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, settling payments in USDC on the Base network. The specific resource path (`/api/v1/stripe/subscriptions/125`) suggests a subscription-related or premium-tier endpoint, though the exact data or functionality it returns is not documented beyond its title.
The provider operates a broader platform offering multiple x402-gated API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request. However, this particular endpoint advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02, consistent with the site-wide pricing. Payment is made via the x402 exact scheme to a specified wallet address, with a 300-second timeout.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no description of what data or service this endpoint actually returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what payload to send or what response to expect.
Capabilities
Use cases
- —Accessing a premium API resource with per-call USDC micropayments
- —Agent-driven API consumption without API keys or subscriptions
- —Programmatic access to subscription-related data via x402 protocol
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can handle x402 USDC payments on Base
- —Use cases requiring keyless, pay-per-call API access
Not for
- —Users who need detailed API documentation before integrating
- —Production workloads requiring guaranteed SLAs or support
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/125 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what the endpoint actually does beyond its title 'Premium API Access'. The purpose of the specific path (/stripe/subscriptions/125) is unclear.
Warnings
- —No documentation available — all doc/pricing/API pages render only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The endpoint path references 'stripe/subscriptions' but the actual functionality is undocumented
- —No examples of expected request body or response format
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/125
- —The site advertises $0.02 per request pricing across all APIs with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/125