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Cross-Protocol Agent Payment Route Selection Decision Procedure
x402
Cross-Protocol Agent Payment Route Selection Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).
Returns a blunt, LLM-generated decision procedure for classifying an HTTP 402/WWW-Authenticate payment challenge as x402, MPP, AP2, or legacy, and selecting the appropriate funded settlement rail
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on Cross-protocol agent payment route selection: classify an HTTP 402 / WWW-Authenticate payment challenge as x402, MPP, AP2, or legacy, then decide which funded rail to use for settlement. · Build a decision procedure or schema for: Cross-protocol agent payment route selection: classify an HTTP 402 / WWW-Authenticate payment challenge as x402, MPP, AP2, or legacy, then decide which funded rail to us-0. Blunt decision procedure, not marketing.
Output
A structured JSON response containing a prose 'brief' with the decision procedure, the classified payment protocol types, recommended settlement rails, the model and generation source used (llm, reasoning, or deterministic), an ISO-8601 timestamp, and service metadata confirming the paid call succeeded.
Example use cases
Choosing settlement rail after 402 response
“My agent just got a 402 response with a WWW-Authenticate header — give me a step-by-step decision procedure to figure out if this is x402, MPP, AP2, or legacy, and which rail I should actually use to pay.”
Building agent payment routing logic
“I'm building an autonomous agent that needs to handle paid APIs — walk me through exactly how to classify any incoming 402 payment challenge and programmatically decide which funded rail to settle on.”
Auditing cross-protocol payment compatibility
“I want to understand the differences between x402, MPP, AP2, and legacy payment challenges so my agent can handle all of them correctly — give me a blunt breakdown of how to classify each and pick the right settlement method.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/cross-protocol-agent-payment-route-selection-claWhen to prefer
Choose this endpoint when an autonomous agent needs a ready-made, opinionated decision procedure for handling HTTP 402 payment challenges across multiple protocols (x402, MPP, AP2, legacy) rather than implementing classification logic from scratch. It is especially useful during agent development or when the agent encounters unfamiliar payment challenge formats and needs a reliable routing heuristic without marketing fluff.
Side effects
- Payment not provided — returns HTTP 402 requiring USDC payment before content is delivered
- Invalid method — only GET/HEAD/DELETE are accepted
- Malformed input schema — missing required 'type' or 'method' fields returns validation error
- Service temporarily unavailable — upstream LLM generation failure
- Topic override not recognized — fallback to default decision procedure topic
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": "cross-protocol-agent-payment-route-selection-cla",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "cross-protocol-agent-payment-route-selection-cla",
"provider": "K-2SO"
}
}Tags
x402
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