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New , AI voice agents

APIs for every conversation.

Messaging, voice, email, and verification, built for developers. Ship in minutes, scale to billions, on infrastructure you can trust. Replace this with the client's real value proposition.

Start building freeTalk to sales

No credit card required. Free trial credit to start.

send-message.ts
import { Relayline } from "relayline";

const relay = new Relayline(process.env.RELAY_KEY);

// Send a message in three lines
await relay.messages.send({
  to:   "+1 555 0100",
  from: "+1 555 0199",
  body: "Your verification code is 4821",
});

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The Platform

One platform, every channel.

Build with the channels your customers already use. Mix and match with a single account, one set of credentials, and usage-based pricing.

Building with the API

Built for developers

From first call to production, fast.

  • Clean, predictable APIs

    REST and webhooks that behave the way you expect, with helpful errors.

  • SDKs in your language

    Idiomatic libraries and copy-paste quickstarts get you live in minutes.

  • Scales with you

    From your first test message to billions in production, on global infrastructure.

Read the docs
99.95%API uptime SLA
180+Countries reached
10B+Messages / month
~5 minTo first API call

Sample figures , replace with the client's verified metrics before launch.

Developer Resources

Everything you need to ship.

Quickstarts

Copy-paste guides to your first message, call, or OTP in minutes.

API reference

Every endpoint, parameter, and response, with live examples.

SDKs

Idiomatic libraries for Node, Python, Go, Ruby, Java, and more.

Status & changelog

Real-time platform status and a transparent changelog.

Start building in minutes.

Create a free account, grab your API key, and send your first message today. Replace with the client's real call to action.

Start building freeTalk to sales