Pay-per-call premium API access via x402 on Base network, settled in USDC at $0.02/request.
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 platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility services. All endpoints share a uniform pricing model of $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/stripe/invoices/102` accepts POST requests and returns JSON. The x402 challenge confirms it is live, advertising a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout.
Documentation on the site is minimal — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt, suggesting the platform is wallet-gated for detailed documentation. No OpenAPI spec, request/response schemas, or usage examples are publicly available beyond the landing page listing.
Capabilities
Use cases
- —Accessing premium API data without subscription or API key management
- —Making one-off paid API calls settled instantly in USDC on Base
- —Integrating pay-per-use endpoints into autonomous agent workflows
Fit
Best for
- —Developers wanting zero-commitment pay-per-call API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users without a Base-network USDC wallet
- —Applications requiring detailed public API documentation before integration
- —High-volume use cases where per-request pricing may be cost-inefficient compared to subscriptions
Quick start
# 1. Send POST with X-PAYMENT header containing x402 payment proof
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/102 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples of what the endpoint actually returns. The purpose of 'stripe/invoices/102' is unclear.
Warnings
- —No public documentation available — docs/pricing/README pages are wallet-gated
- —No request or response schema provided; actual functionality of /stripe/invoices/102 is unknown
- —Purpose of this specific endpoint is ambiguous — 'Premium API Access' is generic
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge confirms live status with maxAmountRequired of 20000 base units USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/102