kubbi
Managed claim-check API for secure AI agent payload handoffs.
If you're building multi-agent systems and tired of policing log leaks or SQS size caps, kubbi is worth a weekend test drive. The free tier is genuinely useful for prototyping, and Pro's $19/month is fair for moderate scale. Pass on it if you need streaming, persistent storage, or consumer-side auth.
Verified 3d ago · liveness 71/100 · cite: rightaichoice.com/tools/kubbi
- Developers building multi-agent AI systems needing secure payload handoffs
- Teams passing large or sensitive data between microservices without storing in logs
- Users of MCP servers or A2A protocols needing a side-channel for payloads
- Agent to human review workflows where data must be delivered exactly once
- Real-time streaming or low-latency data transfer (single-shot payload delivery only)
- Teams needing long-term storage or durable persistence (payloads auto-expire)
- Use cases requiring consumer-side authentication or access control (URL-based only)
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Skip kubbi if you need real-time streaming, long-term storage, consumer authentication, or payloads larger than 25 MB per package — those aren't supported even on paid tiers.
Going past your daily kubbi limit returns 429 responses, so you'll need to upgrade to Pro ($19/mo) or wait for the rolling 24-hour window to clear. This can stall your pipeline at high volume.
The free tier (20 kubbis/day) is more than enough for prototyping and small agent workflows; Pro at $19/mo is affordable for moderate production use. Compared to building your own claim-check service with S3 presigned URLs plus expiry logic, kubbi's pricing is competitive, especially considering the server-enforced security defaults and SDKs. For very high volume (500 kubbis/day), Enterprise custom pricing is needed.
In short
kubbi — Managed claim-check API for secure AI agent payload handoffs. Best for Developers building multi-agent AI systems needing secure payload handoffs, Teams passing large or sensitive data between microservices without storing in logs, Users of MCP servers or A2A protocols needing a side-channel for payloads. Free to start; paid plans from $19/mo.
What people actually say about kubbi — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
10 mentions across 1 source (YouTube) · researched Aug 24, 2026.
- +Server-enforced burn-after-read prevents accidental payload leaks
- +Short TTLs reduce window for unauthorized access
- +AES-256-GCM encryption at rest with per-payload IV
- +Multi-file bundles under one claim URL simplify complex handoffs
- +No consumer auth needed simplifies OPA handoff flows
- −No community feedback or case studies yet — unproven in production
- −Free tier TTL capped at 2 hours, limiting long-running workflows
- −Claim URLs are bearer tokens — interception means data theft
- −Payload size caps (16-256 KB) may be too small for many use cases
- −No consumer authentication means anyone with URL can claim payload
- • No public info on overage fees — likely require upgrading plans for higher usage
- • Potential extra latency from network round-trips to kubbi's servers
- • If you need consumer auth, you'll need to build it yourself on top
Viability Score
How well maintained and how widely used is kubbi? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: September 2026
How we score →Key Features
- Server-enforced burn-after-read (retrieval limit deletes payload)
- Short TTL expiry from seconds to days
- AES-256-GCM encryption at rest with per-payload IV and auth tag
- Manifest preview (file names, sizes, types) before claiming
- Multi-file package support under one claim URL
- Producer-side inspect and delete early
- TypeScript SDK
- Python SDK
- REST API
- MCP server with six native tools (kubbi_send, kubbi_send_files, kubbi_claim, kubbi_inspect, kubbi_get, kubbi_delete)
- No consumer authentication needed (URL-only)
- Rate limiting per API key
- Plan-based quotas (daily and active kubbi limits)
- Static consumer-side claim() and inspect() functions (no API key needed)
- Multiple terminal states (expired, burned, deleted) wipe the row and overwrite ciphertext
About kubbi
kubbi is a managed claim-check service that lets AI agents pass payloads — files, JSON, multi-file bundles — without stuffing them into queues, webhooks, MCP tool results, or A2A messages. Those channels are fine for control flow but awkward for data: size limits (like SQS's 256 KB cap), sensitive bytes lingering in logs, and packages that don't fit inline. With kubbi, the producer stores the payload once via API and gets a short-lived, unguessable claim URL. The channel carries only the URL, and the consumer retrieves the bytes with that URL alone — no API key or account needed. It's built for developers orchestrating multi-agent systems, especially where data crosses trust boundaries or must be delivered exactly once. kubbi enforces four capabilities server-side, so you don't have to remember to set them: burn-after-read (a retrieval limit that deletes the payload once hit), short TTL (expiry by seconds, minutes, or hours, with short defaults), AES-256-GCM encryption at rest with per-payload IV and auth tag, and manifest preview (consumers see file names, sizes, and types before claiming). You can send multi-file packages under one claim URL, and producers can inspect metadata or delete early. Every kubbi ends in one of three terminal states — expired, burned, or deleted — wiping the row and overwriting ciphertext on storage. Integration is straightforward. kubbi offers TypeScript and Python SDKs, a REST API, and an MCP server with six native tools (kubbi_send, kubbi_send_files, kubbi_claim, kubbi_inspect, kubbi_get, kubbi_delete). It pairs with A2A protocols, webhooks, and queues like SQS or Kafka. The free tier gives you 20 kubbis per day, 16 KB payloads, and a 2-hour maximum TTL — generous for prototyping. Pro costs $19/month and scales to 64 KB payloads and 2-day TTL; Enterprise (custom) goes up to 256 KB payloads and 7-day TTL. Compared to assembling your own with S3 presigned URLs or inline webhooks, kubbi adds server-enforced burn-after-read, multi-file
Behind the Verdict
kubbi targets a real pain: getting bytes from one agent to another without bloating control channels or leaking data into logs. The core idea is simple — store the payload, pass a URL — but the execution is what makes it useful. Burn-after-read is server-enforced, not a flag you remember to set; TTL defaults are short; encryption is AES-256-GCM with no setup. That's the kind of default-on behavior that saves you from yourself. When should you pick kubbi? If you're passing sensitive payloads between agents across trust boundaries, or if you're hitting size limits on SQS or webhooks, kubbi removes the friction without requiring a shared bucket or credentials. The consumer side needs no API key — just the URL — which simplifies cross-vendor handoffs. The MCP server with six native tools means agents can discover and use kubbi at runtime with one config. When should you pass? If you're building a real-time streaming pipeline, kubbi is single-shot delivery, not a stream. If you need payloads to live beyond a few days, the max TTL (7 days on Enterprise) won't cut it. And there's no consumer-side authentication — anyone with the URL can claim the payload, so it's not for scenarios where you need per-recipient access control. The closest alternative is rolling your own with S3 presigned URLs. You could build that in a weekend, but you'd be responsible for expiry, burn-after-read, audit trails, and multi-file bundling. kubbi handles those with sensible defaults. Raw webhooks with inline payloads are simpler, but your data sits in logs. kubbi avoids that. In practice, the decision comes down to whether the cost of $19/month for Pro is worth not maintaining your own claim-check infrastructure. For a team shipping a multi-agent system, it probably is.
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Real-world workflow fit
Concrete scenarios for the personas kubbi actually fits — and what changes day-one when you adopt it.
Your MCP server needs to return a payload to a downstream agent. You call kubbi_send_files with config and data files, get a claim URL, return it in the MCP tool result. The downstream agent claims it via kubbi_claim.
Outcome: Secure payload transfer without exposing data in MCP messages, with server-enforced burn-after-read and TTL.
You want to pass a large JSON payload through SQS but hit the 256 KB limit. You store the payload with kubbi's REST API, put only the claim URL in the SQS message. The consumer service claims the payload when processing.
Outcome: Bypass SQS size limits and avoid sensitive data lingering in SQS logs.
You need a reviewer to inspect a file before a critical operation. You send a kubbi with max_retrievals=1 and share the claim URL via email. The reviewer previews the manifest and claims it. The payload is automatically deleted after review.
Outcome: A one-time review flow with no leftover data and automatic cleanup.
Use Cases
- Transfer sensitive configuration files between AI agents without exposing them in queuing logs.
- Bundle a multi-file package (config, data, instructions) for a downstream agent to claim exactly once.
- Pass large payloads through A2A messages without hitting size limits or encrypting inline.
- Implement a burn-after-read handoff for one-shot agent tasks like file processing or code review.
- Decouple payload delivery from control flow in agent orchestration pipelines using webhooks or MCP.
- Enable human-in-the-loop review by sharing a claim URL that disappears after the reviewer inspects it.
Limitations
- Payload size is limited even on paid plans (max 25 MB on Enterprise).
- Daily kubbi creation quotas constrain high-volume usage unless you upgrade to Enterprise.
- The consumer has no authentication, so anyone with the URL can claim the payload — security relies on URL unguessability and limited retrievals.
- TTL is capped per plan (Free: 2 hours, Pro: 2 days, Enterprise: 7 days).
- No built-in consumer identity verification.
as of 2026-08-24
Verification history
We have re-verified kubbi 8 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-checked, vendor evidence unchanged
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Showing the 6 most recent of 8 verification passes.
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published kubbi tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0/month
Ideal for
Individual developers or hobbyists prototyping agent handoffs with small payloads up to 16 KB and up to 20 kubbis per day — no credit card needed.
What this tier adds
Starting tier with 20 kubbis/day, 5 active at a time, 16 KB payload, 2-hour max TTL, and community support. Entry-level quotas for testing.
Pro
$19/month
Ideal for
Professional developers and teams running moderate production workloads: 100 kubbis/day, 64 KB payloads, 2-day TTL, and priority support — fits most agent pipelines.
What this tier adds
Adds 5x more daily kubbis, 4x larger payloads, longer TTL, 5 API keys, 25 retrievals per kubbi, 100 requests/min, plus priority support — for $19/mo.
Enterprise
Custom
Ideal for
Organizations with custom requirements: high volume (500 kubbis/day), larger payloads (256 KB/25 MB), 7-day TTL, dedicated support, SLAs, and SSO — for production at scale.
What this tier adds
Biggest quotas across the board, 25 API keys, 100 retrievals per kubbi, 500 requests/min, custom SLAs, dedicated support, and SSO — custom pricing via sales.
Where the pricing makes sense
The company stage and team size where kubbi's pricing actually pencils out — and where peers do it cheaper.
The free tier (20 kubbis/day) is more than enough for prototyping and small agent workflows; Pro at $19/mo is affordable for moderate production use. Compared to building your own claim-check service with S3 presigned URLs plus expiry logic, kubbi's pricing is competitive, especially considering the server-enforced security defaults and SDKs. For very high volume (500 kubbis/day), Enterprise custom pricing is needed.
Setup time & first value
How long it actually takes to get something useful out of kubbi — broken out by persona, not the marketing-page minute.
Sign up for an API key (free, no credit card) and you can create your first kubbi in under two minutes. The TypeScript or Python SDK installs via npm/pip and you're ready to send and claim payloads. The MCP server can be configured in a few minutes by adding a single config line. Most developers get to first value within 15 minutes.
Switching to or from kubbi
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From S3 presigned URLs: Replace presign+expiry logic with kubbi API calls. You'll get burn-after-read and manifest preview, and you remove the need to manage IAM policies for presigning.
- →From inline webhooks: Store the payload with kubbi, send only the claim URL in the webhook body. This removes size limits and keeps sensitive data out of webhook logs.
- →From SQS inline messages: For payloads >256 KB, use kubbi to store and pass the claim URL via SQS. The consumer calls kubbi to retrieve the payload.
- ↗To self-hosted MinIO or S3: You can implement a similar claim-check pattern with presigned URLs and your own TTL/burn-after-read logic, though you'll lose the managed security defaults and manifest preview.
- ↗To a proprietary claim-check service: If you need consumer authentication or larger payloads, you might build your own with a custom API and KMS.
Integrations
Resources & Guides
- Documentationkubbi.ai
Docs · kubbi
Full product docs from kubbi.ai
- Quickstartkubbi.ai
Quickstart · kubbi
Get up and running fast from kubbi.ai
- Quickstartkubbi.ai
Mcp Quickstart · kubbi
Get up and running fast from kubbi.ai
- Conceptskubbi.ai
Claim Urls · kubbi
Core ideas explained from kubbi.ai
- Documentationkubbi.ai
Cross Vendor Mcp Handoff · kubbi
Full product docs from kubbi.ai
- API Referencekubbi.ai
Overview · kubbi
Methods, params, types from kubbi.ai
- Documentationkubbi.ai
Mcp · kubbi
Full product docs from kubbi.ai
Tutorials & Learning
Official links
Featured Head-to-Head Comparisons
Kubbi vs Spider Cloud
Spider Cloud and kubbi solve entirely different problems: Spider Cloud fetches external web data for AI agents, while kubbi shuttles internal payloads between agents. Neither is a substitute for the other. Choose Spider Cloud if you need to scrape, crawl, or search the web for RAG; choose kubbi if you need a secure, ephemeral handoff mechanism within your multi-agent system. They can even complement each other in a single pipeline.
Kubbi vs Temporal Ai
Temporal AI and kubbi address different problems: Temporal is a full-featured orchestration engine for durable, fault-tolerant workflows, while kubbi is a focused claim-check service for secure payload handoffs. Choose Temporal if you need reliability, state persistence, and multi-step orchestration; choose kubbi if your main challenge is passing sensitive payloads between agents without polluting channels.
Kubbi vs Presto Voice
Presto Voice and kubbi serve entirely different domains—Presto automates drive-thru ordering for QSR chains, while kubbi provides secure payload handoff for AI agent architectures. If you run a multi-location QSR aiming to boost revenue via voice AI upselling, Presto Voice is the clear choice. For developers needing a managed claim-check service with encryption and TTL for agent-to-agent data transfer, kubbi is the pragmatic pick. Neither tool competes directly; your workflow dictates the winner.
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