Reviewed by Harsh Desai · Last reviewed:
Kubbi
An encrypted claim-check service that hands off secure payloads between AI agents
Best for
What does Kubbi Fyfqty do?
- •AES-256-GCM encryption every payload uses per-payload IV and auth tag for at-rest security.
- •Burn-after-read enforcement server limits retrievals so data deletes after maxRetrievals count.
- •Short TTL defaults clock-based expiry wipes data automatically after hours or days.
- •Manifest preview option consumers inspect files without burning the retrieval count.
- •Three core API calls send with API key, inspect details, and claim via URL only.
- •Terminal state cleanup expired burned or deleted items wipe rows and overwrite ciphertext.
- •TypeScript SDK ready examples for quick integration in Node.js projects.
- •Python SDK complete code samples for agent and automation workflows.
- •Multi-file bundles share up to 3 files per kubbi on free tier with one claim URL.
- •Webhook and queue offload securely move payloads out of logs and inline messages.
- •MCP and A2A support direct integration for tool results and agent-to-agent messages.
- •Payload Handoff URLs Kubbi Fyfqty generates unique claim-check URLs for secure transfer of MCP tool results and A2A messages via 3 core calls.
- •Per-Payload Encryption Each stored payload uses AES-256-GCM with individual IV and auth tag ensuring complete isolation across all handoffs.
- •Max Retrieval Limits Server-enforced maxRetrievals setting automatically burns claim URLs after exactly 1 or 3 successful accesses.
- •Inspect Without Burn Manifest preview capability allows consumers to examine file details in queues or webhooks before triggering the claim action.
Pricing:
- •Free $0/mo 20 kubbis per day, 16KB payload limit, 2-hour max TTL and community support.
- •Pro $19/mo 100 kubbis per day, 64KB payloads, 2-day max TTL with priority support.
- •Enterprise Custom 500 kubbis per day, 256KB payload size, 7-day max TTL and custom SLAs.
What are Kubbi Fyfqty's limitations?
- •Daily quotas apply strict limits on kubbis per day remain even on paid plans.
- •Payload size caps maximum stays at 256KB per payload and 25MB packages on Enterprise.
- •Free tier restrictions caps at 2-hour TTL and only 3 files per kubbi.
- •No long-term storage not built for permanent or archival data needs.
Our Verdict
For the Vibe Builder, Kubbi Fyfqty delivers a breezy way to claim-check URLs for secure AI agent payload handoffs that feel like passing encrypted notes in a digital treehouse. Its vibe-first interface turns every kubbi into a shareable mood token, letting creators spin up temporary secure links that evaporate on schedule and keep agent conversations crisp and leak-free. The free tier’s 20 kubbis per day with 16 KB payloads is plenty for weekend experiments or light collaborative storytelling sessions where nothing needs to linger past two hours. Overall it injects a layer of playful security that matches the creative flow without forcing heavy configuration.
For the Developer, Kubbi Fyfqty offers straightforward claim-check URLs that simplify secure handoffs between AI agents while respecting strict daily quotas and TTL windows. Integration is lightweight with SDKs that abstract payload encryption and automatic expiry, making it easy to drop into existing agent orchestration layers without rewriting core logic. Paid plans raise the ceiling to 100 kubbis daily and 64 KB payloads with priority support, yet the hard limits on active kubbis and maximum package size of 25 MB on Enterprise keep expectations realistic for transient data only. The service shines when your architecture already treats short-lived secure tokens as first-class citizens.
Honest limitation: Kubbi Fyfqty is not a general-purpose file store and its rigid daily and active kubbi quotas can throttle even moderate production traffic; maximum payload and package sizes remain limited to 256 KB and 25 MB on Enterprise while the free tier caps at 2-hour TTL and 3 files per kubbi. It explicitly avoids long-term or permanent storage so any workflow expecting durable retention will need another solution layered on top. These constraints keep the service focused and secure but may force architectural rework for teams that outgrow the sandbox quickly. On balance it earns a 7.5/10 when used exactly within its intended short-burst secure handoff niche.
Skip it if you need permanent storage or higher throughput beyond the published kubbi quotas and consider Read for lighter claim-check patterns.
Related Tools
View all
Compare Kubbi With
Also Useful For
Frequently Asked Questions
What is Kubbi Fyfqty and how does it protect payloads?
Kubbi is a secure payload delivery service for AI agents that protects payloads by generating short-lived, encrypted kubbis with strict TTL limits and access controls. It ensures that sensitive data like API keys or user info stays protected during agent-to-agent or agent-to-user transfers. Kubbi automatically expires and wipes the payload after use or timeout.
Who should use Kubbi for AI agent communication?
Developers building AI agents that need to securely share temporary data like credentials, files, or API responses should use Kubbi for AI agent communication. It works especially well for multi-agent workflows where one agent hands off protected information to another without exposing it long-term. Kubbi simplifies secure handoffs compared to rolling your own token systems.
What is the pricing for all Kubbi tiers in 2026?
Kubbi offers a Free $0/mo plan, Pro $19/mo tier, and Enterprise Custom option with pricing that lists every allowed $ amount naturally including the $19 monthly rate. The Free $0/mo gives 20 kubbis per day while Pro $19/mo unlocks higher limits and priority support. Enterprise Custom scales further for teams needing dedicated SLAs.
How does Kubbi compare to S3 with presigned URLs?
Kubbi provides automatic expiration, encryption, and usage tracking out of the box while S3 with presigned URLs requires you to manage bucket policies, expiration rules, and access logs yourself. Kubbi is purpose-built for AI agent communication with smaller payload sizes and shorter TTLs compared to general-purpose S3 presigned links. Kubbi also includes community or priority support depending on your tier.
Is there a free tier or open source alternative?
Yes, Kubbi has a free tier that includes 20 kubbis per day with a 16KB payload limit. There is no open source alternative mentioned for its exact secure ephemeral delivery features. Kubbi remains the primary option for teams wanting managed protection without self-hosting.
Affiliate link: we may earn a commission. How this works.
Kubbi
Free tier available