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 located at `/api/v1/stripe/subscriptions/149` and returns a valid 402 challenge when called without payment, confirming it is live. The challenge specifies payment in USDC on the Base network, with a maximum amount of 20,000 base units (0.02 USDC, i.e. $0.02 per request). The payment scheme is "exact" and settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.
The broader lowpaymentfee.com platform advertises a range of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, the specific endpoint `/api/v1/stripe/subscriptions/149` is labeled "Premium API Access" and its exact functionality is not documented beyond that label. The URL path suggests it may relate to Stripe subscription management, but no schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Because the endpoint's actual behavior behind the paywall is undocumented, agents should treat this as a stub listing. The x402 challenge is well-formed and the endpoint is confirmed live, but what it returns after payment is unknown.
Capabilities
Use cases
- —Paying per-call for premium API access using USDC on Base
- —Integrating x402-gated endpoints into agent workflows
- —Accessing a subscription-related resource without traditional API keys
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Developers exploring x402 pay-per-call patterns
- —Use cases requiring keyless, instant API access
Not for
- —Users who need detailed API documentation before purchasing
- —Applications requiring known, well-documented response schemas
- —Non-crypto payment workflows
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/149 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02. However, there is no documentation of what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub.
Warnings
- —Endpoint functionality behind the paywall is completely undocumented
- —No request or response schema available
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content
- —The URL path '/api/v1/stripe/subscriptions/149' suggests Stripe subscription management but this is unconfirmed
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/149
- —The platform advertises $0.02 per request pricing 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/149