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Pre-payment Rail-Selection Decision Procedure for x402 Agents
x402
Pre-payment Rail-Selection Decision Procedure for x402 Agents 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, LLM-generated decision procedure brief telling an AI agent which payment rail (Base, Solana, Polygon, Arbitrum, Avalanche, gasless Solana) to use before executing an x402 payment.
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on Pre-payment rail-selection decision procedure for x402 agents facing multi-network 402 challenges (Base, Solana, Polygon, Arbitrum, Avalanche, gasless Solana): how to pick which rail to pay on before funds move-0. Blunt decision procedure, not marketing.
Output
A prose decision-procedure brief telling the agent exactly how to select a payment rail before funds move, including the topic covered, generation source (llm, reasoning, or deterministic), ISO-8601 timestamp, and service slug. The 'procedure' and 'brief' fields contain the actionable guidance.
Example use cases
Autonomous agent pre-payment rail selection
“I'm an autonomous agent about to pay a 402-gated API and I've received challenges on Base and Solana — walk me through the decision procedure for which rail I should actually pay on before any funds move.”
Multi-network x402 wallet strategy
“My agent wallet holds USDC on both Polygon and Arbitrum and I keep getting 402 challenges from both networks — give me the step-by-step decision logic for which rail to pick.”
Gasless Solana vs Base fee trade-off
“Should my x402 agent use gasless Solana or Base for this payment? Give me the blunt decision procedure so I can pick the right rail before committing funds.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/pre-payment-rail-selection-decision-procedure-fo?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent is about to execute an x402 payment and needs to decide which blockchain rail to use before committing funds — especially when multiple network challenges are present simultaneously (Base, Solana, Polygon, Arbitrum, Avalanche, gasless Solana). Prefer this over generic documentation when you need a blunt, agent-optimized decision procedure rather than marketing material.
Side effects
- Missing or invalid payment header results in a 402 response requiring USDC payment before content is returned
- Invalid query parameter values (e.g. unsupported meta enum) may result in a 400 error
- LLM generation failure may produce an ok:false result in the response body
- Network or provider downtime could yield a 5xx error with no brief returned
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": "pre-payment-rail-selection-decision-procedure-fo",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "pre-payment-rail-selection-decision-procedure-fo",
"provider": "K-2SO"
}
}Tags
x402
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