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X402-Broker Preflight – MCP/A2A/x402 Meta-Router Capability Check
x402
X402-Broker Preflight – MCP/A2A/x402 Meta-Router Capability Check is a paid API for AI agents from x402broker.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-27).
Performs a preflight lookup against the X402-Broker meta-index to retrieve capability routing metadata, quality scores, and execution parameters for a given MCP server, x402 API, or A2A agent endpoint URL.
Price / call$0.01
Success—
StatusUnknown
How this service works
Universal B2A/A2A/MCP Meta-Router & Autonomous Tool Marketplace indexing 7,340+ live capabilities across x402 v2 (5-chain EVM USDC), IETF MPP, and L402 with TDQS quality scoring and zero-fee pass-through execution.
Output
Returns a JSON object with a 'status' field ('ok' or error), a 'data' object containing routing metadata and capability descriptors for the queried endpoint, and a 'roi_proof' object including a compression_ratio_pct value (e.g. 91.4%) indicating token efficiency. Confirms whether the endpoint is indexed, live, and callable.
Example use cases
Validate MCP tool before agent call
“Before my agent calls that MCP server at https://weather-mcp.example.com/forecast, do a preflight check via X402-Broker to confirm it's live, indexed, and get its quality score and routing details.”
Discover best-scored x402 API for task
“I need to find whether https://translate-api.example.com/v1/translate is registered in the X402-Broker index — can you preflight it with a GET method and tell me its TDQS score and compression ratio?”
Route A2A agent request safely
“Before my workflow routes to the A2A agent at https://summarizer-agent.example.com, run a preflight lookup on X402-Broker to get the execution parameters and check if it supports GET so I know it's safe to call.”
Technical details
Endpoint
GEThttps://x402broker.com/v1/preflight?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to verify, discover, or preflight a specific MCP server, x402 API, or A2A agent URL before committing to a call — especially when quality scoring (TDQS), token compression metadata, or cross-protocol routing (x402 v2, IETF MPP, L402) information is needed. Prefer this over direct tool calls when you want to confirm a capability is live and indexed without side effects.
Side effects
- URL not indexed in the broker returns empty data or 404-equivalent status
- Invalid or missing 'url' query parameter causes schema validation failure
- Endpoint is indexed but currently offline returns degraded status
- Unsupported HTTP method value returns enum validation error
- Payment of $0.01 USDC not fulfilled causes 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {},
"status": "ok",
"roi_proof": {
"compression_ratio_pct": 91.4
}
}
}Tags
x402
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