Official Clinicaltrials Search

{
  "observed_at": "2026-09-06T00:00:00Z",
  "result": {
    "freshness": {
      "cacheAgeSeconds": 0,
      "maximumCacheSeconds": 0,
      "recordAgeIsNotRetrievalAge": true,
      "retrievedAt": "2026-09-06T00:00:00Z",
      "state": "CURRENT_RETRIEVAL"
    },
    "normalizedResult": [
      {
        "completionDate": null,
        "lastUpdatePostDate": null,
        "nctId": "NCT00110383",
        "overallStatus": null,
        "phases": [],
        "sourceUrl": "https://clinicaltrials.gov/study/NCT00110383",
        "startDate": null,
        "studyType": null,
        "title": null
      }
    ],
    "observedAt": "2026-09-06T00:00:00Z",
    "provenance": {
      "attribution": "ClinicalTrials.gov, US National Library of Medicine",
      "documentationUrl": "https://clinicaltrials.gov/data-api/api",
      "license": "ClinicalTrials.gov terms; bounded factual study metadata only",
      "limitations": [
        "Synthetic example only; identifiers and null values illustrate fields, not a live observation."
      ],
      "modifications": "Selected factual fields, normalized names and bounded result count; no source ownership claimed.",
      "termsUrl": "https://clinicaltrials.gov/about-site/terms-conditions",
      "truncated": false,
      "upstreamCalls": 1
    },
    "query": {
      "condition": "asthma",
      "limit": 5
    },
    "rawSourceIdentifiers": [],
    "source": "ClinicalTrials.gov",
    "sourceProcessedAt": null,
    "sourceUpdatedAt": null,
    "sourceUrl": "https://clinicaltrials.gov"
  },
  "route": "clinicaltrials-search"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev/v2/official/clinicaltrials-search' \
  -H 'content-type: application/json' \
  --data-raw '{"condition":"asthma","limit":5}'

# 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 - -X POST 'https://foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev/v2/official/clinicaltrials-search' \
  -H 'content-type: application/json' \
  --data-raw '{"condition":"asthma","limit":5}' \
  | 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%2Ffoundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev%2Fv2%2Fofficial%2Fclinicaltrials-search&method=POST
const res = await pay("https://foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev/v2/official/clinicaltrials-search", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "condition": "asthma",
    "limit": 5
  }),
});
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.post(
        "https://foundry-par007-machine-revenue-mainnet.inference-chip-index.workers.dev/v2/official/clinicaltrials-search",
        json={
            "condition": "asthma",
            "limit": 5,
        },
    )
    print(res.status_code, res.text)