Historical crude oil (CL) stock/commodity data via x402 micropayment on Base for $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides historical price data for the CL (crude oil futures) ticker via a pay-per-request x402 model. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — each call is individually paid via the x402 protocol's X-PAYMENT header.
The provider, lowpaymentfee.com, hosts a broader suite of APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per request. Documentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. As a result, the exact request body schema, available query parameters (e.g., date ranges, intervals), and response format for the /stocks/CL/history endpoint are unknown and must be discovered experimentally.
The endpoint is confirmed live: the probe received a proper HTTP 402 x402 challenge with version 1, scheme "exact", and a 300-second payment timeout. The asset is USD Coin (version 2) on Base mainnet.
Capabilities
Use cases
- —Fetching historical crude oil (CL) futures price data for backtesting trading strategies
- —Integrating commodity price history into financial dashboards or analytics pipelines
- —Agent-driven on-demand retrieval of oil market data without subscription overhead
- —Building datasets for energy market research or forecasting models
Fit
Best for
- —Developers needing low-friction, pay-per-call access to commodity history
- —AI agents that need to autonomously purchase financial data on-chain
- —Projects that want to avoid API key management and subscription commitments
Not for
- —High-frequency trading requiring sub-second latency and bulk data (no documented batch endpoint)
- —Users who need comprehensive documentation or guaranteed SLAs before integrating
- —Free-tier seekers — every request costs $0.02 in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/CL/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Example
Request
{
"range": "1m",
"symbol": "CL"
}Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation for request parameters, response schema, or data coverage. The /docs, /pricing, and /README pages are empty stubs. The example request JSON is entirely inferred.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no technical content.
- —Request body schema and response format are unknown; the example_request_json is speculative.
- —Data source, coverage period, and update frequency for CL historical data are undocumented.
- —No OpenAPI spec or AI plugin manifest found.
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge, scheme exact, on Base network using USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stocks/CL/history
- —maxAmountRequired is 20000 base units (USDC, 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/stocks/CL/history
- —Provider advertises $0.02/request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —Provider lists finance, AI/ML, data analytics, and utility API categories all at $0.02/requesthttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) contain only a Connect wallet prompthttps://lowpaymentfee.com/docs