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WAFST - REST API that sends SMS through your own Android phone SIM, plus WhatsApp and email

I built this one, so disclosing that up front. Where it came from: in Egypt and the Gulf, sending OTPs and order updates through international SMS providers gets expensive fast. But a lot of small shops already have a phone with a cheap local SIM bundle sitting in a drawer. So I made an Android relay app. You install it, pair it with the API, and outgoing SMS go out through the phone's own SIM instead of a carrier route. Dual SIM works round robin, and the second SIM is the failover. Once

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痛点：埃及/海湾地区中小商家通过国际SMS服务商发OTP和订单通知成本高昂，而手边闲置的便宜本地SIM卡资源却无法被程序化调用。

目标用户：中东/北非地区的中小电商与本地商家、需要低成本发送OTP/订单通知的开发者，以及想用自有手机号做多通道触达的小团队。

证据：in Egypt and the Gulf, sending OTPs and order updates through international SMS providers gets expensive fast. But a lot of small shops already have a phone with a cheap local SIM bundle sitting in a drawer.

变现：SaaS订阅制（按发送条数/绑定设备数/通道数分级），48小时免卡试用转付费；可叠加白标API与企业私有部署。

MVP：两周内做一个最小可用版：Android relay App（单SIM发送SMS）+ 一个REST API端点 + 简易用量计费与API Key管理，先只验证'本地SIM发OTP'这一条链路，WhatsApp/邮件延后。

竞品：Twilio、Vonage、开源的Android SMS Gateway类项目、Textbelt、SMS Gateway API、本地化SMS聚合商

摘要：作者自建了WAFST：一个把短信通过自有Android手机SIM发出、并统一封装WhatsApp与邮件通道的REST API，瞄准埃及和海湾地区国际SMS费用高昂的中小商家。产品已有免费试用和定价页，并强调并发锁在数据库行级实现以保证多通道稳定，但帖中没有任何付费用户或收入数据，需求主要来自作者自身市场观察。概念不算新（Android短信网关已存在），但多通道+WhatsApp慢速养号的一体化封装有一定差异化空间。