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Facilitator Preemption Attack Exposure Audit for Agent Payment Rails
x402
Facilitator Preemption Attack Exposure Audit for Agent Payment Rails 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).
Audits whether an x402 payment facilitator can front-run, preempt, reorder, or suppress an agent's transactions, returning an exposure verdict and mitigations per attack class.
Price / call$0.002
Success—
StatusDown
How this service works
Audit procedure for whether an agent's payment facilitator can front-run, preempt, or reorder agent transactions on x402 rails. Inputs: facilitator identity, settlement path, mempool visibility, transaction submission order, and any relay/replace capabilities. Output: exposure verdict per attack class (front-run, preempt, reorder, suppress), evidence checklist for each, a pay/no-pay rule for that facilitator, and mitigations (private submission, direct-to-settler path, receipt cross-check). For
Output
Returns a JSON object containing an exposure verdict for each attack class (front-run, preempt, reorder, suppress), an evidence checklist for each class, a pay/no-pay rule for the facilitator, and concrete mitigations such as private submission channels, direct-to-settler routing, and receipt cross-checking. The response includes a prose decision procedure (120+ words) and metadata including generation source and timestamp.
Example use cases
Vetting a new x402 facilitator before deployment
“Before I go live with this facilitator on x402 rails, can you audit it for front-running and transaction suppression risk and give me a pay/no-pay verdict with an evidence checklist?”
Investigating suspected transaction reordering
“My agent's payments seem to be arriving out of order — can you check whether my current facilitator has mempool visibility and the ability to reorder or preempt my transactions, and suggest mitigations if so?”
Hardening agent payment pipeline against preemption
“I want to harden my autonomous agent's payment pipeline against facilitator preemption attacks — audit the settlement path and relay capabilities of my facilitator and tell me what private submission or direct-to-settler options I should adopt.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/facilitator-preemption-attack-exposure-audit-for?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to evaluate a specific x402 payment facilitator's trustworthiness before routing funds, especially when operating unattended and unable to manually verify transaction ordering integrity. Prefer this over generic blockchain security audits when the concern is specifically facilitator-level MEV-style attacks on x402 rails.
Side effects
- Insufficient input about facilitator identity or settlement path may yield an inconclusive verdict
- Mempool visibility data not provided may result in incomplete front-run exposure assessment
- If the facilitator is unknown or unlisted, the evidence checklist may be sparse
- LLM-generated procedures may reflect training cutoff rather than latest protocol changes
- Network or payment failure returns no verdict
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": "facilitator-preemption-attack-exposure-audit-for",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "facilitator-preemption-attack-exposure-audit-for",
"provider": "K-2SO"
}
}Tags
x402
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