdk/services/EntityManager/types.ts
@@ -26,6 +26,14 @@ export type EntityManagerConfigInternal = {
    * The endpoint to use for relays
    */
   endpoint: string
+  /** API key for relay calls */
+  apiKey?: string
+  /** API secret for relay calls */
+  apiSecret?: string
+  /** Bearer token for relay calls */
+  bearerToken?: string
+  /** App name for relay calls */
+  appName?: string
 }
 export type EntityManagerConfig = Partial<EntityManagerConfigInternal> & {
   audiusWalletClient: AudiusWalletClient