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by Academic Paper Search in Search & web

x402 APIPassing, checked 5 h ago

Scientific and academic paper search: research papers and scholarly literature from arXiv, PubMed, OpenAlex, Crossref and Semantic Scholar in one call, deduplicated and retraction-aware. Each hit: DOI, authors, venue, snippet, citation count and citations per year, type, open-access PDF link. Sort by relevance, recency, citations or impact. Keyless. For literature review and citing research.

GET
https://papers.use.x402atlas.com/search
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
498 ms
567 ms slowest 5%
Last check
Passed
5 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://papers.use.x402atlas.com/search

Each call costs $0.01 in USDC on Polygon, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://papers.use.x402atlas.com/search?limit=10&open_access=false&query=transformer+attention+mechanism&sort=impact&source=all&year_from=2017&year_to=2026

Parameters

ParameterTypeRequiredDescription
limitintegerNo Default: 20.
open_accessbooleanNotrue keeps only items with a pdfUrl Default: false.
querystringYesFree-text search
sortstringNoimpact = citations per year One of: relevance, recency, citations, impact. Default: "relevance".
sourcestringNo One of: all, arxiv, pubmed, openalex, crossref, semanticscholar. Default: "all".
year_fromintegerNo
year_tointegerNo

Example response

The provider's example. We can't check it without paying.

Example response, 32 lines
{
  "count": 1,
  "coverage": {
    "complete": true,
    "missing": [],
    "retry": false
  },
  "items": [
    {
      "authors": [
        "Ashish Vaswani",
        "Noam Shazeer",
        "Niki Parmar"
      ],
      "citationCount": 181057,
      "citationsPerYear": 18105.7,
      "detail_url": "https://papers.use.x402atlas.com/paper?id=10.48550/arxiv.1706.03762",
      "doi": "10.48550/arxiv.1706.03762",
      "id": "10.48550/arxiv.1706.03762",
      "is_retracted": false,
      "oa_status": "green",
      "pdfUrl": "https://arxiv.org/pdf/1706.03762",
      "snippet": "The dominant sequence transduction models are based on complex recurrent or convolutional neural networks that include an encoder and a decoder. The best performing models also connect the encoder and decoder through an attention mechanism…",
      "title": "Attention Is All You Need",
      "type": "preprint",
      "url": "https://doi.org/10.48550/arxiv.1706.03762",
      "venue": "Advances in Neural Information Processing Systems",
      "year": 2017
    }
  ],
  "query": "transformer attention mechanism year:2017-2026 sort:impact"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://papers.use.x402atlas.com/search?limit=10&open_access=false&query=transformer+attention+mechanism&sort=impact&source=all&year_from=2017&year_to=2026'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://papers.use.x402atlas.com/search?limit=10&open_access=false&query=transformer+attention+mechanism&sort=impact&source=all&year_from=2017&year_to=2026' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fpapers.use.x402atlas.com%2Fsearch
const res = await pay("https://papers.use.x402atlas.com/search?limit=10&open_access=false&query=transformer+attention+mechanism&sort=impact&source=all&year_from=2017&year_to=2026");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://papers.use.x402atlas.com/search?limit=10&open_access=false&query=transformer+attention+mechanism&sort=impact&source=all&year_from=2017&year_to=2026")
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
5 h agoPassed402498 ms$0.01
10 h agoPassed402567 ms$0.01