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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transfers/119` is listed as "Premium API Access" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json responses. The broader platform also advertises 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, /pricing, /api, and /README pages all resolve to a minimal "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind this specific `/transfers/119` endpoint is unclear — the description is generic ("Premium API Access") and does not indicate what data or service it provides. Prospective users should test the endpoint to verify its behavior before relying on it.
Capabilities
Use cases
- —Accessing pay-per-call API services without needing an API key or subscription
- —Making programmatic requests settled in USDC on the Base L2 network
- —Agent-driven API consumption with per-request crypto micropayments
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto-native payment rails over traditional billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Applications requiring free or fiat-billed API access
- —Production workloads that need well-documented request/response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/119 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of this specific endpoint (/transfers/119) is entirely unclear. The crawled docs pages are all empty 'Connect wallet' stubs.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt with no content.
- —The specific purpose of /api/v1/transfers/119 ('Premium API Access') is undocumented and unclear.
- —No OpenAPI spec or request/response schema is provided.
- —No examples of successful responses are available to verify actual functionality.
Citations
- —All endpoints priced at $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/transfers/119
- —Endpoint described as 'Premium API Access' accepting POST with application/json mime typehttps://lowpaymentfee.com/api/v1/transfers/119