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Merchant-side x402 Pre-flight Payload Inspection Procedure
x402
Merchant-side x402 Pre-flight Payload Inspection Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Returns a deterministic decision procedure brief for x402 merchants to safely validate, size-check, and injection-scan incoming paid API request payloads before execution on Base.
Price / call$0.002
Success—
StatusUnknown
How this service works
Deterministic decision procedure for a merchant that wraps an API or MCP tool as an x402 service on Base, deciding whether an incoming paid request payload is safe to execute after settlement. Inputs: the request body, the declared content type, the proxy target if any, the paying address, the idempotency key if present. Procedure: (1) validate the payload against the declared schema before payment execution, (2) enforce size and depth limits, (3) check for injection and path-traversal vectors
Output
A structured response containing a prose decision procedure brief (the 'brief' field) with step-by-step guidance for validating x402 payloads, along with the service slug, topic, model, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp. The 'ok' boolean indicates handler success.
Example use cases
Securing an x402-wrapped AI tool endpoint
“I'm wrapping a code-execution MCP tool as an x402 service on Base — what pre-flight checks should I run on the incoming request payload before I execute anything and settle the payment?”
Preventing injection in a paid proxy service
“My x402 merchant proxy forwards paid requests to a backend REST API. Walk me through the injection and path-traversal checks I need to enforce on each incoming request body before I let it through.”
Enforcing payload size limits on a paid API
“I need to protect my x402-gated API from oversized or deeply nested payloads — what are the size and depth limits I should enforce, and at what point in the payment flow should I apply them?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-infrastructure-decision-procedures-for-x40When to prefer
Choose this endpoint when building or auditing an x402 merchant service on Base that needs to safely gate execution of paid API or MCP tool calls — specifically when you need a concrete, authoritative decision procedure for payload validation, injection prevention, and size enforcement before payment settlement. It is purpose-built for the x402 protocol context and covers Base-specific merchant security concerns that generic API security guides do not address.
Side effects
- Invalid or missing required 'input' object returns a schema validation error
- Unsupported HTTP method (non-GET/HEAD/DELETE) rejected by enum constraint
- Service unavailable on k2so.wrong.systems returns network error
- Payment not settled before request execution results in 402 response requiring x402 payment flow
- Malformed query parameters return validation errors
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": "agent-infrastructure-decision-procedures-for-x40",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-infrastructure-decision-procedures-for-x40",
"provider": "K-2SO"
}
}Tags
x402
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