Stock data endpoint for USB, pay-per-request via x402 on Base with USDC.
What it does
This endpoint at lowpaymentfee.com provides stock data for the ticker "USB" (U.S. Bancorp) via a pay-per-call x402 protocol. 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 or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider, lowpaymentfee.com, hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/crypto, and utility services — all priced uniformly at $0.02 per request. This specific endpoint (/api/v1/stocks/USB) falls under the finance category. Documentation is extremely sparse: the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no example request/response, and no description of the response payload beyond the generic "Premium API Access" label.
Because of the lack of documentation, callers should expect to experiment with the POST body to discover accepted parameters and the shape of the returned stock data. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data quality, freshness, and coverage are unknown.
Capabilities
Use cases
- —Fetching current or recent stock data for U.S. Bancorp (USB)
- —Integrating pay-per-call stock lookups into autonomous agent workflows
- —Accessing financial data without API key registration
Fit
Best for
- —Agents needing on-demand stock data with crypto micropayments
- —Developers prototyping x402-based finance integrations
- —Users who want keyless, no-commitment stock data access
Not for
- —Bulk historical stock data downloads (no evidence of batch support)
- —Users who need comprehensive multi-ticker coverage from a single endpoint
- —Anyone requiring detailed API documentation or SLAs before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stocks/USB \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are empty. The actual data returned is entirely unknown, making this effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and API pages only show 'Connect wallet'
- —No OpenAPI or output schema provided; response format is unknown
- —Unclear what stock data fields are returned or how fresh the data is
- —The ticker 'USB' is inferred to mean U.S. Bancorp but is not confirmed by the provider
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base networkhttps://lowpaymentfee.com/api/v1/stocks/USB
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stocks/USB