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Overview

Vayu event ingestion supports idempotency via the ref field on each event. If you send the same event twice with the same ref, Vayu processes it only once — the second submission is a no-op and returns the original result. This is critical for reliable integrations: if a network timeout leaves you uncertain whether a request was received, you can safely retry without double-counting usage.

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How to use ref

Include a unique ref value on every event. Use a stable identifier from your own system — a database row ID, a transaction ID, or a UUID you generate and store before sending. 
{
  "events": [
    {
      "name": "api_call",
      "ref": "txn_a1b2c3d4e5f6",
      "customerAlias": "customer-123",
      "timestamp": "2026-01-15T14:30:00Z",
      "data": {
        "endpoint": "/v1/predict",
        "tokens": 1500
      }
    }
  ]
}

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Rules

  • ref must be unique per event name within your account
  • ref values are stored permanently — a ref used for a deleted event cannot be reused
  • If you omit ref, no idempotency protection applies to that event
  • The idempotency window is permanent (not time-bounded)

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Duplicate detection in the response

Duplicate ref values are returned in the invalidEvents array: 
{
  "validEvents": [],
  "invalidEvents": [
    {
      "event": { "ref": "txn_a1b2c3d4e5f6" },
      "error": "Event with ref txn_a1b2c3d4e5f6 already exists"
    }
  ]
}

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Best practice: generate ref before sending

Always generate and persist your ref before the API call. If the call fails before a response arrives, retry with the same ref safely. 
const ref = `txn_${uuid()}`;
await db.pendingEvents.insert({ ref, ...eventData });
await vayu.events.ingest([{ ref, ...eventData }]);
await db.pendingEvents.markSent(ref);