AI Agents Can Share Files Autonomously! LLM-Native Next-Generation File Transfer Service 'Quink' Released

ReplyData Inc. (Headquarters: Shinjuku-ku, Tokyo; Representative Director: Yusuke Miyauchi) is pleased to announce the release of 'Quink,' a next-generation file transfer service that smartly handles file transfer and sharing from AI agents (OpenAI, Anthropic, etc.), internal systems, and automation scripts with a single REST API. The service was released on July 8, 2026.

'Quink' makes manual upload tasks and complex development efforts a thing of the past, strongly supporting seamless data integration and enhanced security in the AI era, moving beyond PPAP.

URL: https://quink.jp/

Background of Development: Eliminating the 'Manual Upload' Bottleneck in the AI Era As LLMs (Large Language Models) and AI agents from companies like OpenAI and Anthropic become deeply integrated into corporate workflows, scenarios such as 'sharing documents and reports generated by AI externally' and 'transferring data automatically generated by systems to business partners' are rapidly increasing.

However, conventional file transfer services were designed with the assumption of manual drag-and-drop operations via a web browser, making them incompatible with AI and automation systems. Integrating file transfer functionality into one's own system from scratch incurred significant costs, including weeks of development time, maintenance of large-scale storage servers, and implementation of advanced encryption.

'Quink' was born to solve these challenges as an API-first, LLM-native file transfer service.

3 Major Features of 'Quink'

1. [AI Agent Integration] Automate File Transfers with Simple Instructions (Supports llms.txt) Quink comes pre-equipped with 'llms.txt,' a standard specification for AI to understand website specifications. This allows AI agents from companies like OpenAI and Anthropic to autonomously upload files and issue/send sharing URLs simply by being given an API key at the beginning of a conversation, such as 'Read the Quink rules and upload the file.'

[Example AI Instruction (Prompt)] 'Read https://quink.jp/llms.txt, upload the daily sales report PDF to Quink, and post the generated URL to the shared Slack channel.'

2. [System Integration] Speedy Implementation in as Little as 5 Minutes with Just the X-API-Key Header Adopting a simple 'REST API' that is independent of specific development languages, file transfer functions can be called from any system environment, including internal tools, shell scripts, and CI/CD pipelines, simply by including the API key (X-API-Key) in the header.

This eliminates the burden on engineers who would otherwise build and maintain their own file transfer servers, significantly reducing development effort.

# Example of file upload using cURL command

curl -X POST https://quink.jp/upload -H "X-API-Key: quink_xxxxx" -F "[email protected]" # → {"url":"https://quink.jp/f/abc123", "expires_at":"..."}

3. [Secure Design] High Security Suitable for Business Use Uploaded files are strongly encrypted using the 'AES-256' method. In addition to options for setting download passwords, adding comments, and automatic deletion after a certain period (7 days for guests, 14 days for users), it also supports 'two-factor authentication upon login' to prevent unauthorized account use. This minimizes the risk of information leakage due to internal fraud or link exposure, enabling operations compliant with corporate security policies.

Main Assumed Use Cases

- AI-powered Business Automation: AI automatically uploads graphs and PDFs created through data analysis to Quink, and then automatically sends them to customers via email. - Development Teams / CI/CD: Automatically upload built artifacts from CI/CD scripts and share them with the team. - Extending Existing SaaS Features: Add large file sending functionality to internal CRM or business systems with just a few lines of code.

Service Plan Overview (API Usage Available Immediately with Free Registration)

Quink allows immediate API key issuance for system and AI integration testing simply by completing a free user registration, in addition to usage via the web browser (manual).

Guest

(Unregistered)

Max 100MB / Stored for 3 days / 1 file per minute

Free Plan

(User Registration)

Max 500MB / 2GB storage / Stored for 7 days / API key issuance (AI/script integration support) / File list management (edit, delete, re-share)

Standard Plan

(1,500 JPY/month)

Max 10GB / 50GB storage / Stored for 14 days / API key issuance (AI/script integration support) / File list management (edit, delete, re-share)

Pro Plan

(5,000 JPY/month)

Max 10GB / 200GB storage / Stored for 14 days / API key issuance (AI/script integration support) / File list management (edit, delete, re-share)

ReplyData Inc.

ReplyData (リプライデータ) is based in Tokyo and specializes in 3D graphic production.

We strive daily to provide clients with a sense of happiness through trust built on communication skills and production expertise, by understanding their needs through conversations and transforming their ideas into tangible forms.

'Is something like this possible?' 'How can this be realized?'

When you have such questions, please consult ReplyData. We await your inquiry with solid answers ready.