x402 Unsupported Rail Triage Decision Procedure

x402

x402 Unsupported Rail Triage Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Returns an AI-generated decision procedure brief helping agents triage and handle unsupported payment rails in the x402 protocol ecosystem

Price / call$0.002

Seller volume →—

Success—

StatusUnknown

How this service works

Deterministic procedure for an agent that receives an HTTP 402 challenge on a rail or protocol version its payment client does not support. Inputs: rail identifier and version from the payment challenge headers, client support matrix, facilitator availability (PayAI, MPP gateway), budget floor. Decision: pay directly when the rail is supported, route through a facilitator when the rail is bridged and facilitator fee is under 15 percent of quote, upgrade client when the version gap is one minor

Output

A JSON object containing a plain-prose decision procedure brief (120+ words) written for AI agents, covering how to triage unsupported payment rail situations in the x402 protocol. Includes the generating model name, topic string, service slug, ISO-8601 generation timestamp, and a generationSource field indicating whether the content came from an LLM, reasoning engine, or deterministic logic. Also returns payment confirmation fields (ok, paid, provider).

Example use cases

Triage failed x402 rail mid-workflow

“My autonomous agent just hit an x402 unsupported rail error while trying to pay for a data API call — what's the step-by-step decision procedure I should follow to decide whether to retry, reroute, or abort?”

Pre-flight policy check for new rail

“Before my agent starts calling a new set of x402 merchants, I want to know the triage procedure it should apply if any of them respond with an unsupported rail — can you fetch that decision brief?”

Debugging x402 integration failures

“We're building an x402 agent and keep getting unsupported rail responses in staging — give me the official triage decision procedure so we can encode the right fallback logic into the agent.”

Technical details

Endpoint

GEThttps://k2so.wrong.systems/api/services/x402-unsupported-rail-triage-decision-procedure?utm_source=zero.xyz

When to prefer

Choose this endpoint when an autonomous agent needs structured, prose-form policy guidance specifically for triage of unsupported payment rails in the x402 protocol — not for general x402 error handling, payment execution, or rail selection. Particularly useful when encoding fallback logic into an agent workflow or auditing agent behavior against a canonical decision procedure. Prefer over generic LLM prompts because it delivers a curated, versioned, agent-optimized brief with a stable schema.

Side effects

HTTP 402 returned if USDC payment not yet settled — agent must pay exact amount and retry with PAYMENT-SIGNATURE header
Payment signature mismatch or expired signature causes rejection
Topic override parameter may produce off-target brief if the string is ambiguous
LLM generation failure may fall back to deterministic source with reduced richness
Network timeout if the upstream LLM provider is slow

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-unsupported-rail-triage-decision-procedure",
      "procedure": "same as brief",
      "generatedAt": "2026-01-01T00:00:00.000Z",
      "generationSource": "deterministic"
    },
    "service": "x402-unsupported-rail-triage-decision-procedure",
    "provider": "K-2SO"
  }
}

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