Index onlineMerchant portal
Api Endpoint

DOI metadata and citation

Metadata of a publication by DOI (Crossref): title, authors, journal or publisher, year, type, citation count, references, license, link and an APA-formatted citation.

Open interactive test console

Offering

Provider
api.vextorium.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://api.vextorium.com/v1/doi-info
MIME type
application/json
First seen
2026-10-16T01:51:10.599Z
Last seen
Tags
doi, citation, crossref, Research, academic

Website

Payment pricing

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

Payment option 1
0.002 USDC
Atomic price: 2000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.002 USDC
Atomic price: 2000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Payment option 3
1540 atomic units
Atomic price: 1540 · Network: xrpl:0 · Asset: XRP · Scheme: exact
Payment option 4
0.002 USDC
Atomic price: 2000 · Network: eip155:137 · Asset: USDC · Scheme: exact
Payment option 5
0.002 USDC
Atomic price: 2000 · Network: eip155:10 · Asset: USDC · Scheme: exact
Payment option 6
2000 atomic units
Atomic price: 2000 · Network: eip155:5042 · Asset: 0x3600000000000000000000000000000000000000 · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "2000",
    "payTo": "HcjfmZLgWRZzwj4deEiS7pewc4KBYSw39mW5nTyt3pz2"
  },
  {
    "scheme": "exact",
    "network": "xrpl:0",
    "asset": "XRP",
    "amount": "1540",
    "payTo": "rEac5rTEr7y81iEyrMTrHCRbnktSE2pNCp"
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "2000",
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf"
  },
  {
    "scheme": "exact",
    "network": "eip155:10",
    "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
    "amount": "2000",
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf"
  },
  {
    "scheme": "exact",
    "network": "eip155:5042",
    "asset": "0x3600000000000000000000000000000000000000",
    "amount": "2000",
    "payTo": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf"
  }
]

Observed health

Status
Healthy
Latest latency
1372 ms
Average latency
1468 ms
HTTP status
200
Last checked
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": [
        "POST"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "properties": {
        "doi": {
          "type": "string"
        }
      },
      "required": [
        "doi"
      ]
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": [
        "object",
        "null"
      ],
      "properties": {
        "doi": {
          "type": [
            "string",
            "null"
          ]
        },
        "title": {
          "type": [
            "string",
            "null"
          ]
        },
        "authors": {
          "type": [
            "array",
            "null"
          ],
          "items": {
            "type": [
              "null",
              "string"
            ]
          }
        },
        "journal": {
          "type": [
            "string",
            "null"
          ]
        },
        "editorial": {
          "type": [
            "string",
            "null"
          ]
        },
        "year": {
          "type": [
            "number",
            "null"
          ]
        },
        "type": {
          "type": [
            "string",
            "null"
          ]
        },
        "volume": {
          "type": [
            "string",
            "null"
          ]
        },
        "number": {
          "type": [
            "string",
            "null"
          ]
        },
        "pages": {
          "type": [
            "string",
            "null"
          ]
        },
        "citations": {
          "type": [
            "number",
            "null"
          ]
        },
        "references": {
          "type": [
            "number",
            "null"
          ]
        },
        "license": {
          "type": [
            "array",
            "null"
          ],
          "items": {
            "type": [
              "null",
              "string"
            ]
          }
        },
        "link": {
          "type": [
            "string",
            "null"
          ]
        },
        "apa_citation": {
          "type": [
            "string",
            "null"
          ]
        },
        "source": {
          "type": [
            "string",
            "null"
          ]
        }
      }
    }
  },
  "required": [
    "type"
  ]
}