diff --git a/.changeset/slow-cycles-perform.md b/.changeset/slow-cycles-perform.md
new file mode 100644
index 0000000000..b4f287878c
--- /dev/null
+++ b/.changeset/slow-cycles-perform.md
@@ -0,0 +1,5 @@
+---
+'@chainlink/tiingo-state-adapter': minor
+---
+
+Add adapter for Tiingo state.
diff --git a/.pnp.cjs b/.pnp.cjs
index ab72079703..c9f0dd9ef3 100644
--- a/.pnp.cjs
+++ b/.pnp.cjs
@@ -806,6 +806,10 @@ const RAW_RUNTIME_STATE =
       "name": "@chainlink/tiingo-adapter",\
       "reference": "workspace:packages/sources/tiingo"\
     },\
+    {\
+      "name": "@chainlink/tiingo-state-adapter",\
+      "reference": "workspace:packages/sources/tiingo-state"\
+    },\
     {\
       "name": "@chainlink/tp-adapter",\
       "reference": "workspace:packages/sources/tp"\
@@ -1105,6 +1109,7 @@ const RAW_RUNTIME_STATE =
     ["@chainlink/the-network-firm-adapter", ["workspace:packages/sources/the-network-firm"]],\
     ["@chainlink/therundown-adapter", ["workspace:packages/sources/therundown"]],\
     ["@chainlink/tiingo-adapter", ["workspace:packages/sources/tiingo"]],\
+    ["@chainlink/tiingo-state-adapter", ["workspace:packages/sources/tiingo-state"]],\
     ["@chainlink/token-allocation-adapter", ["workspace:packages/non-deployable/token-allocation"]],\
     ["@chainlink/token-allocation-test-adapter", ["workspace:packages/non-deployable/token-allocation-test"]],\
     ["@chainlink/tp-adapter", ["workspace:packages/sources/tp"]],\
@@ -9293,6 +9298,23 @@ const RAW_RUNTIME_STATE =
         "linkType": "SOFT"\
       }]\
     ]],\
+    ["@chainlink/tiingo-state-adapter", [\
+      ["workspace:packages/sources/tiingo-state", {\
+        "packageLocation": "./packages/sources/tiingo-state/",\
+        "packageDependencies": [\
+          ["@chainlink/tiingo-state-adapter", "workspace:packages/sources/tiingo-state"],\
+          ["@chainlink/external-adapter-framework", "npm:1.4.0"],\
+          ["@sinonjs/fake-timers", "npm:9.1.2"],\
+          ["@types/jest", "npm:27.5.2"],\
+          ["@types/node", "npm:16.11.68"],\
+          ["@types/sinonjs__fake-timers", "npm:8.1.5"],\
+          ["nock", "npm:13.5.4"],\
+          ["tslib", "npm:2.4.1"],\
+          ["typescript", "patch:typescript@npm%3A5.0.4#optional!builtin<compat/typescript>::version=5.0.4&hash=b5f058"]\
+        ],\
+        "linkType": "SOFT"\
+      }]\
+    ]],\
     ["@chainlink/token-allocation-adapter", [\
       ["workspace:packages/non-deployable/token-allocation", {\
         "packageLocation": "./packages/non-deployable/token-allocation/",\
diff --git a/packages/sources/tiingo-state/CHANGELOG.md b/packages/sources/tiingo-state/CHANGELOG.md
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/packages/sources/tiingo-state/README.md b/packages/sources/tiingo-state/README.md
new file mode 100644
index 0000000000..530dc5c012
--- /dev/null
+++ b/packages/sources/tiingo-state/README.md
@@ -0,0 +1,55 @@
+# TIINGO_STATE
+
+![0.0.1](https://img.shields.io/github/package-json/v/smartcontractkit/external-adapters-js?filename=packages/sources/tiingo-state/package.json) ![v3](https://img.shields.io/badge/framework%20version-v3-blueviolet)
+
+This document was generated automatically. Please see [README Generator](../../scripts#readme-generator) for more info.
+
+## Environment Variables
+
+| Required? |      Name       |          Description          |  Type  | Options |        Default         |
+| :-------: | :-------------: | :---------------------------: | :----: | :-----: | :--------------------: |
+|           | WS_API_ENDPOINT | websocket endpoint for tiingo | string |         | `wss://api.tiingo.com` |
+|    ✅     |     API_KEY     |      API key for tiingo       | string |         |                        |
+
+---
+
+## Data Provider Rate Limits
+
+There are no rate limits for this adapter.
+
+---
+
+## Input Parameters
+
+| Required? |   Name   |     Description     |  Type  |                                    Options                                    | Default |
+| :-------: | :------: | :-----------------: | :----: | :---------------------------------------------------------------------------: | :-----: |
+|           | endpoint | The endpoint to use | string | [crypto](#price-endpoint), [price](#price-endpoint), [state](#price-endpoint) | `price` |
+
+## Price Endpoint
+
+Supported names for this endpoint are: `crypto`, `price`, `state`.
+
+### Input Params
+
+| Required? | Name  |    Aliases     |                  Description                   |  Type  | Options | Default | Depends On | Not Valid With |
+| :-------: | :---: | :------------: | :--------------------------------------------: | :----: | :-----: | :-----: | :--------: | :------------: |
+|    ✅     | base  | `coin`, `from` | The symbol of symbols of the currency to query | string |         |         |            |                |
+|    ✅     | quote | `market`, `to` |    The symbol of the currency to convert to    | string |         |         |            |                |
+
+### Example
+
+Request:
+
+```json
+{
+  "data": {
+    "endpoint": "price",
+    "base": "wstETH",
+    "quote": "ETH"
+  }
+}
+```
+
+---
+
+MIT License
diff --git a/packages/sources/tiingo-state/package.json b/packages/sources/tiingo-state/package.json
new file mode 100644
index 0000000000..35a044edb5
--- /dev/null
+++ b/packages/sources/tiingo-state/package.json
@@ -0,0 +1,42 @@
+{
+  "name": "@chainlink/tiingo-state-adapter",
+  "version": "0.0.1",
+  "description": "Chainlink tiingo-state adapter.",
+  "keywords": [
+    "Chainlink",
+    "LINK",
+    "blockchain",
+    "oracle",
+    "tiingo-state"
+  ],
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist"
+  ],
+  "repository": {
+    "url": "https://github.com/smartcontractkit/external-adapters-js",
+    "type": "git"
+  },
+  "license": "MIT",
+  "scripts": {
+    "clean": "rm -rf dist && rm -f tsconfig.tsbuildinfo",
+    "prepack": "yarn build",
+    "build": "tsc -b",
+    "server": "node -e 'require(\"./index.js\").server()'",
+    "server:dist": "node -e 'require(\"./dist/index.js\").server()'",
+    "start": "yarn server:dist"
+  },
+  "devDependencies": {
+    "@sinonjs/fake-timers": "9.1.2",
+    "@types/jest": "27.5.2",
+    "@types/node": "16.11.68",
+    "@types/sinonjs__fake-timers": "8.1.5",
+    "nock": "13.5.4",
+    "typescript": "5.0.4"
+  },
+  "dependencies": {
+    "@chainlink/external-adapter-framework": "1.4.0",
+    "tslib": "2.4.1"
+  }
+}
diff --git a/packages/sources/tiingo-state/src/config/index.ts b/packages/sources/tiingo-state/src/config/index.ts
new file mode 100644
index 0000000000..58d0519949
--- /dev/null
+++ b/packages/sources/tiingo-state/src/config/index.ts
@@ -0,0 +1,23 @@
+import { AdapterConfig } from '@chainlink/external-adapter-framework/config'
+
+export const config = new AdapterConfig(
+  {
+    WS_API_ENDPOINT: {
+      description: 'websocket endpoint for tiingo',
+      default: 'wss://api.tiingo.com',
+      type: 'string',
+    },
+    API_KEY: {
+      description: 'API key for tiingo',
+      type: 'string',
+      required: true,
+      sensitive: true,
+    },
+  },
+  {
+    envDefaultOverrides: {
+      CACHE_MAX_AGE: 150_000, // see known issues in readme
+      WS_SUBSCRIPTION_TTL: 180_000,
+    },
+  },
+)
diff --git a/packages/sources/tiingo-state/src/endpoint/index.ts b/packages/sources/tiingo-state/src/endpoint/index.ts
new file mode 100644
index 0000000000..11a44912b4
--- /dev/null
+++ b/packages/sources/tiingo-state/src/endpoint/index.ts
@@ -0,0 +1 @@
+export { endpoint as price } from './price'
diff --git a/packages/sources/tiingo-state/src/endpoint/price.ts b/packages/sources/tiingo-state/src/endpoint/price.ts
new file mode 100644
index 0000000000..7dcd21579c
--- /dev/null
+++ b/packages/sources/tiingo-state/src/endpoint/price.ts
@@ -0,0 +1,30 @@
+import {
+  PriceEndpoint,
+  priceEndpointInputParametersDefinition,
+} from '@chainlink/external-adapter-framework/adapter'
+import { InputParameters } from '@chainlink/external-adapter-framework/validation'
+import { SingleNumberResultResponse } from '@chainlink/external-adapter-framework/util'
+import { TransportRoutes } from '@chainlink/external-adapter-framework/transports'
+import { wsTransport } from '../transport/price'
+import { config } from '../config'
+
+export const inputParameters = new InputParameters(priceEndpointInputParametersDefinition, [
+  {
+    base: 'wstETH',
+    quote: 'ETH',
+  },
+])
+
+export type BaseCryptoEndpointTypes = {
+  Parameters: typeof inputParameters.definition
+  Settings: typeof config.settings
+  Response: SingleNumberResultResponse
+}
+
+export const endpoint = new PriceEndpoint({
+  name: 'price',
+  aliases: ['crypto', 'state'],
+  transportRoutes: new TransportRoutes<BaseCryptoEndpointTypes>().register('ws', wsTransport),
+  defaultTransport: 'ws',
+  inputParameters: inputParameters,
+})
diff --git a/packages/sources/tiingo-state/src/index.ts b/packages/sources/tiingo-state/src/index.ts
new file mode 100644
index 0000000000..eb382e3831
--- /dev/null
+++ b/packages/sources/tiingo-state/src/index.ts
@@ -0,0 +1,13 @@
+import { expose, ServerInstance } from '@chainlink/external-adapter-framework'
+import { Adapter } from '@chainlink/external-adapter-framework/adapter'
+import { config } from './config'
+import { price } from './endpoint'
+
+export const adapter = new Adapter({
+  defaultEndpoint: price.name,
+  name: 'TIINGO_STATE',
+  config,
+  endpoints: [price],
+})
+
+export const server = (): Promise<ServerInstance | undefined> => expose(adapter)
diff --git a/packages/sources/tiingo-state/src/transport/price.ts b/packages/sources/tiingo-state/src/transport/price.ts
new file mode 100644
index 0000000000..a2deefa200
--- /dev/null
+++ b/packages/sources/tiingo-state/src/transport/price.ts
@@ -0,0 +1,63 @@
+import { WebSocketTransport } from '@chainlink/external-adapter-framework/transports'
+import { BaseCryptoEndpointTypes } from '../endpoint/price'
+
+interface Message {
+  service: string
+  messageType: string
+  data: [string, string, string, string, number]
+}
+
+const tickerIndex = 1
+const dateIndex = 2
+const priceIndex = 4
+
+type WsTransportTypes = BaseCryptoEndpointTypes & {
+  Provider: {
+    WsMessage: Message
+  }
+}
+
+export const wsTransport = new WebSocketTransport<WsTransportTypes>({
+  url: (context) => {
+    return `${context.adapterSettings.WS_API_ENDPOINT}/crypto-synth-state`
+  },
+  handlers: {
+    message(message) {
+      if (!message?.data?.length || message.messageType !== 'A' || !message.data[priceIndex]) {
+        return []
+      }
+      const [base, quote] = message.data[tickerIndex].split('/')
+      return [
+        {
+          params: { base, quote },
+          response: {
+            data: {
+              result: message.data[priceIndex],
+            },
+            result: message.data[priceIndex],
+            timestamps: {
+              providerIndicatedTimeUnixMs: new Date(message.data[dateIndex]).getTime(),
+            },
+          },
+        },
+      ]
+    },
+  },
+
+  builders: {
+    subscribeMessage: (params, context) => {
+      return {
+        eventName: 'subscribe',
+        authorization: context.adapterSettings.API_KEY,
+        eventData: { thresholdLevel: 8, tickers: [`${params.base}/${params.quote}`] },
+      }
+    },
+    unsubscribeMessage: (params, context) => {
+      return {
+        eventName: 'unsubscribe',
+        authorization: context.adapterSettings.API_KEY,
+        eventData: { thresholdLevel: 8, tickers: [`${params.base}/${params.quote}`] },
+      }
+    },
+  },
+})
diff --git a/packages/sources/tiingo-state/test-payload.json b/packages/sources/tiingo-state/test-payload.json
new file mode 100644
index 0000000000..51c1cfe424
--- /dev/null
+++ b/packages/sources/tiingo-state/test-payload.json
@@ -0,0 +1,6 @@
+{
+ "requests": [{
+  "from": "wstETH",
+  "to": "ETH"
+ }]
+}
diff --git a/packages/sources/tiingo-state/test/integration/__snapshots__/adapter.test.ts.snap b/packages/sources/tiingo-state/test/integration/__snapshots__/adapter.test.ts.snap
new file mode 100644
index 0000000000..bce77a9c37
--- /dev/null
+++ b/packages/sources/tiingo-state/test/integration/__snapshots__/adapter.test.ts.snap
@@ -0,0 +1,60 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`websocket crypto state endpoint should return error on empty base 1`] = `
+{
+  "error": {
+    "message": "[Param: base] param is required but no value was provided",
+    "name": "AdapterError",
+  },
+  "status": "errored",
+  "statusCode": 400,
+}
+`;
+
+exports[`websocket crypto state endpoint should return error on empty data 1`] = `
+{
+  "error": {
+    "message": "[Param: base] param is required but no value was provided",
+    "name": "AdapterError",
+  },
+  "status": "errored",
+  "statusCode": 400,
+}
+`;
+
+exports[`websocket crypto state endpoint should return error on empty quote 1`] = `
+{
+  "error": {
+    "message": "[Param: quote] param is required but no value was provided",
+    "name": "AdapterError",
+  },
+  "status": "errored",
+  "statusCode": 400,
+}
+`;
+
+exports[`websocket crypto state endpoint should return error on invalid pair 1`] = `
+{
+  "error": {
+    "message": "The EA has not received any values from the Data Provider for the requested data yet. Retry after a short delay, and if the problem persists raise this issue in the relevant channels.",
+    "name": "AdapterError",
+  },
+  "status": "errored",
+  "statusCode": 504,
+}
+`;
+
+exports[`websocket crypto state endpoint should return success 1`] = `
+{
+  "data": {
+    "result": 1.1807636997924935,
+  },
+  "result": 1.1807636997924935,
+  "statusCode": 200,
+  "timestamps": {
+    "providerDataReceivedUnixMs": 1018,
+    "providerDataStreamEstablishedUnixMs": 1010,
+    "providerIndicatedTimeUnixMs": 1646249828102,
+  },
+}
+`;
diff --git a/packages/sources/tiingo-state/test/integration/adapter.test.ts b/packages/sources/tiingo-state/test/integration/adapter.test.ts
new file mode 100644
index 0000000000..6893a7c19e
--- /dev/null
+++ b/packages/sources/tiingo-state/test/integration/adapter.test.ts
@@ -0,0 +1,79 @@
+import {
+  TestAdapter,
+  setEnvVariables,
+  mockWebSocketProvider,
+  MockWebsocketServer,
+} from '@chainlink/external-adapter-framework/util/testing-utils'
+import FakeTimers from '@sinonjs/fake-timers'
+import { mockWebsocketServer } from './fixtures'
+import { WebSocketClassProvider } from '@chainlink/external-adapter-framework/transports'
+
+describe('websocket', () => {
+  let mockWsServer: MockWebsocketServer | undefined
+  let testAdapter: TestAdapter
+  const wsEndpoint = 'ws://localhost:9090'
+  let oldEnv: NodeJS.ProcessEnv
+
+  const priceData = {
+    base: 'wsteth',
+    quote: 'eth',
+  }
+
+  beforeAll(async () => {
+    oldEnv = JSON.parse(JSON.stringify(process.env))
+    process.env['WS_API_ENDPOINT'] = wsEndpoint
+    process.env['API_KEY'] = 'fake-api-key'
+
+    // Start mock web socket server
+    mockWebSocketProvider(WebSocketClassProvider)
+    mockWsServer = mockWebsocketServer(wsEndpoint + '/crypto-synth-state')
+
+    const adapter = (await import('./../../src')).adapter
+    testAdapter = await TestAdapter.startWithMockedCache(adapter, {
+      clock: FakeTimers.install(),
+      testAdapter: {} as TestAdapter<never>,
+    })
+
+    // Send initial request to start background execute and wait for cache to be filled with results
+    await testAdapter.request(priceData)
+    await testAdapter.waitForCache(1)
+  })
+
+  afterAll(async () => {
+    setEnvVariables(oldEnv)
+    mockWsServer?.close()
+    testAdapter.clock?.uninstall()
+    await testAdapter.api.close()
+  })
+
+  describe('crypto state endpoint', () => {
+    it('should return success', async () => {
+      const response = await testAdapter.request(priceData)
+      expect(response.json()).toMatchSnapshot()
+    })
+
+    it('should return error on empty data', async () => {
+      const response = await testAdapter.request({})
+      expect(response.statusCode).toEqual(400)
+      expect(response.json()).toMatchSnapshot()
+    })
+
+    it('should return error on empty base', async () => {
+      const response = await testAdapter.request({ quote: 'ETH' })
+      expect(response.statusCode).toEqual(400)
+      expect(response.json()).toMatchSnapshot()
+    })
+
+    it('should return error on empty quote', async () => {
+      const response = await testAdapter.request({ base: 'wstETH' })
+      expect(response.statusCode).toEqual(400)
+      expect(response.json()).toMatchSnapshot()
+    })
+
+    it('should return error on invalid pair', async () => {
+      const response = await testAdapter.request({ base: 'ABC', quote: 'XYZ' })
+      expect(response.statusCode).toEqual(504)
+      expect(response.json()).toMatchSnapshot()
+    })
+  })
+})
diff --git a/packages/sources/tiingo-state/test/integration/fixtures.ts b/packages/sources/tiingo-state/test/integration/fixtures.ts
new file mode 100644
index 0000000000..5ffcf6c2bd
--- /dev/null
+++ b/packages/sources/tiingo-state/test/integration/fixtures.ts
@@ -0,0 +1,17 @@
+import { MockWebsocketServer } from '@chainlink/external-adapter-framework/util/testing-utils'
+
+export const mockWebsocketServer = (URL: string): MockWebsocketServer => {
+  const wsResponse = {
+    service: 'crypto_data',
+    messageType: 'A',
+    data: ['SA', 'wsteth/eth', '2022-03-02T19:37:08.102119+00:00', 'tiingo', 1.1807636997924935],
+  }
+  const mockWsServer = new MockWebsocketServer(URL, { mock: false })
+  mockWsServer.on('connection', (socket) => {
+    socket.on('message', () => {
+      socket.send(JSON.stringify(wsResponse))
+    })
+  })
+
+  return mockWsServer
+}
diff --git a/packages/sources/tiingo-state/tsconfig.json b/packages/sources/tiingo-state/tsconfig.json
new file mode 100644
index 0000000000..f59363fd76
--- /dev/null
+++ b/packages/sources/tiingo-state/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src"
+  },
+  "include": ["src/**/*", "src/**/*.json"],
+  "exclude": ["dist", "**/*.spec.ts", "**/*.test.ts"]
+}
diff --git a/packages/sources/tiingo-state/tsconfig.test.json b/packages/sources/tiingo-state/tsconfig.test.json
new file mode 100755
index 0000000000..e3de28cb5c
--- /dev/null
+++ b/packages/sources/tiingo-state/tsconfig.test.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "include": ["src/**/*", "**/test", "src/**/*.json"],
+  "compilerOptions": {
+    "noEmit": true
+  }
+}
diff --git a/packages/tsconfig.json b/packages/tsconfig.json
index 2a581c3bd0..2ea273296e 100644
--- a/packages/tsconfig.json
+++ b/packages/tsconfig.json
@@ -584,6 +584,9 @@
     {
       "path": "./sources/tiingo"
     },
+    {
+      "path": "./sources/tiingo-state"
+    },
     {
       "path": "./sources/tp"
     },
diff --git a/packages/tsconfig.test.json b/packages/tsconfig.test.json
index 62a6720870..3ce672da2f 100644
--- a/packages/tsconfig.test.json
+++ b/packages/tsconfig.test.json
@@ -584,6 +584,9 @@
     {
       "path": "./sources/tiingo/tsconfig.test.json"
     },
+    {
+      "path": "./sources/tiingo-state/tsconfig.test.json"
+    },
     {
       "path": "./sources/tp/tsconfig.test.json"
     },
diff --git a/yarn.lock b/yarn.lock
index e76d80a8c9..c4e62b9093 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6160,6 +6160,21 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@chainlink/tiingo-state-adapter@workspace:packages/sources/tiingo-state":
+  version: 0.0.0-use.local
+  resolution: "@chainlink/tiingo-state-adapter@workspace:packages/sources/tiingo-state"
+  dependencies:
+    "@chainlink/external-adapter-framework": "npm:1.4.0"
+    "@sinonjs/fake-timers": "npm:9.1.2"
+    "@types/jest": "npm:27.5.2"
+    "@types/node": "npm:16.11.68"
+    "@types/sinonjs__fake-timers": "npm:8.1.5"
+    nock: "npm:13.5.4"
+    tslib: "npm:2.4.1"
+    typescript: "npm:5.0.4"
+  languageName: unknown
+  linkType: soft
+
 "@chainlink/token-allocation-adapter@workspace:*, @chainlink/token-allocation-adapter@workspace:packages/non-deployable/token-allocation":
   version: 0.0.0-use.local
   resolution: "@chainlink/token-allocation-adapter@workspace:packages/non-deployable/token-allocation"