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Payment Verification Threshold and Billing Model Selector
x402
Payment Verification Threshold and Billing Model Selector 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 2026-10-16).
Returns a decision procedure and JSON schema for x402 merchants choosing among pay-per-verified-call, subscription credits, or hybrid billing models, including failed-attempt handling rules.
Price / call$0.002
Success—
StatusUnknown
How this service works
Decision procedure and JSON schema for x402 merchants choosing between pay-per-verified-call, subscription credits, or hybrid billing. Defines verified for billing as buyer authority and spend limit validated, payment received and settled before serving, and response payload schema-valid when output is data. Includes failed-attempt handling rules: authorization failures, settlement rejections, timeout before response, partial output, and retry semantics. Retries are billable only after a
Output
Returns a JSON object with a decision procedure prose brief for agents, the selected billing model slug, a topic label, an ISO-8601 timestamp of generation, and the generation source (llm, reasoning, or deterministic), along with payment confirmation fields (ok, paid, provider, service).
Example use cases
Choosing billing model for data API
“I'm launching a paid data API on x402 and I'm not sure whether to charge per verified call or use subscription credits — can you get me the decision procedure so I can figure out which model makes sense for my use case?”
Handling failed payment attempts policy
“My x402 merchant endpoint sometimes gets authorization failures and settlement timeouts — can you pull up the billing rules for how to handle those failed attempts and whether retries should be charged?”
Verifying hybrid billing configuration
“I want to set up a hybrid billing model for my x402 service where some calls are pay-per-verified-call and others use subscription credits — can you fetch the verification threshold and billing selector procedure to confirm what counts as a verified call before I go live?”
Technical details
Endpoint
GEThttps://k2so-8080.on.ascii.dev/api/services/merchant-billing-model-selection-verified-call-c?utm_source=zero.xyzWhen to prefer
Use this endpoint when you are an x402 merchant or developer building a paid API and need authoritative, schema-validated guidance on which billing model (pay-per-verified-call, subscription credits, or hybrid) best fits your payment and settlement requirements. Prefer this over generic documentation when you need machine-readable decision logic including failed-attempt handling and retry semantics integrated into an agent workflow.
Side effects
- Authorization failure returns an error result with ok:false and no billing model selected
- Settlement rejection causes the procedure to return a failed-attempt rule set rather than a billing recommendation
- Timeout before response may result in incomplete output with partial procedure data
- Invalid or unsupported topic override causes the procedure to fall back to default decision logic
- Payment not received causes the endpoint to reject without serving the decision procedure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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