Api Endpoint

agent-tools-7936.onrender.com

Use before citing a paper, especially one an LLM produced: checks a DOI, arXiv id or title against Crossref, OpenAlex and arXiv. VERIFIED, RETRACTED, YEAR_DIFFERS, MISMATCH or NOT_FOUND, with the matching record. Errors (never charged): 400 bad input, 422 source could not be fetched or parsed, 429 rate limited (30/min), 502 upstream failed.

Open interactive test console

Offering

Provider: agent-tools-7936.onrender.com
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Science And Education
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://agent-tools-7936.onrender.com/verify/citation
MIME type: application/json
First seen: 2026-10-16T01:52:40.118Z
Last seen: 2026-11-01T19:24:08.131Z
Tags: None supplied

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.003 USDC
Atomic price: 3000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "payTo": "0xb3Ecf17DDDeAeBdd16B3EBfAA79dC76347E98735"
  }
]

Observed health

Status: Healthy
Latest latency: 1216 ms
Average latency: 777 ms
HTTP status: 402
Last checked: 2026-11-01T19:24:08.126Z
Reachability: 100% over 11 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET",
        "HEAD",
        "DELETE"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "doi": {
          "type": "string",
          "description": "DOI, e.g. 10.1038/nature14539."
        },
        "arxiv": {
          "type": "string",
          "description": "arXiv id, e.g. 1706.03762."
        },
        "title": {
          "type": "string",
          "description": "Paper title if there is no DOI."
        },
        "authors": {
          "type": "string",
          "description": "Author surnames."
        },
        "year": {
          "type": "string",
          "description": "Cited year."
        }
      },
      "required": []
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET",
            "HEAD",
            "DELETE"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "arxiv": {
              "description": "arXiv id, e.g. 1706.03762.",
              "type": "string"
            },
            "authors": {
              "description": "Author surnames.",
              "type": "string"
            },
            "doi": {
              "description": "DOI, e.g. 10.1038/nature14539.",
              "type": "string"
            },
            "title": {
              "description": "Paper title if there is no DOI.",
              "type": "string"
            },
            "year": {
              "description": "Cited year.",
              "type": "string"
            }
          },
          "required": [],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "properties": {
            "record": {
              "type": "object"
            },
            "verdict": {
              "type": "string"
            }
          },
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}