Audit newline-delimited JSON logs against a contract, and across the whole set

Audit newline-delimited JSON logs against a contract, and across the whole set. The two findings that need every line at once: a field whose type varies between lines, so an index either rejects the minority or coerces them silently; and a message field with nearly as many distinct values as lines, which is interpolated rather than templated so nothing groups and cost scales with volume. Also reports absent required fields, a level differing only in case, and a timestamp with no offset.

Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.

Endpoint

POST https://api.zfinia.com/x402/v1/log-schema-contract-audit

Our checks, last 30 days

Example input (from the provider)

{
  "body": {
    "contract": {
      "field_types": {
        "duration_ms": "number",
        "status": "number"
      },
      "permitted_levels": [
        "debug",
        "info",
        "warn",
        "error"
      ],
      "require_timestamp_offset": true,
      "required_fields": [
        "timestamp",
        "level",
        "message",
        "service"
      ]
    },
    "logs": "{\"timestamp\":\"2026-10-02T12:00:00.000Z\",\"level\":\"info\",\"message\":\"request completed\",\"status\":200,\"duration_ms\":12}\n{\"timestamp\":\"2026-10-02T12:00:01.000Z\",\"level\":\"ERROR\",\"message\":\"request failed for order 8827341 after 3 retries\",\"status\":500,\"duration_ms\":\"940\"}\n{\"timestamp\":\"2026-10-02T12:00:02.000Z\",\"level\":\"info\",\"message\":\"request failed for order 8827342 after 1 retries\",\"status\":500,\"duration_ms\":880}\n{\"timestamp\":\"2026-10-02 12:00:03.000\",\"level\":\"warn\",\"message\":\"request failed for order 8827343 after 2 retries\",\"status\":503}\n{\"timestamp\":\"2026-10-02T12:00:04.000Z\",\"level\":\"info\",\"message\":\"request failed for order 8827344 after 1 retries\",\"status\":500,\"duration_ms\":790}\n{\"level\":\"info\",\"message\":\"request failed for order 8827345 after 4 retries\",\"status\":500,\"duration_ms\":1200}\n{\"timestamp\":\"2026-10-02T12:00:06.000Z\",\"level\":\"info\",\"message\":\"request failed for order 8827346 after 2 retries\",\"status\":500,\"duration_ms\":810}\n{\"timestamp\":\"2026-10-02T12:00:07.000Z\",\"level\":\"info\",\"message\":\"request failed for order 8827347 after 1 retries\",\"status\":500,\"duration_ms\":760}\n{\"timestamp\":\"2026-10-02T12:00:08.000Z\",\"level\":\"info\",\"message\":\"request failed for order 8827348 after 3 retries\",\"status\":500,\"duration_ms\":920}\n{\"timestamp\":\"2026-10-02T12:00:09.000Z\",\"level\":\"info\",\"message\":\"request failed for order 8827349 after 1 retries\",\"status\":500,\"duration_ms\":700}\n{not json at all"
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "additionalProperties": false,
          "properties": {
            "contract": {
              "additionalProperties": false,
              "properties": {
                "field_types": {
                  "type": "object"
                },
                "level_field": {
                  "maxLength": 128,
                  "type": "string"
                },
                "message_field": {
                  "maxLength": 128,
                  "type": "string"
                },
                "permitted_levels": {
                  "items": {
                    "type": "string"
                  },
                  "maxItems": 50,
                  "minItems": 1,
                  "type": "array"
                },
                "require_timestamp_offset": {
                  "type": "boolean"
                },
                "required_fields": {
                  "items": {
                    "maxLength": 256,
                    "type": "string"
                  },
                  "maxItems": 500,
                  "minItems": 1,
                  "type": "array"
                },
                "timestamp_field": {
                  "maxLength": 128,
                  "type": "string"
                }
              },
              "type": "object"
            },
            "logs": {
              "maxLength": 2097152,
              "type": "string"
            }
          },
          "required": [
            "logs",
            "contract"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}

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