Offers WhatsApp Bot services for automation.

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Global BSPs (some with local presence or partners): Wati, AiSensy, Gallabox, Interakt, Twilio (API provider), Gupshup, Brevo (formerly Sendinblue), Respond.io, 360Dialog.
Pricing for Official Solutions:
These solutions typically use a conversation-based pricing model set by Meta, where you pay per 24-hour conversation session. The cost varies by conversation category (marketing, utility, authentication, and service) and region. BSPs often add their platform fees on top of Meta's charges.

2. Unofficial / "Bulk Sender" Software
These are third-party tools that often claim to send "unlimited" bulk WhatsApp messages without using the official API.

Key Characteristics and Risks:

Violates WhatsApp's Terms of Service: WhatsApp explicitly prohibits the use of unauthorized tools for bulk or automated messaging.
High Risk of Account Ban: Using such software can whatsapp number list lead to your WhatsApp account (personal or business) being permanently banned. WhatsApp has sophisticated anti-spam measures.
No Official Support: You won't get any support from WhatsApp or Meta if you encounter issues or get banned.
Privacy & Security Risks: These tools might compromise your data or your contacts' privacy.
Limited Features: They often lack the advanced features of API solutions, such as interactive messages, seamless CRM integration, or reliable analytics.
Ethical Concerns: Sending unsolicited messages is considered spam and can harm your brand reputation.
Examples (often marketed as "WhatsApp Bulk Sender," "WA Sender," "WhatsApp Marketing Software"):
You might find these advertised on places like Daraz (e.g., "WA sender, WhatsApp marketing software With 32 GB Usb Drive"). Be extremely cautious with such offerings.