Can I use ChatRail without AI?

Yes. Messaging, scheduling, webhooks and connection management work without AI. AI replies are optional and enabled per connection.

What happens when a WhatsApp number disconnects?

ChatRail emits a session.disconnected webhook, flags the connection and holds queued messages. The number can be re-paired by scanning a QR code.

How quickly can I start sending?

A developer can pair a number by QR code and send the first API request without a Business Manager application or message-template review.

NewMCP tools — operate your workspace from your agentMCP tools for AI agents

Context-aware
WhatsApp infrastructure
for developers.

Q: Can I cancel anytime?

Yes. There is no cancellation fee, access continues to the end of the paid period, and a first payment is fully refundable within 14 days.

Q: Do I need to install an SDK?

No. ChatRail uses JSON requests over HTTPS with bearer-token authentication, so any system capable of making an HTTP request can connect.

Q: Where does message data go?

Message logs are encrypted at rest and deleted automatically: after 7 days on the Sandbox and within 90 days on paid plans. AI replies are opt-in. When optional AI replies are enabled, the attached context and customer message are sent to the selected model provider.

Send, receive and auto-reply on WhatsApp from one REST API. No Meta approval, no per-message fees.

Start free See the API

Free Sandbox · 500 messages a month · no expiry · paid plans from $15/month

Uses WhatsApp Linked Devices, not Meta’s official API: no approval needed, but a session can drop and need re-pairing. How it works

Replies grounded in your data Per-recipient delivery state Failure reasons, not red dots Session monitoring & re-pair

Kesari StudioWhatsApp · linked number

via ChatRail

n8n

Temporal

Hasura

Supabase

Grafana

Sentry

Uptime Kuma

PostHog

Retool

Novu

Directus

LangChain

Start here

Connect, automate and respond

Connect your numbers, add relevant context and manage the workflow from one workspace.

Connect your numbers

One workspace. A clear view of every connection.

Explore the workspace ↗

Answer follow-up questions

AI uses the information attached to each alert.

See AI replies ↗

Use ChatRail from your editor

Check connections, deliveries and schedules through MCP.

See MCP tools ↗

The API

Send a message with one API call

REST over JSON with a bearer token. Nothing to install.
connection picks the number you're sending from.
Attach a context object and AI replies answer from it.
Signed webhooks with an idempotency key on every event.

www.chatrail.dev/v1 · bearer token, JSON in and out

Pair any WhatsApp number by QR No templates, no approval queue Text, media, documents, locations Multiple numbers, one workspace AI replies are optional

What ChatRail does

From your app to their phone, and back

Each message is checked, delivered, answered and reported back to your server. You decide what to send and who gets it; ChatRail takes care of getting it there.

Your app

ChatRail

Your customers

The whole round trip

Every message, accounted for.

0
sent: 0
delivered: 0
read: 0
replies back: 0
events to your server: 0
retries recovered

One API to send. One webhook to hear back. ChatRail handles the delivery in between.

ChatRail moves messages, it doesn’t mine them. Logs are encrypted at rest and deleted automatically, and AI replies are opt-in. How your data is handled

Your first message is about 10 minutes away. Free Sandbox, no card needed.

Start free Read the quickstart

How it works

Go live in four steps

Connect a number, send a message and start receiving replies.

Read the API docs View a working example

Pair a numberLinked device

Waiting for scan

1 Open WhatsApp on the phone that owns the number
2 Settings → Linked devices → Link a device
3 Scan this code. The phone keeps working as normal.

Session persists until the phone unlinks itlinked-device · session

POST https://www.chatrail.dev/v1/messages/text
// Authorization: Bearer $CHATRAIL_KEY
{ "connection": "kesari-studio",
  "to":         "919876500118",
  "body":       "Please confirm your cash-on-delivery order." }

202 Accepted  94ms
{ "id":          "019bf4c3-5a1e-7c02-9d4e-3f6a8b2c1d07",
  "status":      "queued",
  "accepted_at": "2026-09-13T10:22:04Z" }

No SDK — any HTTP client workscurl · fetch · requests

Your endpointPOST /hooks/kesari-studio

message.delivered 10:22:09

message.read 10:23:41

message.received 10:24:07

session.disconnected —

Signed with X-ChatRail-Signatureidempotency-key on every event

DeliveryThis week · 412 recipients

Delivered66

Failed8

+91 (98) •••-0118 read 10:23

+1 (310) •••-0907 delivered 10:22

Per recipient, not per batchexportable as CSV

Inside the workspace

One place to manage everything

Check connections, schedule recurring reminders, review deliveries and test your setup.

01Connections

01 — Connections

See which numbers are connected

Spot a disconnected number and pair it again before messages are missed.

One webhook URL per connection
Re-pair by QR without touching the others

Connections3 active

KSKesari Studio+91 (98) •••-0118 Connected

LFLekki Family Clinic+234 (803) •••-0907 Connected

CHColégio Horizonte+55 (11) •••-0042 Re-pair

02Scheduler

02 — Scheduler

Schedule messages

Set it once and ChatRail sends on time, every time — no cron job, no remembering.

Fixed, recurring or relative to a record — fee reminders on the 1st, appointment reminders the day before
Whether it's 20 customers or 4,000, each gets a personal message and a tracked delivery
Pause a schedule without deleting it

Scheduled4 active

Weekly digestFri 09:00412

Rent due notice1st, monthly64

Appointment reminder24h beforeauto

Restock alerton trigger—

03Log

03 — Message log

Find failed messages

See the message, its status and the reason it failed.

Searchable by number, status or connection
Failure reason, not just a red dot

2 of 1,590

08:58Invoice INV-9F24 is due on 30 Sept not_registered

08:41Your table is booked for 8:00 pm media_too_large

08:12Shipment CR-2048 cleared customs delivered

04Sandbox

04 — Sandbox

Test before going live

Send a test message and check the response before reaching customers.

Throwaway number, no production traffic
Replay any logged payload against it

POST /v1/messages/text
{ "connection": "sandbox",
  "to": "14155550118",
  "body": "Ping" }

202 Accepted  86ms
{ "id": "019bf4c3-81d2-7a44-b0c9-6e2f1a7d3b58",
  "status": "queued" }

Edit the body, then send

Optional layer

Let customers ask about any alert

Attach the data when you send. If the customer replies with a question, AI answers from that data, and only that data.

context · invoice_9F24 attached

{
  "invoice": "INV-9F24",
  "total": "PKR 185,000",
  "paid_to_date": "PKR 60,000",
  "due_date": "2026-09-30",
  "late_fee": "2% of the outstanding balance"
}

What happens if I pay after the 30th?

16:41

AI replyYou'd owe the Rs 125,000 still outstanding plus a 2% late fee, about Rs 2,500. Paying on or before 30 September avoids it.

16:41

Grounded in your dataIt sees the context you attach, nothing else.
Scoped and expiringOne thread, dropped after a window you set.
You approve firstDraft mode is the default: a human approves each reply.
No key needed10,000 replies a month on Core + AI, or bring your own.

Fits your stack

Connect the tools you already use

Use your preferred AI model and trigger messages from your app, store, CRM or automation tool.

Bring your own model

Use your own AI provider or ours. Pick a model per number.

Anthropic

OpenAI

Google Gemini

DeepSeek

◇ Any OpenAI-compatible endpoint

◇ Self-hosted — set your own base URL

Works with your existing stack

Your app sends the message; replies come back to your webhook. Save group photos to Drive or Dropbox.

Shopify

Stripe

HubSpot

Zendesk

Cal.com

Airtable

Sheets

Supabase

Make

n8n

Zapier

↗ anything that can POST

Manage ChatRail from your coding assistant

Use MCP to check connections, investigate failed deliveries and manage schedules without leaving your editor.

Claude Code · Cursor · Codex · VS Code · any MCP client

Your agent

Why did message 9F24 fail?Claude Code · Cursor · Codex

request

CHATRAILMCPAuthenticated workspace access

context + action

Live workspace

Connections3 live Delivery1 failed Message logPayload found Schedules4 active

✓

Cause found: recipient is not registered on WhatsApp.

Replay in sandbox →

Customer story

Northgate Signals runs its private alert desk on ChatRail.

A paying customer turns continuously monitored events into structured WhatsApp alerts—without asking its private group to watch another dashboard.

ChatRail and Northgate Signals collaboration, connected by the ChatRail magenta rail — Customer outcomeLess time spent checking alerts across systems—and a conversational way to understand the data behind client behaviour.

**2,400+**alerts delivered60 daysrunning62 / 62recent sends accepted24 msmedian API response

Northgate Signals is the privacy-safe name of a paying ChatRail customer. Identifying details and message data have been anonymised. The 62/62 acceptance rate and 24 ms median reflect one inspected provider log window, not end-to-end WhatsApp delivery.

Built so your number stays yours

Runaway loops stop 10 messages per person per 5 minutes, max
Refusals explain why the reason and the limit, in plain English
Disconnects hold messages queued, not dropped; re-pair by QR

Will my number get banned? →

Production

Built for what goes wrong in production

Retries, duplicates and dropped sessions are handled on our side, and documented so you can handle them on yours.

Signed webhooks. Every delivery carries an HMAC-SHA256 signature over a timestamp and the raw body, so you can reject forged or replayed requests. Verify a signature →
Each event has one id. It stays the same across every retry, so your handler can skip an event it has already processed. Prevent duplicates →
Webhook retries. Timeouts, 5xx, 408 and 429 responses are retried; other 4xx responses are treated as final. Webhook events →
Sends can be retried safely. Pass an Idempotency-Key and a retried request returns the original response instead of sending twice. API reference →
Dropped sessions recover or say so. A disconnected session retries on its own; one that can’t recover is marked for re-pairing, and queued messages are held, not dropped. Session recovery →
Live service checks. The status page checks the API (with its database and Redis), the dashboard and this site in real time. Platform status →

Pricing

Simple pricing per connected number.

Start free and upgrade when you are ready.

Founding priceSubscribe to any paid plan before 30 November 2026 and keep today’s price for 12 months.

Messaging

Sandbox

$0/ month

For testing and personal automations.

1 connected number
500 messages / month
50 AI replies a month to try
Basic API and webhooks
7-day message log

Start free

Messaging

Core

$15/ month

For production alerts and workflows.

1 connected number
Unlimited messaging, number-safety guardrails
Media, groups and scheduling
Retries, logs and session monitoring
50 AI replies a month to try

Start with Core

Recommended

Messaging + AI

Core + AI

$29/ month

For replies grounded in your alert data.

Everything in Core
10,000 AI replies a month, no API key needed
Context-aware replies
Expiring thread memory
MCP tools for your coding assistant

Start with Core + AI

Teams

Team

$79/ month

For agencies and multi-client workspaces.

5 connected numbers
Unlimited messaging, number-safety guardrails
50,000 AI replies a month, no API key needed
Per-client webhooks and credentials
Member access and priority support
MCP tools for your coding assistant

Start with Team

Extra number: $8/month · Bring your own model key for unlimited AI replies on Core + AI and Team.

Pay monthly by card, or prepay 3 or 12 months in crypto (12 for the price of 10): USDT, USDC or Bitcoin.

Put your WhatsApp messages on rails.

Your first message is about 10 minutes away. Start on the free Sandbox — no card needed. Pair a number, send from the API and get the reply at your webhook.

Founding priceUpgrade before 30 November 2026 and keep today’s price for 12 months.

Start free — no card Read the quickstart

FAQ

Common questions

Will my number get banned?+

Numbers get banned for behaviour: unsolicited bulk messages and people reporting you. Message people who expect to hear from you and a linked-device number behaves like any busy WhatsApp account. ChatRail refuses repeated sends to the same person (more than 10 in five minutes), which is the runaway-loop pattern that gets numbers reported. It can’t make cold outreach safe, and no provider can.

What does “unlimited messages” mean?+

Paid plans have no monthly message quota and no per-message fee. The only ceiling is number safety: the per-recipient limit above. The free Sandbox includes 500 messages a month.

Do I need my own AI key?+

No. Core + AI includes 10,000 AI replies a month and Team includes 50,000, running on ChatRail’s model. Add your own OpenAI-compatible or Anthropic key if you want a different model or uncapped replies.

Can I cancel anytime?+

Yes. Card plans are monthly, and 12 months prepaid in crypto costs the same as 10. There’s no cancellation fee, and you keep access until the end of the period you paid for. Your first payment is fully refundable within 14 days. See the refund policy.

Is this an official Meta integration?+

No. ChatRail connects as a linked device to a regular WhatsApp account rather than through Meta’s official WhatsApp Business Platform. That is what removes message templates and the approval queue. It also means a session can be disconnected, and your account stays subject to WhatsApp’s own policies — so ChatRail monitors session state and tells you the moment a number needs re-pairing.

Context-aware
WhatsApp infrastructure
for developers.

Connect, automate and respond

Connect your numbers

Answer follow-up questions

Use ChatRail from your editor

Send a message with one API call

From your app to their phone, and back

Every message, accounted for.

Go live in four steps

Pair a WhatsApp number

POST your first message

Receive replies as webhooks

Watch it land

One place to manage everything

See which numbers are connected

Schedule messages

Find failed messages

Test before going live

Let customers ask about any alert

Connect the tools you already use

Bring your own model

Works with your existing stack

Manage ChatRail from your coding assistant

Northgate Signals runs its private alert desk on ChatRail.

Built for what goes wrong in production

Simple pricing per connected number.

Sandbox

Core

Core + AI

Team

Put your WhatsApp messages on rails.

Common questions

Context-aware WhatsApp infrastructure for developers.

Connect, automate and respond

Connect your numbers

Answer follow-up questions

Use ChatRail from your editor

Send a message with one API call

From your app to their phone, and back

Go live in four steps

Pair a WhatsApp number

POST your first message

Receive replies as webhooks

Watch it land

One place to manage everything

See which numbers are connected

Schedule messages

Find failed messages

Test before going live

Let customers ask about any alert

Connect the tools you already use

Bring your own model

Works with your existing stack

Manage ChatRail from your coding assistant

Northgate Signals runs its private alert desk on ChatRail.

Built for what goes wrong in production

Simple pricing per connected number.

Sandbox

Core

Core + AI

Team

Put your WhatsApp messages on rails.

Common questions

Context-aware
WhatsApp infrastructure
for developers.