x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The price per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request. Payment is made via the x402 "exact" scheme to a specified wallet address, with a 300-second timeout window.
The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access via Base network USDC payments.
However, the specific endpoint being listed here — `/api/v1/stripe/subscriptions/44` — is labeled "Premium API Access" without further documentation on what data or functionality it returns. The crawled docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without traditional API key registration
- —Agent-driven workflows that need to pay per-call using USDC on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers or agents wanting keyless, pay-per-use API access
- —x402-compatible agents that can settle USDC payments on Base
- —Exploring low-cost micropayment API patterns
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
- —Use cases requiring free or trial access before committing payment
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/44 \
-H "Content-Type: application/json"
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid payment 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/44",
"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, no OpenAPI schema, no request/response examples, and no explanation of what "Premium API Access" actually returns. The docs/pricing/API pages are all blank beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet' with no content
- —No OpenAPI or schema describing request parameters or response format
- —The endpoint path '/api/v1/stripe/subscriptions/44' suggests Stripe subscription management but this is unconfirmed
- —Unknown what data or functionality is returned after successful payment
- —Platform appears to be early-stage with many advertised endpoints but no verifiable documentation
Citations
- —Endpoint returns a 402 x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/stripe/subscriptions/44
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com