Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request 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, settled in USDC on the Base network via the x402 protocol.
The specific endpoint at `/api/v1/keys/64` is listed as "Premium API Access" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is made by including an X-PAYMENT header; no API keys, subscriptions, or rate limits are advertised. The platform accepts POST requests and returns application/json responses.
Documentation is minimal — the landing page lists available endpoints and pricing but the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the `/api/v1/keys/64` "Premium API Access" endpoint is unclear from the available information.
Capabilities
Use cases
- —Agent-driven data retrieval with per-call USDC micropayments
- —On-demand AI inference (sentiment, summarization, classification, embeddings) without subscriptions
- —Fetching real-time crypto prices, gas estimates, and exchange rates via pay-as-you-go calls
- —Geocoding, data validation, and format conversion as utility microservices
- —Accessing premium API keys or resources gated behind x402 payment
Fit
Best for
- —Developers and agents wanting zero-commitment, pay-per-use API access
- —Crypto-native applications that can settle payments in USDC on Base
- —Prototyping and low-volume use cases where $0.02/request is cost-effective
Not for
- —High-volume production workloads where per-request pricing becomes expensive
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/keys/64 \
-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 OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/keys/64 ('Premium API Access') is unexplained. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available
- —The exact functionality of /api/v1/keys/64 'Premium API Access' is not documented anywhere in the crawled material
- —All documentation pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content
- —No request or response examples available
Citations
- —All endpoints priced at $0.02 per request with no minimums or commitmentshttps://lowpaymentfee.com
- —Payment settled in USDC on Base network via x402 protocolhttps://lowpaymentfee.com
- —Endpoint /api/v1/keys/64 returns 402 with maxAmountRequired of 20000 base units (0.02 USDC)https://lowpaymentfee.com/api/v1/keys/64
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —No API keys or rate limits advertisedhttps://lowpaymentfee.com