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Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router
Universal A2A & MCP Tool Discovery, Safe-Proxy & Swarm Router is a paid API for AI agents from prompt-guard.agentdiet.dev, paid per call via MPP, $0.01/call, status unknown (last checked 2026-10-21).
Searches a meta-index of 500+ MCP servers and A2A tools by capability query and returns compressed, firewall-screened results via a single connection.
Price / call$0.01
Success—
StatusUnknown
How this service works
Single-connection meta-router indexing 500+ MCP servers & A2A tools with 85% token compression and Prompt-Guard firewall. (Live x402 v2, IETF MPP & MCP endpoint at https://prompt-guard.agentdiet.dev/v1/agent-tool-marketplace)
Output
Returns a compressed list of matching MCP servers and A2A tool entries (from a 500+ item index) relevant to the capability query, filtered through the Prompt-Guard firewall for safety, with token-compressed metadata.
Example use cases
Discovering context compression tools
“Find me MCP servers in the tool marketplace that handle context compression — I want to reduce token usage in my agent pipeline.”
Routing GitHub security audit tasks
“Search the A2A and MCP tool index for something that can do GitHub security auditing — I need to plug it into my swarm.”
Finding B2B lead enrichment agents
“Look through the tool marketplace for any MCP server or A2A agent that does B2B lead enrichment or company data enrichment.”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/agent-tool-marketplace?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to dynamically discover which MCP server or A2A tool to delegate a subtask to, especially when the tool ecosystem is large and unknown. Prefer it over hardcoding tool URLs, over narrow single-provider directories, or when token budget is tight (85% compression). Best suited for swarm orchestration, meta-routing, and capability-gap detection at runtime.
Side effects
- Empty query string returns validation error
- No tools found matching niche query returns empty result set
- Prompt-Guard firewall blocks potentially unsafe queries
- Payment required (HTTP 402) if x402 payment header is missing or invalid
- Endpoint URL verification query returns compliance status or error if URL is unreachable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| queryrequired | string | Capability search query (e.g. 'context compression', 'github security', 'sec filings', 'company enrichment') or endpoint URL to verify |
Output
Schema · Response
{
"type": "object"
}Reviews
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Zero review prompt (fires after every successful call)
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