x402-gated premium API endpoint on Base, payable in USDC at $0.02 per request.
What it does
This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. The specific endpoint at `/api/v1/stripe/charges/148` is labeled "Premium API Access" but its exact functionality is not documented beyond that title. The platform advertises uniform $0.02-per-request pricing across all endpoints.
Payment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The probe confirms the endpoint is live, returning a 402 challenge with `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is "exact" with a 300-second timeout. No API keys or rate limits are advertised — access is purely pay-per-call.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns or what input it expects. The `outputSchema` in the x402 challenge indicates it accepts HTTP POST but provides no further detail on the request body or response format.
Capabilities
Use cases
- —Accessing a pay-per-request API without needing API keys or subscriptions
- —Demonstrating x402 protocol payment flows on Base network
- —Programmatic micro-payment API consumption using USDC
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access
- —Low-volume consumers who want no-commitment API usage
Not for
- —Users who need well-documented API contracts with clear request/response schemas
- —High-volume production workloads requiring SLAs or support
- —Anyone needing to understand exactly what this specific endpoint returns before paying
Quick start
# The endpoint requires an x402 payment header (USDC on Base).
# Using curl to see the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/148
# Returns 402 with x402 challenge JSON.
# To complete payment, attach an X-PAYMENT header with a valid x402 payment proof.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is essentially no documentation: no OpenAPI schema, no request/response examples, no description of what the endpoint actually does. The docs pages are empty beyond a wallet-connect prompt. The endpoint name 'stripe/charges/148' is opaque and unexplained.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —The endpoint path '/api/v1/stripe/charges/148' suggests Stripe-related functionality but this is unconfirmed and undocumented.
- —No request body schema or response schema is provided; callers cannot know what to send or what to expect back.
- —The platform lists many endpoints but none appear to have individual documentation.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/148
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/148
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs