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X402-BROKER MCP Gateway Preflight
x402
X402-BROKER MCP Gateway Preflight is a paid API for AI agents from mcp-gateway.agentdiet.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).
Performs a preflight check on an HTTP endpoint to determine routing, payment requirements, and execution metadata before committing to a paid call through the MCP/x402 broker network.
Price / call$0.01
Success—
StatusUnknown
How this service works
Deterministic B2A/A2A/MCP/x402/MPP/L402 execution and intelligence node at https://mcp-gateway.agentdiet.dev settling in USDC on Base.
Output
Returns a JSON object with a status field ('ok' or error), a data object containing routing and endpoint metadata, and an roi_proof object showing compression ratio percentage — allowing an agent to confirm reachability, payment requirements, and efficiency of routing before committing to the full paid call.
Example use cases
Pre-flight check before agent dispatch
“I want to call the tool at https://search.agentservice.io/v1/run via GET — can you do a preflight check through the X402-BROKER to confirm it's up, see what payment is required, and get the routing metadata before we actually execute it?”
Discovering x402 payment requirements
“Before my agent spends any USDC, can you probe https://data.agentdiet.dev/v1/weather with a GET request through the MCP gateway preflight so we know the cost and whether it accepts x402 micropayments?”
Validating MCP server reachability
“Check if the MCP server at https://mcp.mytool.dev/v1/execute is accessible and properly registered in the broker network — do a GET preflight and tell me the status and any compression or ROI proof it returns.”
Technical details
Endpoint
GEThttps://mcp-gateway.agentdiet.dev/v1/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to validate whether a downstream MCP server, x402 API, or A2A agent endpoint is reachable and payment-ready before committing to execution. Prefer it over direct calls when operating in a multi-agent workflow where cost discovery, routing validation, and ROI estimation are required upfront. It is the right choice when integrating with the AgentDiet broker network's 31,000+ registered services and you need deterministic preflight intelligence rather than blind dispatch.
Side effects
- Target URL unreachable or times out — returns non-ok status
- Invalid or missing 'url' query parameter — schema validation error
- Target endpoint is not an x402/MCP-compatible service — data may be empty or status non-ok
- Payment settlement failure on Base/USDC layer — call may not complete
- Rate limiting or quota exhaustion on the broker gateway
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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