Blynk Cloud Device HTTPS API

Name: Blynk Cloud Device HTTPS API API
Brand: Blynk Cloud Device HTTPS API
Availability: InStock

★ Only Publicly Available SpecIOTDevice ManagementapiKey6 EndpointsREST

For Agents

Read and write Blynk datastream values, log device events, and check hardware connectivity for IoT devices on Blynk Cloud.

Quickstart

Get started with Blynk Cloud Device HTTPS API in minutes using your preferred integration method.

# Add to your MCP client config (Claude Desktop, Cursor, Windsurf)
{
  "jentic": {
    "url": "https://api.jentic.com/mcp",
    "auth": "oauth"
  }
}

# Then ask your agent:
"read the current value of a Blynk datastream"

# → Jentic returns the GET /events tool with parameter schema, agent executes.

Capabilities

What an agent can do with Blynk Cloud Device HTTPS API API.

Read the current value of a datastream by virtual pin name

Write a single datastream value to update device state

Update multiple datastreams at once with the batch endpoint

Log a custom named event against a device with optional description

GET STARTED

Start building with Blynk Cloud Device HTTPS API API

Explore with Jentic

View OpenAPI Spec

Jentic publishes the only available OpenAPI specification for Blynk Cloud Device HTTPS API, keeping it validated and agent-ready.

Jentic publishes the only available OpenAPI specification for Blynk Cloud Device HTTPS API, keeping it validated and agent-ready. Blynk is an IoT platform with mobile and web dashboards, and the Device HTTPS API lets external systems read and write datastream values, log custom events, query historical data, and check whether a hardware device is currently online. Datastreams are the named virtual pins (V0, V1, etc.) that hardware writes to and dashboards read from. Authentication is per-device — each call carries a token query parameter scoped to a single Blynk device.

Use Cases

Patterns agents use Blynk Cloud Device HTTPS API API for, with concrete tasks.

★ Remote device control from a backend

Control a Blynk-connected device (relay, motor, light, plug) from a backend service or workflow engine without going through the Blynk mobile app. GET /update with the token, the datastream pin name, and the value triggers the device to act on the new value the next time it polls. GET /batch/update accepts multiple pin/value pairs in one call. Suitable for home automation hooks, scheduled actuator triggers, and remote support tools.

Call GET /update?token={token}&V0=1 to turn on a relay wired to virtual pin V0 on the target device.

Sensor data collection

Pull current and historical sensor values from devices reporting into Blynk for analytics or dashboards outside Blynk. GET /get returns the current value of a datastream, and GET /data returns the historical series with a configurable time window. Useful when an external time-series database, Grafana board, or analytics warehouse is the system of record.

Call GET /data?token={token}&dataStream=V1&period=1d to pull the last 24 hours of temperature readings from datastream V1.

Connectivity health check

Detect dropouts by checking whether a Blynk device is currently connected to the cloud. GET /isHardwareConnected returns a simple boolean for the device the token belongs to. Combine with /logEvent to record an event when a watchdog detects a sustained dropout, useful for fleet ops dashboards and alerting pipelines.

Call GET /isHardwareConnected?token={token} and, if false, call GET /logEvent?token={token}&code=offline_alert to record the dropout.

AI agent IoT command assistant

Let an AI agent take simple actions against Blynk-connected hardware on behalf of a user — turning a plug on or off, setting a thermostat target, or pulling a sensor reading. The agent searches Jentic for the right Blynk operation by intent, loads the schema, and executes with the device token held in the Jentic vault. Suitable for voice-driven smart home assistants and chat-based IoT control prototypes.

Search Jentic for 'turn on a Blynk device', load the schema for GET /update, and execute it with token and V0=1 to turn the device on.

Key Endpoints

6 endpoints — jentic publishes the only available openapi specification for blynk cloud device https api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

GET

/get

Read the current value of a datastream

GET

/update

Update a single datastream value

GET

/batch/update

Update multiple datastreams in one call

GET

/data

Pull historical datastream values

GET

/logEvent

Log a custom event against the device

GET

/isHardwareConnected

Check whether the device is online

GET

/get

Read the current value of a datastream

GET

/update

Update a single datastream value

GET

/batch/update

Update multiple datastreams in one call

GET

/data

Pull historical datastream values

GET

/logEvent

Log a custom event against the device

Why though Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Blynk per-device tokens are stored encrypted in the Jentic vault. Agents receive scoped execution access; tokens are bound to a single device, so a compromised execution context cannot enumerate or actuate other devices.

Intent-based discovery

Agents search by intent (e.g. 'read a Blynk datastream' or 'turn on a Blynk device') and Jentic returns the matching operation across the 6 endpoints with its input schema, so the agent can call the right path without browsing the docs.

Time to first call

Direct integration: half a day to wire datastream pin names, batch updates, and history pulls. Through Jentic: under 15 minutes — search, load, execute.

Related APIs

Alternatives and complements available in the Jentic catalogue.

Alternative

Blues Notehub API

Cellular IoT platform with fleet management — heavier-weight than Blynk for Wi-Fi/BLE prosumer devices

Choose Blues when devices are cellular Notecards needing fleet-level configuration; choose Blynk for hobbyist Wi-Fi/BLE hardware with a mobile dashboard

Alternative

Blues Notehub API

Sister Blues listing — broader IoT management for cellular fleets

Choose Blues.io for cellular Notecard deployments with firmware OTA needs; choose Blynk for simple datastream control

Complementary

Blockchain Data API

Pair when IoT devices should react to confirmed Bitcoin transactions

Use when an agent reads a Bitcoin payment confirmation from Blockchain.com and triggers a Blynk device action

FAQs

Specific to using Blynk Cloud Device HTTPS API API through Jentic.

Why is there no official OpenAPI spec for Blynk Cloud Device HTTPS API?

Blynk publishes a developer documentation site but does not distribute a maintained OpenAPI 3 file. Jentic generates and maintains this spec so AI agents and developers can call the Blynk Device HTTPS API via standard tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.

What authentication does the Blynk Device HTTPS API use?

Each call requires a device-scoped token passed as a query parameter (?token=...). The token is generated when a device is provisioned in Blynk and is unique per device. Through Jentic, the token is stored in the encrypted vault and injected at execution time, so the agent never handles the raw value, and per-device tokens stay isolated.

Can I write to multiple datastreams in one call?

Yes. GET /batch/update accepts multiple pin=value pairs in the query string (for example V0=1&V1=22.5&V2=on) so you can update several datastreams in a single request. This is more efficient than issuing repeated /update calls when several values change at once.

What are the rate limits for the Blynk Device HTTPS API?

Blynk applies per-device and per-account rate limits not enumerated in the spec. The published guidance is to keep request volume modest (a few requests per second per device); HTTP 429 responses come back when the limit is exceeded. Heavier ingestion should use Blynk's MQTT interface instead.

How do I read historical data through Jentic?

Search Jentic for 'pull Blynk datastream history', load the schema for GET /data, and execute it with the token, dataStream pin name, and a period (1h, 1d, 1w, 1m). Install with pip install jentic and call await client.execute(ExecutionRequest(...)). The response is a time-series array.

Can I check whether a device is online?

Yes. GET /isHardwareConnected with the device token returns a boolean indicating current connectivity to Blynk Cloud. This is suitable for liveness checks, watchdog scripts, and dashboard indicators.

Is the Blynk Cloud API free?

Blynk offers a free developer plan with limits on devices, datastream count, and history retention. Paid plans (Maker, Pro, Business) raise these limits and add features like white-label apps and on-prem deployment. The HTTPS API itself does not carry an additional fee.