diff --git a/docs/classes/default.md b/docs/classes/default.md
index 4367b731..6dd54202 100644
--- a/docs/classes/default.md
+++ b/docs/classes/default.md
@@ -33,14 +33,13 @@
 
 ### constructor
 
-• **new default**(`apiKey?`, `endpoint?`)
+• **new default**(`apiKeyOrOptions?`)
 
 #### Parameters
 
 | Name | Type |
 | :------ | :------ |
-| `apiKey?` | `string` |
-| `endpoint` | `string` |
+| `apiKeyOrOptions?` | `string` \| [`SeamClientOptions`](../interfaces/SeamClientOptions.md) |
 
 #### Overrides
 
@@ -48,7 +47,7 @@ Routes.constructor
 
 #### Defined in
 
-[src/index.ts:9](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L9)
+[src/index.ts:38](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L38)
 
 ## Properties
 
@@ -100,7 +99,7 @@ ___
 
 #### Defined in
 
-[src/index.ts:7](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L7)
+[src/index.ts:36](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L36)
 
 ___
 
@@ -239,4 +238,4 @@ Routes.makeRequest
 
 #### Defined in
 
-[src/index.ts:33](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L33)
+[src/index.ts:68](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L68)
diff --git a/docs/interfaces/SeamClientOptions.md b/docs/interfaces/SeamClientOptions.md
new file mode 100644
index 00000000..7f093a70
--- /dev/null
+++ b/docs/interfaces/SeamClientOptions.md
@@ -0,0 +1,46 @@
+[seamapi](../README.md) / [Exports](../modules.md) / SeamClientOptions
+
+# Interface: SeamClientOptions
+
+## Table of contents
+
+### Properties
+
+- [apiKey](SeamClientOptions.md#apikey)
+- [endpoint](SeamClientOptions.md#endpoint)
+- [workspaceId](SeamClientOptions.md#workspaceid)
+
+## Properties
+
+### apiKey
+
+• `Optional` **apiKey**: `string`
+
+#### Defined in
+
+[src/index.ts:8](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L8)
+
+___
+
+### endpoint
+
+• `Optional` **endpoint**: `string`
+
+Seam Endpoint to use, defaults to https://connect.getseam.com
+
+#### Defined in
+
+[src/index.ts:12](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L12)
+
+___
+
+### workspaceId
+
+• `Optional` **workspaceId**: `string`
+
+Workspace if using session authentication, defaults to SEAM_WORKSPACE_ID
+or undefined
+
+#### Defined in
+
+[src/index.ts:17](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L17)
diff --git a/docs/modules.md b/docs/modules.md
index d5595d0a..4e0473fb 100644
--- a/docs/modules.md
+++ b/docs/modules.md
@@ -43,6 +43,7 @@
 - [OngoingAccessCode](interfaces/OngoingAccessCode.md)
 - [PendingActionAttempt](interfaces/PendingActionAttempt.md)
 - [SeamAPIErrorMetadata](interfaces/SeamAPIErrorMetadata.md)
+- [SeamClientOptions](interfaces/SeamClientOptions.md)
 - [SuccessfulActionAttempt](interfaces/SuccessfulActionAttempt.md)
 - [TimeBoundAccessCode](interfaces/TimeBoundAccessCode.md)
 - [Workspace](interfaces/Workspace.md)
@@ -66,6 +67,10 @@
 - [NoiseDetectionDeviceType](modules.md#noisedetectiondevicetype)
 - [SuccessfulAPIResponse](modules.md#successfulapiresponse)
 
+### Functions
+
+- [getSeamClientOptionsWithDefaults](modules.md#getseamclientoptionswithdefaults)
+
 ## Type aliases
 
 ### APIResponse
@@ -220,3 +225,23 @@ ___
 #### Defined in
 
 [src/types/globals.ts:7](https://github.com/seamapi/seamapi-javascript/blob/main/src/types/globals.ts#L7)
+
+## Functions
+
+### getSeamClientOptionsWithDefaults
+
+▸ **getSeamClientOptionsWithDefaults**(`apiKeyOrOptions?`): [`SeamClientOptions`](interfaces/SeamClientOptions.md)
+
+#### Parameters
+
+| Name | Type |
+| :------ | :------ |
+| `apiKeyOrOptions?` | `string` \| [`SeamClientOptions`](interfaces/SeamClientOptions.md) |
+
+#### Returns
+
+[`SeamClientOptions`](interfaces/SeamClientOptions.md)
+
+#### Defined in
+
+[src/index.ts:20](https://github.com/seamapi/seamapi-javascript/blob/main/src/index.ts#L20)
diff --git a/package.json b/package.json
index e1073a9e..9fac8066 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,7 @@
     "axios": "0.25.0",
     "change-case": "4.1.2",
     "eventemitter3": "4.0.7",
+    "lodash": "^4.17.21",
     "node-inspect-extracted": "1.1.0",
     "ora": "5.4.1",
     "p-retry": "4.6.1",
@@ -50,6 +51,7 @@
     "@semantic-release/npm": "9.0.0",
     "@semantic-release/release-notes-generator": "10.0.3",
     "@swc/core": "1.2.133",
+    "@types/lodash": "^4.14.179",
     "@types/node": "17.0.10",
     "@types/yargs": "17.0.8",
     "ajv": "8.9.0",
diff --git a/src/cli/browser.ts b/src/cli/browser.ts
index b1bb0f02..78d62a6c 100644
--- a/src/cli/browser.ts
+++ b/src/cli/browser.ts
@@ -4,6 +4,7 @@ import type Y from "yargs"
 import { Yargs } from "https://unpkg.com/yargs@16.0.0-alpha.3/browser.mjs"
 import EventEmitter from "eventemitter3"
 import TypedEmitter from "typed-emitter"
+import { getSeamClientOptionsWithDefaults, SeamClientOptions } from "../"
 
 const yargsInstance = Yargs() as ReturnType<typeof Y>
 
@@ -13,12 +14,14 @@ type CLIEvents = {
 
 class BrowserCLI extends (EventEmitter as unknown as new () => TypedEmitter<CLIEvents>) {
   private instance = getCLI(yargsInstance).scriptName("seam")
+  private seamClientOptions: SeamClientOptions
 
   /**
    * Use the Seam CLI in the browser!
    */
-  constructor(private apiKey?: string) {
+  constructor(apiKeyOrOptions?: string | SeamClientOptions) {
     super()
+    this.seamClientOptions = getSeamClientOptionsWithDefaults(apiKeyOrOptions)
     this.setUpShims()
   }
 
@@ -34,15 +37,21 @@ class BrowserCLI extends (EventEmitter as unknown as new () => TypedEmitter<CLIE
   async parse(input: string) {
     this.setUpShims()
 
-    const inputWithKey = input.includes("--api-key")
+    const { apiKey, endpoint, workspaceId } = this.seamClientOptions
+
+    input = input.includes("--api-key") ? input : `${input} --api-key ${apiKey}`
+    input = input.includes("--endpoint")
+      ? input
+      : `${input} --endpoint ${endpoint}`
+    input = input.includes("--workspace-id")
       ? input
-      : `${input} --api-key ${this.apiKey}`
+      : `${input} --workspace-id ${workspaceId}`
 
-    const inputWithKeyAndWithoutPrefix = inputWithKey.startsWith("seam ")
-      ? inputWithKey.replace("seam ", "")
-      : inputWithKey.startsWith("seamapi ")
-      ? inputWithKey.replace("seamapi ", "")
-      : inputWithKey
+    input = input.startsWith("seam ")
+      ? input.replace("seam ", "")
+      : input.startsWith("seamapi ")
+      ? input.replace("seamapi ", "")
+      : input
 
     await new Promise<void>((resolve, reject) => {
       // .parseAsync isn't available in v16, so we listen for the ending newline instead
@@ -55,7 +64,7 @@ class BrowserCLI extends (EventEmitter as unknown as new () => TypedEmitter<CLIE
       this.on("data", onData)
 
       this.instance.parse(
-        inputWithKeyAndWithoutPrefix,
+        input,
         (error: Error, _argv: any, output?: string) => {
           if (error) {
             this.removeListener("data", onData)
diff --git a/src/cli/lib/execute-command.ts b/src/cli/lib/execute-command.ts
index c7a4d931..da06f4f0 100644
--- a/src/cli/lib/execute-command.ts
+++ b/src/cli/lib/execute-command.ts
@@ -3,6 +3,7 @@ import { Get } from "type-fest"
 import { paramCase } from "change-case"
 import Seam, { SeamAPIError } from "../.."
 import { GlobalOptions } from "./global-options"
+import _ from "lodash"
 
 type ParametersByPath<Path extends string> = Parameters<
   Exclude<Get<Seam, Path>, Seam>
@@ -32,7 +33,16 @@ const executeCommand = async <MethodPath extends string>(
       .start()
   }
 
-  const seam = new Seam(executeArgs["api-key"])
+  const seam = new Seam(
+    _.omitBy(
+      {
+        apiKey: executeArgs["api-key"],
+        endpoint: executeArgs["endpoint"],
+        workspaceId: executeArgs["workspace-id"],
+      },
+      _.isUndefined
+    )
+  )
 
   let method: any = seam
   for (const path of methodName.split(".")) {
diff --git a/src/cli/lib/global-options.ts b/src/cli/lib/global-options.ts
index 3eaa76b3..a6d38ca5 100644
--- a/src/cli/lib/global-options.ts
+++ b/src/cli/lib/global-options.ts
@@ -15,7 +15,29 @@ export const getParserWithOptions = (yargsInstance: Argv) =>
       describe: "Output JSON",
       type: "boolean",
     })
-    .group(["api-key", "quiet", "json", "help", "version"], "Global Options:")
+    .option("endpoint", {
+      describe: "Seam API Endpoint (defaults to https://connect.getseam.com)",
+      hidden: true,
+      type: "string",
+    })
+    .option("workspace-id", {
+      describe:
+        "Workspace Id to perform action against (only if using session key auth)",
+      hidden: true,
+      type: "string",
+    })
+    .group(
+      [
+        "api-key",
+        "endpoint",
+        "workspace-id",
+        "quiet",
+        "json",
+        "help",
+        "version",
+      ],
+      "Global Options:"
+    )
 
 export type YargsWithGlobalOptions = ReturnType<typeof getParserWithOptions>
 type ExtractGeneric<T> = T extends Argv<infer X> ? X : never
diff --git a/src/index.ts b/src/index.ts
index 0cb00856..b26762ab 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,18 +3,50 @@ import { SeamAPIError } from "./lib/api-error"
 import { Routes } from "./routes"
 import { ErroredAPIResponse, SuccessfulAPIResponse } from "./types/globals"
 
+export interface SeamClientOptions {
+  /* Seam API Key */
+  apiKey?: string
+  /**
+   * Seam Endpoint to use, defaults to https://connect.getseam.com
+   **/
+  endpoint?: string
+  /**
+   * Workspace if using session authentication, defaults to SEAM_WORKSPACE_ID
+   * or undefined
+   **/
+  workspaceId?: string
+}
+
+export const getSeamClientOptionsWithDefaults = (
+  apiKeyOrOptions?: string | SeamClientOptions
+): SeamClientOptions => {
+  const seamClientDefaults: SeamClientOptions = {
+    apiKey: process?.env?.SEAM_API_KEY,
+    endpoint: process?.env?.SEAM_API_URL || "https://connect.getseam.com",
+    workspaceId: process?.env?.SEAM_WORKSPACE_ID,
+  }
+  if (typeof apiKeyOrOptions === "string") {
+    return { ...seamClientDefaults, apiKey: apiKeyOrOptions }
+  } else {
+    return { ...seamClientDefaults, ...apiKeyOrOptions }
+  }
+}
+
 class Seam extends Routes {
   private client: AxiosInstance
 
-  constructor(
-    apiKey?: string,
-    endpoint = process?.env?.SEAM_API_URL || "https://connect.getseam.com"
-  ) {
+  constructor(apiKeyOrOptions?: string | SeamClientOptions) {
     super()
 
-    if (!apiKey) {
-      apiKey = process.env.SEAM_API_KEY
-    }
+    const options = getSeamClientOptionsWithDefaults(apiKeyOrOptions)
+    const { apiKey, endpoint, workspaceId } = options
+
+    const isRegularAPIKey = apiKey?.startsWith("seam_")
+
+    if (isRegularAPIKey && workspaceId)
+      throw new Error(
+        "You can't use API Key Authentication AND specify a workspace. Your API Key only works for the workspace it was created in. To use Session Key Authentication with multi-workspace support, contact Seam support."
+      )
 
     if (!apiKey) {
       throw new Error(
@@ -26,6 +58,9 @@ class Seam extends Routes {
       baseURL: endpoint,
       headers: {
         Authorization: `Bearer ${apiKey}`,
+
+        // only needed for session key authentication
+        ...(!workspaceId ? {} : { "Seam-Workspace": workspaceId }),
       },
     })
   }
diff --git a/tests b/tests
index 2f23a39d..70adac60 160000
--- a/tests
+++ b/tests
@@ -1 +1 @@
-Subproject commit 2f23a39d9b8f8fa0fcd525bbbf720f6f03833078
+Subproject commit 70adac60f4fbe4172cc90bed5589dcc51689b0d8
diff --git a/yarn.lock b/yarn.lock
index b1d77aed..939e74d3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -417,6 +417,11 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.9.tgz#97edc9037ea0c38585320b28964dde3b39e4660d"
   integrity sha512-qcUXuemtEu+E5wZSJHNxUXeCZhAfXKQ41D+duX+VYPde7xyEVZci+/oXKJL13tnRs9lR2pr4fod59GT6/X1/yQ==
 
+"@types/lodash@^4.14.179":
+  version "4.14.179"
+  resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.179.tgz#490ec3288088c91295780237d2497a3aa9dfb5c5"
+  integrity sha512-uwc1x90yCKqGcIOAT6DwOSuxnrAbpkdPsUOZtwrXb4D/6wZs+6qG7QnIawDuZWg0sWpxl+ltIKCaLoMlna678w==
+
 "@types/minimatch@*":
   version "3.0.5"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.5.tgz#1001cc5e6a3704b83c236027e77f2f58ea010f40"