x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/charges/159` returned a live 402 challenge with an x402 v1 "exact" payment scheme. The challenge specifies a max amount of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.
However, the actual functionality behind this specific endpoint path (`/stripe/charges/159`) is unclear. The site's landing page lists many API categories but does not specifically document this path. No OpenAPI spec, request/response schemas, or detailed documentation were found — the docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt with no substantive content. Without knowing what this endpoint actually returns upon successful payment, consumers should treat this as an exploratory or demonstration endpoint until more documentation surfaces.
Capabilities
Use cases
- —Programmatic pay-per-call API access without API keys or subscriptions
- —Agent-driven workflows that need on-demand endpoint access settled in USDC on Base
- —Exploring x402 payment protocol integration patterns
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring keyless, commitment-free API access
Not for
- —Production workloads requiring well-documented request/response contracts
- —Users who need fiat-only payment options
- —High-throughput batch processing where per-call crypto settlement adds latency
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/159 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what the endpoint actually does beyond the generic label "Premium API Access". The docs pages are empty. This is effectively a stub listing.
Warnings
- —No OpenAPI spec or request/response schema available
- —Documentation pages (docs, pricing, API, README) all render only a 'Connect wallet' prompt with no content
- —The specific endpoint path /api/v1/stripe/charges/159 is not listed on the site's landing page catalog
- —Actual functionality behind this endpoint is unknown — treat as exploratory
Citations
- —The endpoint returns a live 402 challenge with x402 v1 exact scheme, maxAmountRequired 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/159
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/charges/159