x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402 protocol-based API platform that provides pay-per-request access to a variety of endpoints across data analytics, AI/ML inference, finance/crypto, and infrastructure utilities. All endpoints are gated via the x402 payment protocol on the Base network, accepting USDC (USD Coin) payments. The specific endpoint at `/api/v1/stripe/invoices/93` is labeled "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals).
The platform advertises a simple pricing model: $0.02 per request with no API keys, no rate limits, no minimums, and instant access. Payment is settled on-chain via Base network USDC to the specified wallet address. The x402 challenge confirms the endpoint is live and accepts POST requests with JSON responses.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical content. The actual behavior and response format of this specific invoice endpoint is unknown beyond what the x402 challenge reveals.
Capabilities
Use cases
- —Accessing premium API data without traditional API key registration
- —Making one-off paid API calls settled via on-chain USDC on Base
- —Programmatic invoice retrieval or generation via crypto-native payment
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —Agents or bots that can settle x402 payments on Base
- —Users who prefer crypto-native micropayments over subscription billing
Not for
- —Users who need detailed API documentation or SDKs before integrating
- —Applications requiring high-volume calls where per-request pricing is inefficient
- —Developers without access to USDC on Base network
Quick start
# Send a POST with x402 payment header to access the endpoint
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via 402 challenge with clear pricing and network info, but there is no documentation, no schema for request/response bodies, and no examples. The actual functionality of this specific invoice endpoint is unclear.
Warnings
- —Documentation pages (docs, API, pricing, README) all return only 'Connect wallet' with no usable content
- —No request or response schema available — actual endpoint behavior is unknown
- —The endpoint path '/api/v1/stripe/invoices/93' suggests a specific resource (invoice #93) rather than a general-purpose API
- —No OpenAPI spec or AI plugin manifest found
Citations
- —Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Endpoint accepts USDC (USD Coin) on Base network with maxAmountRequired of 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/stripe/invoices/93
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/stripe/invoices/93