Index onlineMerchant portal
Api Endpoint

Evidence402

Check up to ten DOI citations against source registries, compare optional titles, and expose publication update signals. Use to detect incorrect references.

Open interactive test console

Offering

Provider
evidence402.onrender.com
Method
POST
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://evidence402.onrender.com/api/v1/verify
MIME type
Not provided
First seen
2026-10-16T01:50:38.788Z
Last seen
Tags
Research, citations, Science

Website

Payment pricing

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

Payment option 1
0.02 USDC
Atomic price: 20000 · Network: eip155:84532 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:84532",
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "amount": "20000",
    "payTo": "0xc60674058497BfcD73a1b74aCc46B66E1AE5176D"
  }
]

Observed health

Status
Reachable
Latest latency
128 ms
Average latency
342 ms
HTTP status
405
Last checked
Reachability
100% over 7 checks

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

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "additionalProperties": false,
      "properties": {
        "citations": {
          "items": {
            "additionalProperties": false,
            "properties": {
              "doi": {
                "maxLength": 200,
                "minLength": 7,
                "type": "string"
              },
              "title": {
                "maxLength": 500,
                "minLength": 3,
                "type": "string"
              }
            },
            "required": [
              "doi"
            ],
            "type": "object"
          },
          "maxItems": 10,
          "minItems": 1,
          "type": "array"
        }
      },
      "required": [
        "citations"
      ],
      "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 schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "additionalProperties": false,
          "properties": {
            "citations": {
              "items": {
                "additionalProperties": false,
                "properties": {
                  "doi": {
                    "maxLength": 200,
                    "minLength": 7,
                    "type": "string"
                  },
                  "title": {
                    "maxLength": 500,
                    "minLength": 3,
                    "type": "string"
                  }
                },
                "required": [
                  "doi"
                ],
                "type": "object"
              },
              "maxItems": 10,
              "minItems": 1,
              "type": "array"
            }
          },
          "required": [
            "citations"
          ],
          "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": {
          "properties": {
            "data": {
              "properties": {
                "citations": {
                  "items": {
                    "type": "object"
                  },
                  "type": "array"
                }
              },
              "type": "object"
            },
            "requestId": {
              "type": "string"
            },
            "service": {
              "type": "string"
            }
          },
          "required": [
            "requestId",
            "service",
            "data"
          ],
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}