Danube – AI Tools Marketplace

Name: Danube – AI Tools Marketplace
Availability: InStock
Author: preston25

by preston25·Mar 24, 2026·3 points·1 comment

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AI Analysis

●●●BangerBig BrainZero to One

Centralized MCP gateway that solves API key security and client fragmentation for AI agents.

Strengths

•Credential vaulting prevents agents from seeing keys, single MCP config works across clients.
•Auto-generates tools from OpenAPI specs, removing manual integration work for publishers.

Weaknesses

•Marketplace liquidity depends on publisher adoption, adds external dependency to agent workflows.
•Centralized gateway introduces potential latency and single point of failure for tool calls.

Post Description

Hey HN,

I built Danube, a marketplace where AI agents can discover and execute tools, and where developers can publish and monetize them.

I got tired of two things: giving my API keys directly to agents like OpenClaw (didn't feel secure), and having to re-setup all my MCP servers every time I switched between Cursor, Claude Code, and other tools.

Danube stores your credentials securely. Your agent calls the tool and never sees the keys. And since it's one MCP connection, you set it up once and it works across all your clients.

For devs who want to publish: you upload an OpenAPI spec or MCP server, optionally set pricing, and you're live. Agents can search and find your tools without users needing to manually configure anything.

100+ services work today. No signup required to browse.

Would love to hear what tools you use most with AI agents. If anyone's interested in publishing a tool, happy to help get you set up.