x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 challenges on the Base network and settled in USDC.
The specific endpoint `/api/v1/stripe/subscriptions/69` is listed as "Premium API Access" and returns a valid x402 challenge (HTTP 402) requesting up to $0.02 USDC (20,000 base units with 6 decimals) per call on Base. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and returns `application/json`.
The platform advertises a uniform $0.02 per request pricing model with no API keys, no rate limits, no minimums, and instant access. However, documentation pages beyond the landing page are essentially empty (showing only "Connect wallet"), so the actual request/response schemas, authentication details, and what data this specific "Premium API Access" endpoint returns are unknown. The endpoint path suggests it may relate to Stripe subscription management, but no further details are available from the crawled content.
Capabilities
Use cases
- —Accessing premium API functionality with per-call USDC micropayments
- —Agent-driven API consumption without API keys or subscriptions
- —Programmatic access to services gated by x402 payment challenges
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over traditional subscriptions
Not for
- —Users who need detailed API documentation before integrating
- —Applications requiring free or fiat-only payment methods
- —High-volume use cases where per-call pricing may not be economical
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/69 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, documentation pages are empty, there is no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint is unclear from the available material. The endpoint path ('stripe/subscriptions/69') is unexplained.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render as empty 'Connect wallet' pages with no usable content.
- —The actual request body schema and response format for this endpoint are completely unknown.
- —The endpoint path references 'stripe/subscriptions' but no explanation of what this returns or does is available.
- —No OpenAPI or machine-readable schema is provided.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/69
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/69
- —Documentation pages render only 'Connect wallet' with no usable contenthttps://lowpaymentfee.com/docs