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Nova Retail Context Delta
x402
Nova Retail Context Delta is a paid API for AI agents from nova-retail-controlled-proof.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).
Submits a context delta update for a retail session, capturing incremental state changes in a retail context resource
Price / call$0.02
Success—
StatusUnknown
How this service works
Nova retail context_delta context resource
Output
Returns an acknowledgment confirming the context delta was received and applied, along with the updated context state or a confirmation identifier for the delta event.
Example use cases
Cart state change tracking
“Record a context delta for the retail session showing that the customer just added item SKU 'JACKET-BLU-M' to their cart and the total item count went from 1 to 3.”
Product selection context update
“Send a delta update to the Nova retail context resource indicating the user switched their selected product from 'BOOT-BRN-10' to 'BOOT-BRN-11' during this retail session.”
Checkout step progression sync
“Submit a retail context delta showing the session moved from the 'browsing' step to the 'checkout' step after the customer clicked buy for order session ID 'sess-20240812-retail'.”
Technical details
Endpoint
POSThttps://nova-retail-controlled-proof.onrender.com/retail/v1/context/context-delta?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to submit incremental, differential state changes to a retail context resource rather than replacing the full state. It is suited for event-driven retail workflows where only changed fields need to be pushed, keeping payloads small and efficient.
Side effects
- Invalid or missing context delta payload returns a 400 error
- Session or context identifier not found returns a 404
- Payment not included or invalid x402 payment header returns a 402
- Malformed delta structure results in rejection
- Service unavailable on Render cold start returns a 503
Output
Schema · Response
{
"type": "json",
"example": {
"subject": {
"label": "BTC/USD",
"subject_id": "BTC-USD",
"subject_type": "market_pair"
},
"limitations": [],
"resource_id": "context-delta-91e9a7267ab3fcdce8fe8f66",
"delta_status": "changed",
"generated_at": "2026-09-12T12:00:00Z",
"resource_type": "context_delta",
"schema_version": "0.1.0",
"authority_effect": "none",
"material_changes": [
{
"field": "observed_at",
"item_id": null,
"category": "freshness",
"change_id": "material-change-aad59f135d32b8e6cfb9f8e3",
"change_type": "value_changed",
"current_value": "2026-09-12T12:00:00Z",
"previous_value": "2026-09-12T11:55:00Z"
},
{
"field": "observed_at",
"item_id": "public-example-source",
"category": "provenance",
"change_id": "material-change-ee1ca54c09fa66775144e3a4",
"change_type": "value_changed",
"current_value": "2026-09-12T12:00:00Z",
"previous_value": "2026-09-12T11:55:00Z"
},
{
"field": "content",
"item_id": "public-example-last-price",
"category": "evidence",
"change_id": "material-change-f712bc18f08980ebc25df088",
"change_type": "content_changed",
"current_value": "{\"claim_or_observation\":\"last_price=100100 BTC-USD\",\"evidence_id\":\"public-example-last-price\",\"source_id\":\"public-example-source\"}",
"previous_value": "{\"claim_or_observation\":\"last_price=100000 BTC-USD\",\"evidence_id\":\"public-example-last-price\",\"source_id\":\"public-example-source\"}"
}
],
"freshness_changes": [
{
"field": "observed_at",
"change_id": "freshness-change-ebecda1fcbfb3c08e114de17",
"current_value": "2026-09-12T12:00:00Z",
"previous_value": "2026-09-12T11:55:00Z"
}
],
"confidence_changes": [],
"current_context_id": "state-ping-example-current",
"limitation_changes": [],
"provenance_changes": [
{
"field": "observed_at",
"change_id": "provenance-change-c14455d3e5b633ef90196215",
"source_id": "public-example-source",
"change_type": "observed_at_changed",
"current_value": "2026-09-12T12:00:00Z",
"previous_value": "2026-09-12T11:55:00Z"
}
],
"previous_context_id": "state-ping-example-previous",
"contradiction_changes": [],
"evidence_state_changes": [
{
"change_id": "evidence-change-d18b1a54a0b68c6855212169",
"source_id": "public-example-source",
"change_type": "content_changed",
"evidence_id": "public-example-last-price",
"current_status": "observed",
"previous_status": "observed"
}
],
"unresolved_evidence_changes": []
}
}Tags
x402
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