Index onlineMerchant portal
Api Endpoint

book-record

Validate one ISBN checksum and return its Open Library edition, work and author records projected into one sourced CSL-JSON book item; invalid or absent ISBNs return an explicit refusal. The FOUR truth reading is true when found and neither on refusal.

Open interactive test console

Offering

Provider
market.561.group
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://market.561.group/v1/book-record
MIME type
Not provided
First seen
2026-10-16T01:50:38.788Z
Last seen
Tags
bibliography, books, isbn, csl-json, open-library

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
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "payTo": "0x32886F6F361C1d570255c2762967A2e41D0E9B1a"
  }
]

Observed health

Status
Healthy
Latest latency
51 ms
Average latency
1318 ms
HTTP status
204
Last checked
Reachability
100% over 14 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": {
      "properties": {
        "isbn": {
          "description": "An ISBN-10 or ISBN-13, with or without hyphens.",
          "type": "string"
        }
      },
      "required": [
        "isbn"
      ],
      "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

{
  "properties": {
    "example": {
      "properties": {
        "read": {
          "enum": [
            "neither",
            "true",
            "false",
            "both"
          ]
        },
        "record": {
          "description": "The normalized CSL-JSON book record when found.",
          "type": "object"
        },
        "refusal": {
          "description": "The invalid-checksum or not-found refusal when no record can be returned.",
          "type": "object"
        },
        "sources": {
          "items": {
            "type": "string"
          },
          "type": "array"
        }
      },
      "required": [
        "sources",
        "read"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}