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Code that runs where messages happen.

Event-triggered functions with KV storage and the full API client in scope, deployed from the console, streaming logs live.

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Functions that live where messages happen.

WhatsApp-aware serverless functions on our edge: subscribe to any of 30+ events, a cron schedule, or plain HTTP. KV storage and the full API client are already in scope.

Auto-replies, voicemail handling, order lookups, daily digests, the glue code that usually needs a server, without the server.

Deploy from the console, watch logs stream live, or expose a function as an MCP tool so your agent can call it mid-conversation.

functions/on-message.tsdeployed

export default onMessage(async (msg, wa) => {

const order = await kv.get(msg.text) // built-in KV

if (order) return wa.reply(msg, orderCard(order))

await wa.forward(msg, '+55 11 9…') // human handoff

})

12:01:14 message.received +55 550-0142

12:01:14 kv.get 2 ms · hit

12:01:15 reply sent 187 ms total

Eventsmessage.received → auto-reply

Cron0 9 * * * → daily digest

HTTPPOST /fn/order-lookup

Agent toolsexposed over MCP

Deep dive

The glue code, hosted.

Most WhatsApp code is twenty lines that must run at the right moment: an auto-reply, a lookup, a digest. Running a server for that is overhead.

Functions run those twenty lines on our edge, with the API client and a KV store already in scope, deployed from the console.

30+
event triggers

<50ms
cold start

0
servers to run

How it works

Ship a function.

From trigger to live logs in one sitting.

Pick a triggerAny of 30+ events, a cron schedule, plain HTTP, or exposure as an MCP tool.

Write the handlerNode.js with wa.* and kv.* in scope; no SDK setup.

Deploy from the consoleLogs stream live; every invocation is replayable.

By the numbers

The runtime.

Small, fast, and WhatsApp-aware.

RuntimeNode.js at the edge

Triggers30+ events · cron · HTTP · MCP

StorageKV per project

Cold startunder 50 ms

Logslive stream + replay

Ship a WhatsApp integration this afternoon.

Free on the sandbox. No credit card. The projects you start here migrate straight into production.

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