Event Sequence Audit
Find gaps, duplicates and ordering violations in an event sequence, per stream. Partitioning matters: auditing a merged multi-stream batch as one sequence would report a gap at every interleave. Gaps are judged on sequence values and ordering on arrival order, because they are different questions. A non-integral sequence is reported as unchecked for contiguity rather than guessed at.
Tradingofflineeip155:8453Exactvia cdp
EventsSequence integrityStreamingData qualityMonitoring
Settlements · 30d
219↓ 38%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$25.35
Verified settled volume
256 settlements proven x402 by their on-chain EIP-3009 marker.
$0.130
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-04 08:00Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x25e8245f07d5e4873987293dad666afbe56a9608The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.13USDC≈ $0.13 USD
on Base · exact scheme
Pay 0.13 USDC on Base to 0x25e8…a9608. The signed payment is good for 1 minute.
- Paid to
- 0x25e8…a9608
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 130000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "130000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"events": [
{
"type": "order.created",
"total": 42.5,
"offset": 101,
"stream": "orders-0",
"event_id": "evt-1",
"order_id": "o-1",
"schema_version": "2"
},
{
"type": "order.created",
"total": 19.99,
"offset": 102,
"stream": "orders-0",
"event_id": "evt-2",
"order_id": "o-2",
"schema_version": "2"
},
{
"type": "order.created",
"total": 7,
"offset": 104,
"stream": "orders-0",
"event_id": "evt-4",
"order_id": "o-4",
"schema_version": "2"
},
{
"type": "order.created",
"total": 7.5,
"offset": 105,
"stream": "orders-0",
"event_id": "evt-4",
"order_id": "o-4",
"schema_version": "2"
},
{
"type": "order.created",
"total": "12.00",
"offset": 106,
"stream": "orders-0",
"event_id": "evt-5",
"order_id": "o-5",
"schema_version": "1"
},
{
"type": "order.cancelled",
"offset": 1,
"reason": "customer",
"stream": "orders-1",
"event_id": "evt-6",
"order_id": "o-1",
"schema_version": "2"
},
{
"type": "order.cancelled",
"offset": 2,
"reason": "fraud",
"stream": "orders-1",
"order_id": "o-2",
"schema_version": "2"
}
],
"sequence_field": "offset",
"partition_field": "stream"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"intact": false,
"limits": {
"maxEvents": 2000,
"maxSchemas": 100,
"maxFindings": 500,
"maxAttributes": 500,
"maxPartitions": 500,
"cardinalityWarning": 100
},
"passed": false,
"complete": true,
"findings": [
{
"code": "SEQUENCE_GAP",
"event": 2,
"detail": "Partition orders-0: 102 is followed by 104, so 1 value(s) are missing.",
"missing": 1,
"partition": "orders-0"
}
],
"gap_count": 1,
"partitions": [
{
"last": 106,
"first": 101,
"events": 5,
"partition": "orders-0"
},
{
"last": 2,
"first": 1,
"events": 2,
"partition": "orders-1"
}
],
"request_id": "example-request",
"service_id": "event_sequence_integrity_audit",
"assumptions": [
"A sequence is only meaningful inside the stream that produced it, so without a partition field the whole batch is treated as one stream. Auditing a merged multi-partition batch as one sequence would r...",
"Contiguity is only checked between integral sequence values; a non-integral sequence is reported as unchecked rather than guessed at.",
"Ordering is judged on the order events appear in the batch, and gaps on their values. They are different questions and are reported separately."
],
"limitations": [
"Sequence integrity only. Whether the events themselves are valid is event_batch_contract_audit.",
"intact is true only when every event was placed and no gap, duplicate or ordering violation was found."
],
"observed_at": "2026-10-02T00:00:00.000Z",
"not_examined": [],
"finding_count": 1,
"duplicate_count": 0,
"partition_count": 2,
"service_version": "1.0.0",
"findings_by_code": {
"SEQUENCE_GAP": 1
},
"out_of_order_count": 0,
"examined_event_count": 7,
"supplied_event_count": 7,
"unsequenced_event_count": 0
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"events",
"sequence_field"
],
"properties": {
"events": {
"type": "array",
"items": {
"type": "object"
},
"maxItems": 2000,
"minItems": 1
},
"sequence_field": {
"type": "string",
"maxLength": 256
},
"partition_field": {
"type": "string",
"maxLength": 256
},
"expect_contiguous": {
"type": "boolean"
},
"expect_increasing": {
"type": "boolean"
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-04 08:00Z
- Last indexed by Roundhouse
- 2026-10-05 00:20Z
- Last enriched (probe, favicon, geo)
- 2026-10-04 11:15Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 0
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Event Sequence Audit and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Event%20Sequence%20Audit' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.zfinia.com/x402/v1/event-sequence-integrity-audit, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.