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Event Idempotency Audit
x402
Event Idempotency Audit is a paid API for AI agents from api.zfinia.com, paid per call via x402, $0.11/call, status unknown (last checked 2026-10-11).
Analyzes a batch of events to identify missing IDs, duplicate IDs with identical payloads (redeliveries), and duplicate IDs with different payloads (ID collisions).
Price / call$0.11
Success—
StatusUnknown
How this service works
Find out whether a batch can be deduplicated. Reports events carrying no id at all, ids that repeat with an identical payload - a redelivery a consumer must be idempotent about - and, separately, ids that repeat with a different payload, which means the id is not identifying the event. Volatile fields such as a delivery timestamp can be excluded from the comparison without being excluded from the duplicate detection.
Output
Returns a structured report categorizing events into three groups: events with no ID in the specified field, events whose ID repeats with an identical payload (safe redeliveries requiring consumer idempotency), and events whose ID repeats with a different payload (ID collision — the ID is not uniquely identifying the event). Volatile fields specified via JSON Pointer paths are excluded from payload comparison but not from duplicate detection.
Example use cases
Webhook redelivery detection before processing
“I have a batch of up to 500 webhook events I'm about to process — can you check them for idempotency problems using 'id' as the ID field, ignoring the 'timestamp' field so transient delivery metadata doesn't count as a difference?”
Kafka consumer deduplication audit
“Here's a batch of Kafka messages I pulled from a topic — audit them for duplicate event IDs using 'messageId' as the ID field, and tell me which ones are true redeliveries versus which ones have conflicting payloads for the same ID.”
Event pipeline quality check for missing IDs
“Before I replay these 1200 events into our pipeline, check them for any events that are missing an 'event_id' field entirely, plus flag any ID collisions where the same ID appears with different payloads.”
Technical details
Endpoint
POSThttps://api.zfinia.com/x402/v1/event-idempotency-audit?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically classify idempotency issues in a batch of events before processing or replaying them, especially when you want to distinguish true redeliveries from ID collision bugs. It is more nuanced than a simple deduplication step because it separately identifies missing IDs, safe redeliveries, and unsafe ID reuse — and allows you to exclude volatile delivery metadata fields from payload comparison without removing them from duplicate detection altogether.
Side effects
- Batch exceeds 2000 events — request rejected
- id_field not found in any event — may return all events as missing IDs
- Invalid JSON Pointer syntax in ignore_pointers — request rejected or pointers silently ignored
- Empty events array — rejected due to minItems constraint
- Payment failure or insufficient USDC balance — 402 response before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| events | array | |
| id_field | string | |
| ignore_pointers | array |
Tags
x402
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