Clinical Trials

{
  "attribution": "ClinicalTrials.gov (US National Library of Medicine)",
  "checkedAt": "2026-10-14T07:00:32.309Z",
  "disclaimer": "Information only, not medical advice.",
  "query": {
    "phase": null,
    "q": "insulin",
    "status": "RECRUITING"
  },
  "source": "https://clinicaltrials.gov/api/v2/studies",
  "studies": [
    {
      "completion": "2029-08-30",
      "conditions": [
        "Obesity"
      ],
      "enrollment": 232,
      "link": "https://clinicaltrials.gov/study/NCT06885736",
      "locations": 1,
      "nctId": "NCT06885736",
      "phases": [
        "NA"
      ],
      "sponsor": "Dasman Diabetes Institute",
      "start": "2025-08-07",
      "status": "RECRUITING",
      "title": "LEAN Mass Preservation With Resistance Exercise and Protein During Semaglutide/Tirzepatide Therapy"
    },
    {
      "completion": "2027-02",
      "conditions": [
        "IPEX"
      ],
      "enrollment": 30,
      "link": "https://clinicaltrials.gov/study/NCT05241444",
      "locations": 1,
      "nctId": "NCT05241444",
      "phases": [
        "PHASE1"
      ],
      "sponsor": "Bacchetta, Rosa, MD",
      "start": "2022-03-22",
      "status": "RECRUITING",
      "title": "CD4^LVFOXP3 in Participants With IPEX"
    }
  ]
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.sitecheck-api.workers.dev/api/clinical-trials?limit=2&q=insulin&status=RECRUITING'

# 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://api.sitecheck-api.workers.dev/api/clinical-trials?limit=2&q=insulin&status=RECRUITING' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fclinical-trials
const res = await pay("https://api.sitecheck-api.workers.dev/api/clinical-trials?limit=2&q=insulin&status=RECRUITING");
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.sitecheck-api.workers.dev/api/clinical-trials?limit=2&q=insulin&status=RECRUITING")
    print(res.status_code, res.text)