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 & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/charges/386` is listed as "Premium API Access" and accepts POST requests. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals) to the payee address `0x1A2B...85F3` on Base. No API keys, rate limits, or upfront commitments are required — access is instant once payment is included.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns. The site's landing page groups its APIs into categories (analytics, AI, finance, infrastructure) but does not clarify which category `/api/v1/charges/386` belongs to or what data it provides. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.
Capabilities
Use cases
- —Accessing premium data or services with per-request USDC micropayments on Base
- —Agent-driven API consumption without API keys or subscriptions
- —Programmatic pay-as-you-go access to undisclosed premium content
Fit
Best for
- —Developers or agents wanting keyless, pay-per-call API access
- —Users who prefer crypto micropayments over subscription billing
- —x402-compatible agent workflows on the Base network
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Anyone requiring free or trial access to evaluate the endpoint's output
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/386 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or output schema describing what this endpoint returns.
- —The specific functionality of /api/v1/charges/386 ('Premium API Access') is completely undescribed; it is unclear what data or service it provides.
- —No request body schema or example responses are available.
Citations
- —The endpoint returns a 402 challenge requiring USDC payment of up to 20,000 base units ($0.02) on Base network.https://lowpaymentfee.com/api/v1/charges/386
- —The site advertises all APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/charges/386
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no further content.https://lowpaymentfee.com/docs