x402-gated premium API access on Base, paid per-request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all payable per-request via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/stripe/subscriptions/171` returns a valid x402 challenge (version 1, scheme "exact") requesting up to 20,000 base units of USDC (0x8335…) on Base. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's advertised flat pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and is marked as discoverable.
However, the actual functionality behind this specific endpoint is unclear. The URL path suggests a Stripe subscription resource (ID 171), but the platform's landing page does not list or describe this particular route. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, API, pricing, and README pages all rendered only a "Connect wallet" prompt with no substantive content. Without knowing what data or service this endpoint returns upon successful payment, agents should treat this as a low-documentation listing.
Capabilities
Use cases
- —Programmatic access to a premium API resource via x402 micropayment
- —Agent-driven per-request purchasing without API keys or subscriptions
- —Demonstrating x402 payment flow on Base with USDC
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that can handle x402 challenges and USDC payments
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before paying
- —Applications requiring known, well-documented response schemas
- —High-volume use cases where $0.02/request adds up without clear value
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/171 \
-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, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint (stripe/subscriptions/171) is unexplained. The docs and other pages are empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —The endpoint path '/api/v1/stripe/subscriptions/171' is not listed among the platform's advertised APIs; its actual functionality is unknown.
- —No request body schema or response schema provided; callers cannot know what to send or what to expect back.
- —No OpenAPI spec or ai-plugin manifest found.
Citations
- —The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02.https://lowpaymentfee.com/api/v1/stripe/subscriptions/171
- —The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com