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 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 instant access, settled on the Base network using USDC.
The specific endpoint `/api/v1/stripe/subscriptions/20` returns a valid x402 challenge with a maximum amount of 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 advertised pricing of $0.02/request across all endpoints. Payment is made via the x402 "exact" scheme to the specified payTo address.
However, the actual functionality behind this specific endpoint path (`/stripe/subscriptions/20`) is unclear. The path suggests it may relate to Stripe subscription management, but no documentation, request schema, or response schema is available beyond the x402 challenge metadata. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without further documentation, the exact input parameters and response format remain unknown.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to platform services
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation before integrating
- —Applications requiring free or fiat-only payment methods
- —High-volume use cases where per-request pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/20
# 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/20",
"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 per request). However, there is no documentation, no request/response schema, and the actual functionality behind this specific path is entirely unclear. The crawled pages beyond the landing page were empty (just 'Connect wallet'). This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all returned only 'Connect wallet' with no content.
- —The endpoint path '/api/v1/stripe/subscriptions/20' suggests Stripe subscription functionality but no details are provided about what it actually does.
- —No request or response schema available; input parameters and output format are unknown.
- —This endpoint is not listed among the advertised APIs on the landing page, raising questions about its intended use.
Citations
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/20
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/20