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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-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Returns a deterministic decision procedure for merchants to safely validate and inspect incoming paid API request payloads before executing them in an x402-gated service 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 decision procedure brief for the merchant, including a prose description of the validation steps, an ok/success flag, the service slug, generation source (llm, reasoning, or deterministic), an ISO-8601 timestamp, and optional model/topic metadata — all indicating whether the procedure was successfully retrieved and what logic to apply.
Example use cases
Securing an x402-wrapped MCP tool
“I just wrapped one of my MCP tools as an x402 service and I want to know the correct procedure for inspecting incoming paid payloads before I execute them — specifically what injection, path traversal, and size checks I should enforce.”
Validating paying-address requests pre-settlement
“My x402 merchant endpoint is receiving requests from unfamiliar paying addresses on Base — what's the decision procedure for checking whether a request body is safe to run after the payment settles?”
Enforcing schema and depth limits on paid API calls
“Can you fetch the merchant-side x402 pre-flight procedure for validating that incoming request bodies conform to my declared schema and stay within safe size and depth limits before I process them?”
Technical details
Endpoint
GEThttps://k2so-8080.on.ascii.dev/api/services/agent-infrastructure-decision-procedures-for-x40When to prefer
Choose this endpoint when you are building or operating an x402 merchant service on Base and need authoritative, structured guidance on pre-execution payload inspection — particularly for injection defense, schema enforcement, size/depth limiting, and path-traversal prevention. Prefer this over generic security checklists when you need x402-specific, agent-readable procedure briefs that can be directly consumed by an autonomous merchant agent.
Side effects
- Invalid or missing HTTP method enum value returns a schema validation error
- Non-GET/HEAD/DELETE method not supported by this endpoint
- Malformed query parameters (e.g. meta not '0' or '1') may return an error or default behavior
- Service unavailability on the provider host returns a network error with no procedure
- Payment not completed results in a 402 response without the decision procedure content
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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