Open Library book metadata search. Lookup by free-text query (matches title + author), or by individual title / author / ISBN (10 or 13 digit). Each record includes Open Library work key, title, author names + Open Library author keys, first publish year, edition count, cover image URL, sample ISBNs, publishers, languages, subject tags, fulltext flag, ebook access tier (public/borrowable/printdisabled/no_ebook), and canonical openlibrary.org URL. CC0 public-domain metadata.
/api/book/searchPAYMENT-SIGNATURE.The search API is a pay-per-call book endpoint built for AI agents and autonomous software. Open Library book metadata search.
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in search data source for an agent tool-use loop, an MCP host, or a backend that needs book data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
q | string | min 2 chars · max 200 chars |
title | string | min 2 chars · max 200 chars |
author | string | min 2 chars · max 200 chars |
isbn | string | min 9 chars · max 17 chars |
limit | integer | min 1 · max 50 |
page | integer | min 1 · max 100 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/book/search?q=xx&title=xx&author=xx&isbn=xxxxxxxxx&limit=10&page=1' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/book/search?q=xx&title=xx&author=xx&isbn=xxxxxxxxx&limit=10&page=1' \ -H 'PAYMENT-SIGNATURE: <base64-json-payload>' # Or use the canonical runner (handles probe → sign → retry): # EVM_PRIVATE_KEY=0x... node --env-file=.env.local \ # --experimental-strip-types scripts/x402-pay.ts \ # 'https://2s.io/api/book/search?q=xx&title=xx&author=xx&isbn=xxxxxxxxx&limit=10&page=1'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.book.search({
"q": "xx",
"title": "xx",
"author": "xx",
"isbn": "xxxxxxxxx",
"limit": 10,
"page": 1
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.book.search(q="xx", title="xx", author="xx", isbn="xxxxxxxxx", limit=10, page=1)
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
// EVM_PRIVATE_KEY funds x402 payments per call.
// claude_desktop_config.json
{
"mcpServers": {
"2sio": {
"command": "npx",
"args": ["-y", "@2sio/mcp"],
"env": { "EVM_PRIVATE_KEY": "0x..." }
}
}
}
// 2. Once the server is running, agents call this tool via standard MCP:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "book.search",
"arguments": {
"q": "xx",
"title": "xx",
"author": "xx",
"isbn": "xxxxxxxxx",
"limit": 10,
"page": 1
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object | |
page | object | |
meta | object |
{
"ok": true,
"items": [
{
"workKey": "example",
"title": "example",
"authorNames": [
"example"
],
"authorKeys": [
"example"
],
"firstPublishYear": 1,
"editionCount": 1,
"coverEditionKey": "example",
"coverImageUrl": "example",
"isbns": [
"example"
],
"publishers": [
"example"
],
"languages": [
"example"
],
"subjectTags": [
"example"
],
"hasFulltext": false,
"ebookAccess": "example",
"openlibraryUrl": "https://example.com"
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
},
"page": {
"number": 1,
"size": 1,
"pages": 1
},
"meta": {
"query": {
"q": "example",
"title": "example",
"author": "example",
"isbn": "example",
"limit": 1,
"page": 1
}
}
}