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Everything you need to know about integrating human approval and secure file handoffs into your AI workflows.
Relayna is an API that adds human-in-the-loop (HITL) approval checkpoints and secure file handoffs to AI agent workflows. It allows agents to pause execution, request human review via a magic link, and automatically resume via webhooks once a decision is made.
Unlike basic cloud storage, Relayna is a stateful workflow coordinator. While it uses Cloudflare R2 for secure file storage, it also provides a built-in reviewer UI, manages approval states (pending, approved, rejected), and triggers webhooks to resume your AI agent.
While tools like Webhook.site are built for inspecting raw payloads, Relayna is a workflow orchestrator. Relayna not only catches webhooks but also provides a polished, secure UI for human reviewers, manages the approval state machine (Approved/Rejected), and fires a return webhook to your system to trigger the next step in your automation.
Yes. You can use the Relayna Assets API as a standalone secure file relay. Agents can upload files, set an automatic expiration time (TTL), and generate temporary presigned URLs to share files with users or other agents without creating a review checkpoint.
Yes! You can see exactly what a reviewer sees on our interactive demo page.
No. Reviewers do not need an account. They access review checkpoints using secure, token-based magic links. This allows anyone to approve or reject an AI agent's action with zero friction.
Relayna secures files by storing them encrypted-at-rest on Cloudflare R2 and restricting access to temporary, presigned URLs. You can also configure a Time-to-Live (TTL) so that files automatically expire and are deleted after a set period.
Relayna is designed with security-first principles. All files are encrypted-at-rest and served via temporary URLs. We offer configurable Time-to-Live (TTL) settings so that sensitive files (like invoices or logs) are automatically deleted from our servers immediately after review or after a set period, supporting data minimization requirements.
You can instantly revoke access by using the Relayna API to cancel the review checkpoint or revoke the specific review link. Once revoked, the magic link and any associated file URLs will immediately return a 404 error.
You can integrate Relayna into n8n using the HTTP Request node to create a checkpoint and the Webhook node to receive the approval callback. This allows your n8n workflow to pause mid-execution, wait for a human to review data via a magic link, and resume automatically once the decision is received.
Yes. Because Relayna is a standard REST API, you can add it as a tool or function to any CLI-based agent. Simply provide the agent with our OpenAPI specification, and it can autonomously upload files and request human review when it reaches a high-stakes decision point.
You can use our OpenAPI spec (available at /api/json/open_api) with tools like openapi-generator, fern, or pydantic-codegen. This allows you to generate native Python, TypeScript, or Go clients instantly, ensuring your integration is type-safe and consistent with our latest API version.
Relayna is a language-agnostic REST API. It works with any language (Python, TypeScript, Go) and any AI framework (LangChain, AutoGPT, n8n). We also provide an OpenAPI specification so you can automatically generate native clients or feed it directly into LLM tool-calling arrays.
Relayna primarily uses webhooks to notify your system in real-time. When a reviewer makes a decision (approved, rejected, or changes requested), Relayna sends a POST request with the decision payload to your configured callback URL. Alternatively, your agent can poll our lightweight checkpoint status endpoint to check for updates, which is useful for local agents or environments behind strict firewalls.
Relayna supports and renders all standard file types in the browser, including PDFs, images (PNG, JPG, WEBP), CSVs, JSON data, and plain text. If a file cannot be rendered natively, the reviewer is provided a secure download button.
Yes. The Relayna Starter plan is completely free and includes up to 100 human review checkpoints per month, making it ideal for testing and side projects.
On the Builder and Scale plans, we will notify you as you approach your limit. Your workflows will not be hard-blocked immediately. For custom high-volume needs, contact our enterprise team.
Yes. Annual billing is available on all paid plans and includes a discount equivalent to two months free per year.
We're here to help you build better AI workflows. Reach out to our team anytime.
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