Unified Messaging API · v3

Customer communications, delivered by one API.

Relaywire is a developer-first cloud platform for SMS, voice, and notifications — built for the reliability, scale, and observability that modern teams depend on.

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No credit card required · Test credits included

send_message.sh

# Send a message in a single call
curl https://api.relaywire.io/v3/messages \
  -H "Authorization: Bearer $API_KEY" \
  -d to="+1 555 0142" \
  -d channel="sms" \
  -d body="Your verification code is 4827"

# → 202 Accepted  ·  id: msg_7Qa1c…

Platform

One platform for every channel

Built for developers, trusted by operations and security teams.

SMS & RCS

Two-way SMS and rich RCS messaging to 200+ countries with carrier-grade routing.

Voice & Verify

Programmable voice and OTP verification with automatic cross-channel fallback.

Push & Notifications

Unified web and mobile push with delivery tracking out of the box.

Developer-first APIs

Clean REST APIs, official SDKs, and webhooks. First message in minutes.

Realtime analytics

Live dashboards for delivery, latency, and spend across every channel.

Enterprise security

SOC 2 Type II, encryption in transit and at rest, and role-based access control.