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X402-BROKER Paywall Check
x402
X402-BROKER Paywall Check 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).
Checks whether a given HTTP URL is protected by an x402/L402 paywall and returns access status with compression ROI proof
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 with any retrieved content, and an roi_proof object containing a compression_ratio_pct value (e.g. 91.4) demonstrating the efficiency of the gateway's data handling.
Example use cases
Pre-flight paywall detection for agent
“Before my agent tries to call https://api.someservice.dev/query, can you check if it's behind an x402 or L402 paywall so I know whether to authorize a USDC payment first?”
MCP server access verification
“I want to know if this MCP server endpoint at https://mcp.toolprovider.io/execute requires micropayment access — can you probe it with a GET and tell me the paywall status?”
API monetization audit
“Can you check whether https://data-api.example.com/v1/resource is protected by an x402 paywall, and give me the compression ROI proof if it returns one?”
Technical details
Endpoint
GEThttps://mcp-gateway.agentdiet.dev/v1/paywall-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to programmatically determine whether a target URL is protected by an x402, L402, or MPP paywall before committing to a payment flow. It is particularly useful in agentic workflows where an agent must decide dynamically whether to authorize a micropayment, and when the target could be any of 31,390+ MCP servers or x402 APIs in the broker's network. Prefer this over manual inspection or generic HTTP HEAD checks when you need structured paywall-presence confirmation plus ROI proof metadata.
Side effects
- URL is unreachable or returns non-HTTP error — status will reflect failure
- URL is not x402/L402 protected — paywall check returns no gate detected
- Invalid or missing 'url' query parameter — request rejected with schema validation error
- Upstream endpoint rate-limits or blocks the probe request
- USDC payment on Base fails to settle — call not executed
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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