Pay-per-request premium API access via x402 on Base network using USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific endpoint `/api/v1/cards/70` is one of many API endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.
The platform operates on a simple pay-per-request model at $0.02 per call, settled in USDC on the Base network. No API keys, rate limits, or commitments are required — callers simply attach an x402 payment header to each request. The x402 challenge confirms the endpoint is live and accepts payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum amount of 20,000 base units (i.e., $0.02 USDC given 6 decimals).
However, the specific functionality of `/api/v1/cards/70` is not documented beyond the generic label "Premium API Access." The platform's docs, pricing, and README pages all render only a "Connect wallet" prompt with no further technical documentation. Without additional schema information or response examples, the exact data returned by this endpoint remains unclear.
Capabilities
Use cases
- —Accessing premium data or services without API key registration
- —Making one-off paid API calls settled instantly in USDC on Base
- —Integrating pay-per-request endpoints into agent workflows
Fit
Best for
- —Developers wanting instant API access without signup
- —Agents that can settle x402 payments on Base
- —Users comfortable paying per request in USDC
Not for
- —Users needing detailed documentation or response schemas before integrating
- —High-volume callers who prefer subscription-based pricing
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/cards/70 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what /api/v1/cards/70 actually returns, no input/output schema, and the docs pages are empty. The specific purpose of this endpoint is unknown.
Warnings
- —No documentation available — docs, pricing, and README pages only show 'Connect wallet'
- —The specific functionality of /api/v1/cards/70 is undocumented; 'Premium API Access' is a generic label
- —No input or output schema provided beyond HTTP POST method
Citations
- —Platform charges $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —Endpoint is live and returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/cards/70
- —Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/cards/70