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x402 Gateway Out-of-Band API Key Requirement Detection
x402
x402 Gateway Out-of-Band API Key Requirement Detection is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-31).
Returns a blunt decision procedure for AI agents to determine whether an x402-gated service requires an out-of-band API key before committing payment
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on x402 gateway out-of-band API key requirement detection before agent payment-0. Blunt decision procedure, not marketing.
Output
A JSON object containing a plain-prose decision procedure brief (120+ words) explaining whether and how out-of-band API key requirements apply to the x402 gateway, along with the generation source (llm, reasoning, or deterministic), the model used, and an ISO-8601 timestamp of when the brief was generated.
Example use cases
Pre-payment API key gate check
“I'm about to pay for an x402-gated service but I want to know if it requires an out-of-band API key before I send any money — can you run the detection procedure using GET so I don't waste a payment?”
Automated agent pre-flight check
“My agent is about to commit an x402 payment on my behalf — first have it check whether this gateway needs a separate API key registered out of band, using the decision procedure on GET.”
Custom topic API key requirement audit
“Check whether x402 gateways in the 'LLM inference' topic area typically require out-of-band API keys before payment — use the topic override and run a GET to get the blunt decision procedure.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/x402-gateway-out-of-band-api-key-requirement-det?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs a structured, actionable decision procedure — not marketing copy — to determine whether a specific x402 gateway mandates out-of-band API key registration before payment. It is especially valuable as a pre-payment gate check in autonomous agent workflows where wasted payments must be minimized. Prefer this over general documentation lookups when you need a blunt, machine-readable brief tailored to the x402 payment protocol.
Side effects
- Invalid HTTP method (only GET, HEAD, DELETE accepted) returns schema validation error
- Service slug not found returns ok:false with error detail
- Payment not completed returns unpaid response without decision brief
- Invalid meta parameter value (not 0 or 1) causes request rejection
- Upstream LLM failure may cause generationSource to fall back to deterministic mode
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "x402-gateway-out-of-band-api-key-requirement-det",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "x402-gateway-out-of-band-api-key-requirement-det",
"provider": "K-2SO"
}
}Tags
x402
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