Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/charges/147` is listed under the x402 challenge with a maxAmountRequired of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. It accepts POST requests and returns application/json. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.
Documentation is extremely sparse. The site's /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no description of what this particular endpoint actually returns beyond the generic label "Premium API Access." The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides.
Capabilities
Use cases
- —Accessing premium API functionality without traditional API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven programmatic access to paid endpoints via x402 protocol
Fit
Best for
- —Developers who want keyless, pay-per-use API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where subscription pricing would be cheaper
Quick start
# Send a POST with x402 payment header to access the endpoint
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/147 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <your-x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what it actually does or returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The listing label 'Premium API Access' is generic and uninformative.
Warnings
- —No documentation available — /docs, /pricing, /api, /README all show only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —The specific functionality of /api/v1/stripe/charges/147 is completely undocumented
- —Cannot verify what data or service this endpoint actually provides
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/stripe/charges/147
- —Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/147