Historical stock price data for REGN (Regeneron) via x402 micropayment on Base.
What it does
This endpoint provides historical stock price data for Regeneron Pharmaceuticals (ticker: REGN) through the x402 payment protocol. It is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each request is independently paid.
Documentation on the site is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The exact request body format and response structure for the stock history endpoint are unknown and must be inferred or discovered experimentally.
Capabilities
Use cases
- —Retrieving historical price data for Regeneron (REGN) stock for backtesting or analysis
- —Building trading dashboards that pull stock history on demand with per-request payment
- —Agents autonomously purchasing financial data without pre-registered API keys
Fit
Best for
- —Developers needing on-demand stock history without subscription overhead
- —AI agents that can settle x402 payments autonomously on Base
- —Low-volume or sporadic access to REGN historical price data
Not for
- —High-frequency trading requiring sub-second latency and bulk data feeds
- —Users who need comprehensive multi-ticker coverage from a single documented API
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/REGN/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>"Endpoint
Quality
The endpoint is live (returns a valid x402 402 challenge) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual data returned is entirely unknown.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content
- —No OpenAPI or schema definition; request body format and response structure are completely undocumented
- —The specific stock history endpoint for REGN is not listed on the landing page among the advertised APIs, raising questions about its provenance
- —Cannot verify data source, freshness, or accuracy of historical stock data returned
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stocks/REGN/history
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/stocks/REGN/history
- —Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs