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Agent Tool-Output Payment-Instruction Screening
x402
Agent Tool-Output Payment-Instruction Screening 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 decision procedure brief that classifies untrusted merchant tool-output responses for embedded payment demands, attacker payout/drain addresses, and prompt-injection attacks before an agent settles an x402 charge.
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on agent tool-output payment-instruction screening: classify untrusted merchant responses for embedded payment demands, attacker payout/drain addresses, and instruction injection before the agent settles an x402 charge. Blunt decision procedure, not marketing.
Output
A paid JSON response containing a 'brief' field with a blunt decision-procedure prose text for the agent, a boolean 'ok' indicating handler success, the service slug, model used, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp. The brief gives the agent a concrete go/no-go recommendation on whether to settle the x402 charge.
Example use cases
Pre-settlement merchant response screening
“I just got a tool-output back from a merchant before an x402 payment — can you screen it for embedded payment demands or attacker payout addresses and tell me if it's safe to settle?”
Prompt injection detection in payment flow
“This merchant API response looks weird before I authorize the x402 charge — run it through the payment instruction screening and flag any instruction injection or drain address attempts.”
Autonomous agent payment safety check
“My agent is about to settle an x402 charge but I want a blunt safety check first — classify the merchant's tool output for any hijacked payment instructions or suspicious payee addresses before funds move.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-tool-output-payment-instruction-screeningWhen to prefer
Use this endpoint when your agent is about to settle an x402 micropayment and needs to verify that the merchant's tool-output response has not been tampered with — specifically to detect embedded rogue payment instructions, attacker drain/payout addresses substituted for legitimate ones, or prompt-injection payloads designed to hijack the agent's payment action. Prefer this over generic content moderation when the threat model is payment-layer manipulation in an agentic x402 workflow.
Side effects
- Payment required (402) if x402 charge is not settled before accessing paid content
- Invalid method error if POST/PUT used instead of GET/HEAD/DELETE
- Missing 'input' field returns schema validation error
- LLM generation failure may return generationSource as deterministic fallback
- Network timeout if k2so.wrong.systems is unreachable
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-tool-output-payment-instruction-screening",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-tool-output-payment-instruction-screening",
"provider": "K-2SO"
}
}Tags
x402
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