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-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 challenges on the Base network, settled in USDC.
The specific endpoint `/api/v1/stripe/subscriptions/145` is listed as "Premium API Access" and returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's uniform $0.02/request pricing. Payment is made via the x402 "exact" scheme to the specified payTo address, with a 300-second timeout.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /api, /README) all resolve to minimal "Connect wallet" stubs, providing no further detail on request/response schemas, authentication flows, or what data this particular "Premium API Access" endpoint actually returns. The endpoint name suggests it may relate to Stripe subscription management, but there is no documentation to confirm what inputs it expects or what outputs it produces.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without traditional API key registration
- —Agent-driven workflows that need to pay per request using on-chain USDC on Base
- —Accessing subscription-related data or functionality via a single micropayment
Fit
Best for
- —Developers or agents wanting keyless, pay-as-you-go API access
- —x402-compatible agents that can settle USDC payments on Base
- —Low-commitment API consumption at $0.02 per call
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/145
# 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/145",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}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 on what the endpoint actually does, no request/response schema, and all doc pages are empty stubs. The endpoint name ('stripe/subscriptions/145') is opaque without further context.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; it is unclear what this endpoint returns after successful payment.
- —The endpoint path suggests Stripe subscription functionality but no details confirm this.
- —No examples of authenticated (paid) responses are available.
Citations
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base.https://lowpaymentfee.com/api/v1/stripe/subscriptions/145
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/stripe/subscriptions/145