Papers Pubmed

{
  "count": 1,
  "papers": [
    {
      "abstract": "BACKGROUND: ...",
      "authors": [
        "Smith J"
      ],
      "doi": "10.1016/...",
      "journal": "The Lancet",
      "mesh_terms": [
        "Obesity"
      ],
      "pmid": "40466247",
      "publication_types": [
        "Review"
      ],
      "title": "...",
      "url": "https://pubmed.ncbi.nlm.nih.gov/40466247/",
      "year": 2025
    }
  ],
  "query": "glp-1 obesity",
  "source": "PubMed",
  "total_matches": 11664
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/papers/pubmed?q=glp-1+obesity'

# 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://saylorinnovations.com/api/papers/pubmed?q=glp-1+obesity' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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%2Fsaylorinnovations.com%2Fapi%2Fpapers%2Fpubmed
const res = await pay("https://saylorinnovations.com/api/papers/pubmed?q=glp-1+obesity");
console.log(res.status, await res.text());

# 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://saylorinnovations.com/api/papers/pubmed?q=glp-1+obesity")
    print(res.status_code, res.text)