Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a suite of endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). 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 minimum commitments.
The specific endpoint being listed here (`/api/v1/orders/22`) is described as "Premium API Access" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is handled via the x402 exact scheme: callers include an X-PAYMENT header with a signed payment authorization, and the server settles on-chain before returning the response. The timeout for payment settlement is 300 seconds.
Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but what the `/api/v1/orders/22` endpoint actually returns upon successful payment is unknown from the available sources.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting reports with instant crypto-settled micropayments
- —Using utility services like geocoding, validation, and conversion without rate limits
Fit
Best for
- —Developers who want instant API access without registration or API keys
- —Agents and bots that can settle x402 payments autonomously on Base
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
Not for
- —High-volume production workloads where a flat-rate subscription would be cheaper
- —Users without a Base-compatible wallet or USDC holdings
- —Anyone needing detailed API documentation or SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/22 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages beyond the landing page are empty ("Connect wallet" only). The specific purpose of /api/v1/orders/22 is unclear — it's labeled generically as "Premium API Access" with no further detail.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All doc/pricing/README pages return only a 'Connect wallet' prompt with no content
- —The specific endpoint /api/v1/orders/22 is not listed among the advertised APIs on the landing page; its actual function is unclear
- —No examples or error documentation found
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/orders/22
- —Payment timeout is 300 seconds, scheme is exact, x402 version 1https://lowpaymentfee.com/api/v1/orders/22