Tools · search

Academic paper search (OpenAlex, ~250M works)

Find academic papers in any field - title, authors, year, venue, DOI, citation count, open-access link and abstract - from OpenAlex (~250M works incl. arXiv and PubMed; Crossref answers if OpenAlex is down). Filter by year range and open access; sort by relevance, citations or date. Send {} to search the published example query. A search with no result is not charged. Pay-per-call via x402.

$0.009 per call, paid in USDC on Base or Solana with x402 — no account, no API key. POST https://fiatdock.com/v1/papers/search (or GET with the same fields as query parameters) · MCP tool paper_search. An answer the tool cannot produce is refused with 4xx/5xx and is not charged.

Inputs

Field	Type	Description	Example
`query`	string	What to search for (title and abstract; full text too when sorting by relevance) — an empty body searches the published example	`"large language model agents"`
`fromYear`	integer	Earliest publication year	`2023`
`toYear`	integer	Latest publication year	`2026`
`openAccessOnly`	boolean	Only papers with a free full-text copy (default false)	`false`
`sort`	one of relevance, cited, recent	Order: relevance (default with a query), cited (most cited first, default without one) or recent	`"relevance"`
`limit`	integer	How many papers, 1-25, default 10	`10`

Example

Request body

{"query":"large language model agents","limit":5}

Answer (the published example)

{"query":"large language model agents","filters":{"fromYear":null,"toYear":null,"openAccessOnly":false,"sort":"relevance"},"totalMatched":1158374,"count":1,"papers":[{"title":"A survey on large language model based autonomous agents","authors":["Lei Wang","Chen Ma","Xueyang Feng"],"authorCount":11,"year":2024,"publicationDate":"2024-03-22","venue":"Frontiers of Computer Science","type":"article","doi":"10.1007/s11704-024-40231-1","url":"https://doi.org/10.1007/s11704-024-40231-1","openAccess":true,"openAccessUrl":"https://link.springer.com/article/10.1007/s11704-024-40231-1","citedBy":1688,"abstract":"Autonomous agents have long been a research focus in academic and industry communities…"}],"source":"OpenAlex (api.openalex.org, CC0 metadata)","asOf":"2026-10-05T00:00:00.000Z","note":"Titles, author names and abstracts are the authors' and publishers' text."}

Call it

curl

# 1) ask: an unpaid call answers 402 with the exact price (free)
curl -i -X POST https://fiatdock.com/v1/papers/search -H 'content-type: application/json' -d '{"query":"large language model agents","limit":5}'
# 2) pay: any x402 client signs that 402 and resends — see Node or Python below

Node

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:*", client: new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_PRIVATE_KEY)) }],
});
const r = await pay("https://fiatdock.com/v1/papers/search", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"query":"large language model agents","limit":5}),
});
console.log(r.status, await r.json());

Python

# pip install "x402[httpx,evm]"
import asyncio, json, os
from eth_account import Account
from x402 import x402Client
from x402.http.clients import x402HttpxClient
from x402.mechanisms.evm.exact import register_exact_evm_client

async def main():
    client = register_exact_evm_client(x402Client(), Account.from_key(os.environ["AGENT_PRIVATE_KEY"]))
    async with x402HttpxClient(client) as http:
        r = await http.post("https://fiatdock.com/v1/papers/search", json=json.loads("{\"query\":\"large language model agents\",\"limit\":5}"))
        print(r.status_code, r.json())

asyncio.run(main())

MCP (Claude, Cursor, any MCP client)

{"mcpServers":{"fiatdock":{"command":"npx","args":["-y","fiatdock-mcp"],"env":{"AGENT_PRIVATE_KEY":"0x<your agent wallet key>"}}}}
// then call the tool "paper_search" — the package pays each call from that wallet

The wallet needs USDC on Base. Prefer no install? The remote server https://fiatdock.com/mcp answers the 402 as tool output for an agent that signs its own payments.

Related tools

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Machine-readable: OpenAPI · tools.json · llms.txt · /.well-known/x402