Payload Check

Payload Check: data-quality filter for agents. Send any payload (tool/API output, scraped page, LLM answer, generated code, JSON, CSV) and get a 0-100 quality score, pass/warn/fail, tags and concrete issues: invalid or truncated JSON (with auto-repair), JSON Schema mismatches, syntax errors, bot-challenge/captcha/404 scrapes, LLM refusals, placeholders, repetition loops, mojibake. Deterministic, no LLM, payload not stored.

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

GET https://seenly-payload-check.vercel.app/api/check

Our checks, last 30 days

We never call tools that send, buy, move money or file anything, not even without paying.

Example input (from the provider)

{
  "body": {
    "content": "```json\n{\"name\": \"Acme Widget\", \"price\": 12.5, \"tags\": [\"tools\", \"home\",], \"sku\": \"N/A\"}\n```",
    "expect": "auto"
  },
  "bodyType": "json",
  "method": "GET",
  "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": {
            "content": {
              "description": "The payload to check (max 256 KB): JSON (even broken), code, scraped text or HTML, CSV, an LLM answer. Objects/arrays are accepted and checked as JSON.",
              "type": "string"
            },
            "expect": {
              "default": "auto",
              "description": "What the payload should be. auto detects it.",
              "enum": [
                "auto",
                "json",
                "code",
                "text",
                "html",
                "csv"
              ],
              "type": "string"
            },
            "language": {
              "description": "Optional code language (javascript, typescript, jsx, tsx get a real parser; python, go, rust, sql, shell get structural checks).",
              "type": "string"
            },
            "min_chars": {
              "description": "Optional minimum length for text payloads.",
              "minimum": 0,
              "type": "integer"
            },
            "min_score": {
              "default": 80,
              "description": "Score at or above which the verdict is pass (fail is always < 45 or any critical issue).",
              "maximum": 100,
              "minimum": 0,
              "type": "number"
            },
            "repair": {
              "default": true,
              "description": "Try a conservative mechanical repair of broken JSON and return it.",
              "type": "boolean"
            },
            "requestKey": {
              "description": "Optional idempotency key, echoed back.",
              "maxLength": 128,
              "type": "string"
            },
            "schema": {
              "description": "Optional JSON Schema (draft-07/2019) the JSON payload must match.",
              "type": "object"
            }
          },
          "required": [
            "content"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "GET"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "properties": {
            "action": {
              "type": "string"
            },
            "detected_type": {
              "enum": [
                "json",
                "code",
                "text",
                "html",
                "csv"
              ],
              "type": "string"
            },
            "issues": {
              "items": {
                "properties": {
                  "code": {
                    "type": "string"
                  },
                  "location": {
                    "type": "string"
                  },
                  "message": {
                    "type": "string"
                  },
                  "severity": {
                    "enum": [
                      "critical",
                      "major",
                      "minor",
                      "info"
                    ],
                    "type": "string"
                  }
                },
                "type": "object"
              },
              "type": "array"
            },
            "quality_score": {
              "description": "100 = clean. Critical issue -60, major -25, minor -8.",
              "maximum": 100,
              "minimum": 0,
              "type": "integer"
            },
            "repaired": {
              "description": "Only for broken-but-fixable JSON: content (fixed JSON string), steps[].",
              "type": "object"
            },
            "stats": {
              "type": "object"
            },
            "tags": {
              "description": "e.g. invalid_json, truncated, schema_mismatch, scrape_failure, bot_challenge, llm_refusal, placeholder, repetitive, syntax_error, empty, clean",
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "usable": {
              "type": "boolean"
            },
            "verdict": {
              "enum": [
                "pass",
                "warn",
                "fail"
              ],
              "type": "string"
            }
          },
          "required": [
            "quality_score",
            "verdict",
            "usable",
            "tags",
            "issues"
          ],
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}

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