x402-gated premium API access on Base, paid per-request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are pay-per-request with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/stripe/subscriptions/105` is labeled "Premium API Access" and returns a valid x402 challenge on POST. The challenge specifies payment in USDC (USD Coin) on the Base network, with a maximum amount of 20,000 base units — which at 6 decimals equals $0.02 per request. Payment is made via the x402 "exact" scheme to the specified wallet address. The endpoint accepts POST requests and returns application/json responses.
Documentation on the platform is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what "Premium API Access" actually returns or what input parameters it expects. The endpoint's purpose beyond its name is unclear — it could relate to Stripe subscription management given the URL path, but this is speculative.
Capabilities
Use cases
- —Accessing a premium API endpoint without traditional API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven API consumption with per-call micropayments
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation before integrating
- —Anyone requiring non-crypto (fiat-only) payment methods
- —High-volume use cases where subscription pricing would be cheaper
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/105
# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof to access.Example
Response
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://lowpaymentfee.com/api/v1/stripe/subscriptions/105",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond its name. The platform's docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response format.
- —The actual functionality of 'Premium API Access' at the /stripe/subscriptions/105 path is unknown — the name suggests Stripe subscription management but this is unconfirmed.
- —No examples of successful (200) responses are available.
Citations
- —The endpoint returns a valid x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/stripe/subscriptions/105
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs