There are several chatbot APIs that you can use for free without requiring payment or having watermarks. Here are some options that you may consider:
1. Dialogflow - This is a natural language understanding platform that allows you to build conversational interfaces for websites, mobile applications, and messaging platforms. Dialogflow offers a free tier that allows you to create and deploy chatbots with up to 1,000 requests per month. It also provides pre-built agents for common use cases like customer service, e-commerce, and travel.
2. Botpress - This is an open-source platform for creating and managing chatbots. Botpress offers a free version that includes basic features such as natural language processing, conversation flow management, and integration with messaging platforms like Facebook Messenger and Slack.
3. Chatfuel - This is a chatbot builder that allows you to create Facebook Messenger bots without coding. Chatfuel offers a free plan that includes basic features like unlimited messages and a chatbot dashboard. It also provides a feature called "Quick Replies" that allows you to create automated responses that users can click on.
4. Tars - This is a chatbot builder that specializes in creating conversational landing pages and lead generation bots. Tars offers a free trial that allows you to create and deploy a chatbot on your website for 14 days. It also provides a feature called "File Uploads" that allows you to attach files to chatbot responses.
5. Flow XO - This is a platform for building chatbots and workflows for messaging platforms and websites. Flow XO offers a free plan that includes basic features like 500 interactions per month and integration with messaging platforms like Facebook Messenger, Slack, and Telegram. It also provides a feature called "Buttons and Cards" that allows you to create clickable responses for your chatbot.
All of these chatbot APIs have features that allow you to create automated responses for FAQs and other common queries. They also provide the ability to attach files and chat with clients. You can evaluate each of these options to determine which one best fits your needs.
