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Subscription Billing Acceptance Standard for Merchant Agents
x402
Subscription Billing Acceptance Standard for Merchant 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 an accept/conditional/reject decision on a proposed recurring-billing subscription agreement under x402/MPP, checking cancel path, price-change notice windows, and first-charge settlement proof.
Price / call$0.002
Success—
StatusDown
How this service works
Deterministic acceptance gate for merchant agents offered recurring billing via x402/MPP. Given a proposed subscription agreement (cadence, price anchor, auto-renew terms, cancel path, refund window), the procedure returns accept / conditional / reject. It requires an on-rail cancel path that the payer can trigger without merchant consent, a fixed billing anchor with a 7-day (monthly) or 30-day (annual) price-change notice window, proof that the first charge actually settled as a normal x402
Output
A JSON response containing an ok flag, a paid confirmation, and a result object with a boolean success indicator, a plain-prose 'brief' explaining the decision procedure (120+ words), the acceptance outcome (accept/conditional/reject logic embedded in the procedure), an ISO-8601 generatedAt timestamp, the generation source (llm, reasoning, or deterministic), and the service slug and provider (K-2SO).
Example use cases
Vetting a new recurring billing offer
“I've received a proposed monthly subscription agreement from a new merchant — cadence is monthly, they claim there's an on-rail cancel path and a 7-day price-change notice, and the first charge settled as a normal x402 payment. Can you evaluate this against the subscription billing acceptance standard and tell me if I should accept, reject, or ask for changes?”
Checking auto-renew term compliance before agent onboarding
“Before I onboard this merchant for recurring auto-renew payments, I want to verify their subscription terms meet the x402 MPP standard — specifically that payers can cancel without merchant consent and the annual price-change window is at least 30 days. Can you run the acceptance gate and give me the decision?”
Flagging a conditional subscription with refund window issues
“This subscription proposal has auto-renew enabled but I'm not sure the refund window and cancel path are compliant with x402 merchant billing standards — can you put it through the acceptance procedure and tell me whether it comes back as conditional or outright rejected?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/subscription-billing-acceptance-standard-for-mer?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous merchant agent needs a deterministic, standards-based gate before accepting a recurring billing arrangement under x402/MPP — particularly when you need structured accept/conditional/reject logic that checks on-rail cancel path availability, price-change notice windows (7-day monthly / 30-day annual), and settled first-charge proof. Prefer this over manual review or generic policy checks when operating unattended and need a reproducible decision trace with prose rationale.
Side effects
- Missing or malformed subscription agreement input yields an error or empty decision
- Unpaid request (no valid x402 payment header) returns a 402 Payment Required response
- Invalid topic override parameter causes fallback to default procedure
- Network or provider-side timeout results in no result object returned
- First-charge settlement proof not verifiable leads to conditional or reject outcome
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": "subscription-billing-acceptance-standard-for-mer",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "subscription-billing-acceptance-standard-for-mer",
"provider": "K-2SO"
}
}Tags
x402
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