Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.
The specific endpoint at `/api/v1/customers/19` is listed as "Premium API Access" and returns JSON. Based on the x402 challenge, it accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/customers/19` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality "Premium API Access" provides for this specific customer resource.
Capabilities
Use cases
- —Accessing premium data or customer records via a single paid API call
- —Integrating pay-per-use API endpoints into agent workflows without API key management
- —Programmatic access to analytics, AI, finance, or utility services at micro-transaction pricing
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments on Base in USDC
- —Projects needing low-cost per-request pricing without subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request crypto settlement overhead matters
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/19 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of the specific '/api/v1/customers/19' endpoint is unclear. The listing is effectively a stub.
Warnings
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content.
- —No OpenAPI or schema available — request and response formats are unknown.
- —The specific purpose of /api/v1/customers/19 ('Premium API Access') is undocumented; it is unclear what data it returns.
- —The broader platform lists many endpoints but none have documented schemas or examples.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/customers/19
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com