ConditionCheck

x402

ConditionCheck is a paid API for AI agents from conditioncheck-mainnet-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Checks whether a specific factual condition is currently true on a given public webpage, returning a yes/no answer with supporting evidence.

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Paid x402 API that checks whether a factual condition is currently true on a public webpage.

Output

A JSON object containing a boolean 'condition_met' field, a plain-language 'answer' (Yes/No), an array of 'evidence' strings quoting relevant text found on the page, a 'confidence' score between 0 and 1, the 'source_url' that was checked, a 'checked_at' ISO timestamp, and an 'observed_values' array of named key-value pairs extracted from the page (e.g. price, stock status).

Example use cases

E-commerce stock availability check

“Is the Nike Air Max 270 in size 10 still in stock? Check https://www.nike.com/t/air-max-270-mens-shoes/AH8050-002 and confirm whether the condition 'size 10 is available to purchase' is true right now.”

Price threshold verification

“Can you check https://www.bestbuy.com/site/samsung-65-class-qled-4k-tv/6401722.p and verify the condition 'the listed sale price is under $800'? I want to know if it's true with what evidence the page shows.”

Event registration deadline check

“Please check https://devcon.org/en/tickets/ and verify whether the condition 'early bird ticket registration is still open' is currently true — I need to know before I decide to sign up today.”

Technical details

Endpoint

POSThttps://conditioncheck-mainnet-production.up.railway.app/check?utm_source=zero.xyz

When to prefer

Choose ConditionCheck when you need a structured, evidence-backed true/false answer about a specific factual condition on a public webpage — especially for price checks, stock availability, status verification, or deadline monitoring. It is preferable over generic web scrapers when you need not just raw content but a validated boolean answer with confidence scoring and cited evidence. Best suited for single-page spot checks rather than broad site crawls.

Side effects

URL is not publicly accessible or requires authentication — returns error or low-confidence result
Condition is ambiguous or too broad — may return low confidence or inconclusive answer
Page uses heavy JavaScript rendering that prevents content access — evidence may be incomplete
Condition references information not present on the specified page — answer may be No with no supporting evidence
Malformed URL input — returns validation error
Page content has changed between request and evidence extraction — timestamp helps detect staleness

Input

Schema · Request body

Field	Type	Description
url	string	Public http(s) page to inspect
condition	string	A factual condition to evaluate from the current page, such as price, stock, deadline, or status

Output

Schema · Response

{
  "type": "json",
  "example": {
    "answer": "Yes",
    "evidence": [
      "Price shown: $479",
      "Status shown: In stock"
    ],
    "checked_at": "2026-10-08T13:00:00.000Z",
    "confidence": 0.98,
    "source_url": "https://example.com/product",
    "condition_met": true,
    "observed_values": [
      {
        "name": "price",
        "value": "$479"
      },
      {
        "name": "stock",
        "value": "In stock"
      }
    ]
  }
}

Reviews

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How this service works

Paid x402 API that checks whether a factual condition is currently true on a public webpage.

Output

Example use cases

E-commerce stock availability check

Price threshold verification

Event registration deadline check

Technical details

Endpoint

POSThttps://conditioncheck-mainnet-production.up.railway.app/check?utm_source=zero.xyz

When to prefer

Side effects

URL is not publicly accessible or requires authentication — returns error or low-confidence result
Condition is ambiguous or too broad — may return low confidence or inconclusive answer
Page uses heavy JavaScript rendering that prevents content access — evidence may be incomplete
Condition references information not present on the specified page — answer may be No with no supporting evidence
Malformed URL input — returns validation error
Page content has changed between request and evidence extraction — timestamp helps detect staleness

Input

Schema · Request body

Field	Type	Description
url	string	Public http(s) page to inspect
condition	string	A factual condition to evaluate from the current page, such as price, stock, deadline, or status

Output

Schema · Response

{
  "type": "json",
  "example": {
    "answer": "Yes",
    "evidence": [
      "Price shown: $479",
      "Status shown: In stock"
    ],
    "checked_at": "2026-10-08T13:00:00.000Z",
    "confidence": 0.98,
    "source_url": "https://example.com/product",
    "condition_met": true,
    "observed_values": [
      {
        "name": "price",
        "value": "$479"
      },
      {
        "name": "stock",
        "value": "In stock"
      }
    ]
  }
}