Viber Chatbot API
Allows bots to send and receive messages on Viber, a messaging platform dominant in Eastern Europe and the Middle East, supporting text, images, carousels, keyboard buttons, and rich media.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HTTPS mandatory for webhooks. Bot token is a static secret with no rotation mechanism documented. Webhook signature validation available but not always enforced by default in community SDKs.
⚡ Reliability
Best When
Your target audience is in Bulgaria, Ukraine, Belarus, or other Eastern European/Middle Eastern markets where Viber is the dominant messaging app.
Avoid When
Your users are primarily in markets dominated by WhatsApp, LINE, or WeChat.
Use Cases
- • Send transactional notifications (order updates, appointment confirmations) to Viber users in Eastern Europe
- • Build an interactive customer support bot with custom keyboard buttons for menu-driven conversations
- • Deliver rich media messages with images and action buttons for e-commerce product promotions
- • Receive and process user messages including files, locations, and contacts shared via Viber
- • Track message delivery and open status via delivered/seen callbacks for engagement analytics
Not For
- • Reaching users in North America, Western Europe, or Asia where Viber has low adoption
- • Bot-to-bot messaging or automated account creation at scale
- • Bulk broadcasting without users having subscribed or initiated contact first
Interface
Authentication
Authentication uses a bot authentication token issued when the bot account is created. Token is passed as X-Viber-Auth-Token header. Webhook payloads include a signature for verification.
Pricing
The public chatbot API is free. Bulk business messaging (Viber BSP) requires a commercial agreement with Rakuten Viber or an authorized BSP.
Agent Metadata
Known Gotchas
- ⚠ Webhook endpoint MUST use HTTPS with a valid certificate — self-signed certs are rejected, blocking all incoming events
- ⚠ Bots can only send messages to users who have subscribed (sent the bot a message first); cold-outreach is not possible
- ⚠ Account info (account_id) is required in every message payload; missing this field causes silent failures in some SDK versions
- ⚠ No idempotency support — network retries will deliver duplicate messages to users
- ⚠ Viber's developer portal and documentation have historically lagged behind API changes, causing undocumented behavior
Alternatives
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Scores are editorial opinions as of 2026-03-06.