Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.
The specific endpoint at `/api/v1/accounts/45` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/accounts/45` endpoint actually returns. The landing page lists 16 different API endpoints across four categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), all at the same $0.02 price point, but provides no detail on request parameters or response formats for any of them.
Capabilities
Use cases
- —Accessing premium API data without creating an account or managing API keys
- —Making one-off API calls with instant USDC micropayments on Base
- —Agent-driven workflows that need frictionless pay-per-use endpoints
Fit
Best for
- —Developers wanting zero-signup API access via crypto micropayments
- —AI agents that can autonomously pay for API calls using x402
- —Users already holding USDC on Base who want low-friction API consumption
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible wallet or USDC holdings
- —High-volume consumers who prefer subscription-based pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/45 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what the /api/v1/accounts/45 endpoint actually does beyond the generic label 'Premium API Access'. The docs, pricing, and README pages are all blank (just 'Connect wallet').
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no content
- —No OpenAPI or schema definition for any endpoint
- —The purpose of /api/v1/accounts/45 is unclear — 'Premium API Access' is a generic label with no further explanation
- —No request parameters or response format documented anywhere
- —Cannot verify what data or service this specific endpoint provides
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base ($0.02)https://lowpaymentfee.com/api/v1/accounts/45
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/45
- —16 endpoints listed across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com