buchida is an email API platform designed specifically for AI agents and modern automation scenarios, with a focus on seamless support for Korean, Japanese, and Chinese (CJK) languages. The service aims to address the needs of developers and teams building agent-driven systems by providing a robust infrastructure for sending, managing, and testing email communications. It is currently available in public beta, offering a free tier with up to 3,000 emails per month and transparent pricing without requiring a credit card to get started.
Developers can interact with buchida through their preferred workflow, whether via terminal commands, code, or REST API calls. The CLI allows users to send, list, and debug emails directly from the terminal or within CI/CD pipelines and provides machine-readable JSON output as well as support for idempotency keys to handle retries safely. The MCP server enables integration with MCP-compatible clients, making it possible for agents to invoke email functionality directly.
buchida places significant emphasis on native CJK support. Its email templates utilize Noto Sans font stacks and proper UTF-8 encoding, ensuring correct rendering of Korean, Japanese, and Chinese characters. The platform ships with a library of built-in React Email components for common transactional flows such as verification, receipts, password resets, and onboarding, all designed with CJK compatibility as a core feature. The dashboard itself is fully localized in English, Korean, Japanese, and Chinese, allowing teams to use the platform in their preferred language for analytics, settings, billing, and documentation.
On the infrastructure side, buchida operates its own SMTP servers, avoiding third-party relay layers to maintain consistent deliverability and predictable behavior under load. The service implements soft caps on email quotas, providing warning notifications at 80% usage and allowing up to 120% of the quota on paid plans to prevent disruptions during traffic spikes. A test mode is available via special API keys, enabling safe experimentation and integration testing without sending real emails. These capabilities position buchida as a versatile email API solution tailored for AI-driven applications and multilingual teams.
buchida is an API design, testing & docs product. It focuses on simplifying programmatic access to email sending and management via a Python SDK for the buchida API. buchida is an open-source project aimed at developers. The project is open source (MIT). It runs on the web, the command line, and API.
It is developed by Vyblor, and the product first shipped in 2026. The project is developed in the open on GitHub with 12 commits in the last 90 days. Among its 4 catalogued features are Email API integration, Python SDK, and SMTP support. It exposes integrations via a public API.
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