Cardano · Schema

Asset Onchain Metadata Cip25

On-chain metadata stored in the minting transaction under label 721, which adheres to https://cips.cardano.org/cips/cip25/

BlockchainCryptocurrencyProof of StakeSmart ContractsWeb3

Properties

Name Type Description
name string Name of the asset
image object URI(s) of the associated asset
description object Additional description
mediaType string Mime sub-type of image
files array
View JSON Schema on GitHub

JSON Schema

asset-onchain-metadata-cip25.json Raw ↑
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://cardano.blockfrost.io/schema/asset_onchain_metadata_cip25",
  "title": "Asset Onchain Metadata Cip25",
  "type": "object",
  "additionalProperties": true,
  "description": "On-chain metadata stored in the minting transaction under label 721,\nwhich adheres to https://cips.cardano.org/cips/cip25/\n",
  "properties": {
    "name": {
      "type": "string",
      "description": "Name of the asset",
      "example": "My NFT token"
    },
    "image": {
      "oneOf": [
        {
          "type": "string"
        },
        {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      ],
      "description": "URI(s) of the associated asset",
      "example": "ipfs://ipfs/QmfKyJ4tuvHowwKQCbCHj4L5T3fSj8cjs7Aau8V7BWv226"
    },
    "description": {
      "oneOf": [
        {
          "type": "string"
        },
        {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      ],
      "description": "Additional description",
      "example": "My NFT token description"
    },
    "mediaType": {
      "type": "string",
      "description": "Mime sub-type of image",
      "example": "image/jpeg"
    },
    "files": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": true,
        "properties": {
          "name": {
            "type": "string",
            "description": "Name of the file",
            "example": "myimage"
          },
          "mediaType": {
            "type": "string",
            "description": "Mime sub-type of image",
            "example": "image/jpeg"
          },
          "src": {
            "oneOf": [
              {
                "type": "string"
              },
              {
                "type": "array",
                "items": {
                  "type": "string"
                }
              }
            ],
            "description": "URI pointing to a resource of this mime type",
            "example": "My NFT token description"
          }
        },
        "required": [
          "mediaType",
          "src"
        ]
      }
    }
  },
  "required": [
    "name",
    "image"
  ]
}

Work with this as data

Every JSON Schema here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for schemas

4 MCP tools reach this
  • find_json_schemasBrowse and filter every JSON Schema in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This JSON Schema
curl "https://apis.io/api/v1/json-schemas/asset-onchain-metadata-cip25"
All schemas
curl "https://apis.io/api/v1/json-schemas?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.