x402-gated premium API endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories. The specific resource `/api/v1/stripe/charges/141` is labeled "Premium API Access" and is gated behind the x402 payment protocol on the Base network. Payment is settled in USDC (USD Coin) at the contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.
The x402 challenge indicates a maximum amount of 20,000 base units of USDC. 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. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised — access is purely payment-gated.
However, the specific functionality behind this particular endpoint path (`/stripe/charges/141`) is unclear. The name "Premium API Access" is generic and does not describe what data or service is returned. The platform's documentation pages (docs, api, pricing, README) all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available. The endpoint is confirmed live (402 challenge captured), but what it actually does beyond accepting payment and returning JSON is not documented in any crawled material.
Capabilities
Use cases
- —Programmatic access to a payment-gated JSON API without API keys
- —Agent-driven per-call purchasing of premium data or services
- —Demonstrating x402 payment protocol integration on Base
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-use API access on Base
- —Low-cost per-request API consumption settled in USDC
Not for
- —Users who need detailed documentation or OpenAPI specs before integrating
- —High-volume use cases where $0.02/request adds up significantly
- —Anyone needing clarity on what the endpoint actually returns before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/141 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint is completely undocumented. The docs, API, pricing, and README pages all returned only 'Connect wallet' with no content.
Warnings
- —The specific functionality of /api/v1/stripe/charges/141 is undocumented — 'Premium API Access' is a generic label with no description of inputs or outputs.
- —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content.
- —No OpenAPI schema, request body schema, or response examples are available.
- —The endpoint path includes 'stripe/charges' which may relate to Stripe payment processing, but this is speculative — no documentation confirms it.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/141
- —Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/charges/141