Event Version Drift

Name: Event Version Drift
Price: 0.12 USDC
Availability: OutOfStock

Find out how many versions of each event type are actually in flight. Reports a type arriving at more than one version in a single batch, which means every consumer must handle all of them at once, versions outside the set you support, and supported versions nothing produces - handling carried for nothing is still a cost.

Dataofflineeip155:8453Exactvia cdp

https://api.zfinia.com/x402/v1/event-version-drift-audit

EventsVersioningMigration evidenceData contractMonitoring

Settlements · 30d

218↓ 56%

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.

$25.30

Verified settled volume

255 settlements proven x402 by their on-chain EIP-3009 marker.

$0.120

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-10-04 07:59Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0x25e8245f07d5e4873987293dad666afbe56a9608

The 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.

0.12USDC≈ $0.12 USD

on Base · exact scheme

Pay 0.12 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: 120000 smallest units

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
    "amount": "120000",
    "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"
            }
          ],
          "type_field": "type",
          "version_field": "schema_version",
          "supported_versions": {
            "order.created": [
              "2",
              "3"
            ],
            "order.cancelled": [
              "2"
            ]
          }
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "limits": {
            "maxEvents": 2000,
            "maxSchemas": 100,
            "maxFindings": 500,
            "maxAttributes": 500,
            "maxPartitions": 500,
            "cardinalityWarning": 100
          },
          "passed": false,
          "complete": true,
          "findings": [
            {
              "code": "MULTIPLE_VERSIONS_IN_FLIGHT",
              "type": "order.created",
              "detail": "order.created appears at 2 versions in one batch (1, 2), so a consumer must handle all of them simultaneously.",
              "versions": [
                "1",
                "2"
              ]
            },
            {
              "code": "UNSUPPORTED_VERSION",
              "type": "order.created",
              "detail": "order.created version 1 appears 1 time(s) and is not among the supported 2, 3.",
              "events": 1,
              "version": "1"
            },
            {
              "code": "SUPPORTED_VERSION_UNUSED",
              "type": "order.created",
              "detail": "order.created version 3 is supported and absent from the batch, so the handling for it is carried without being exercised.",
              "version": "3"
            }
          ],
          "consistent": false,
          "request_id": "example-request",
          "service_id": "event_version_drift_audit",
          "assumptions": [
            "More than one version of one event type in a single batch means a consumer must handle all of them simultaneously, which is reported whether or not every version is supported.",
            "A supported version absent from the batch is reported, because handling carried for nothing is still a cost."
          ],
          "limitations": [
            "Version distribution over the batch supplied. Whether a version is correct for its payload is event_batch_contract_audit.",
            "consistent is true only when every event declared a version, every version was supported, and no type appeared at more than one version."
          ],
          "observed_at": "2026-10-02T00:00:00.000Z",
          "combinations": [
            {
              "type": "order.created",
              "events": 4,
              "version": "2",
              "first_event": 0
            },
            {
              "type": "order.cancelled",
              "events": 2,
              "version": "2",
              "first_event": 5
            },
            {
              "type": "order.created",
              "events": 1,
              "version": "1",
              "first_event": 4
            }
          ],
          "not_examined": [],
          "finding_count": 3,
          "service_version": "1.0.0",
          "findings_by_code": {
            "UNSUPPORTED_VERSION": 1,
            "SUPPORTED_VERSION_UNUSED": 1,
            "MULTIPLE_VERSIONS_IN_FLIGHT": 1
          },
          "distinct_type_count": 2,
          "examined_event_count": 7,
          "supplied_event_count": 7,
          "events_without_version": 0,
          "distinct_combination_count": 3
        }
      }
    },
    "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",
                "version_field"
              ],
              "properties": {
                "events": {
                  "type": "array",
                  "items": {
                    "type": "object"
                  },
                  "maxItems": 2000,
                  "minItems": 1
                },
                "type_field": {
                  "type": "string",
                  "maxLength": 256
                },
                "version_field": {
                  "type": "string",
                  "maxLength": 256
                },
                "supported_versions": {
                  "type": "object"
                }
              },
              "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 07:59Z
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

Report

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.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service Event Version Drift 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%20Version%20Drift'
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-version-drift-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.