Historical stock data for CME via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint provides historical stock data for CME (CME Group) through a pay-per-request x402 protocol. It is hosted on lowpaymentfee.com, a platform offering a broad catalog of x402-enabled APIs spanning data analytics, AI/ML, finance, crypto, and utility services. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/stocks/CME/history` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum payment of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the historical stock data includes or what query parameters are accepted. The endpoint's behavior must be inferred entirely from its URL path and the x402 challenge metadata.
Capabilities
Use cases
- —Retrieving historical stock price data for CME Group
- —Backtesting trading strategies using CME historical data
- —Building financial dashboards that pull CME stock history on demand
- —Agent-driven portfolio analysis requiring per-call payment
Fit
Best for
- —Agents or apps needing on-demand CME stock history without subscription commitments
- —Developers who want keyless, pay-per-use financial data APIs
- —x402-compatible clients settling micropayments in USDC on Base
Not for
- —Users needing comprehensive documentation or well-defined request/response schemas before integrating
- —High-frequency trading requiring bulk historical data downloads at low marginal cost
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/CME/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The actual data format and accepted parameters are entirely unknown.
Warnings
- —No documentation available — docs, API, pricing, and README pages all return only a wallet connect prompt
- —No OpenAPI or request/response schema provided; request body and response format are unknown
- —Endpoint purpose inferred solely from URL path; actual data coverage and fields are unverified
- —Platform appears to be a generic x402 API storefront; quality and reliability of underlying data sources are unclear
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stocks/CME/history
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stocks/CME/history
- —Docs, API, pricing, and README pages returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs