Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transfers/70` is listed as "Premium API Access." Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The broader platform advertises additional endpoints including 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. However, documentation beyond the landing page is essentially empty (pages return only a "Connect wallet" prompt), so the actual behavior and schemas of individual endpoints are not documented.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys
- —Fetching real-time crypto quotes, gas estimates, or exchange rates via micropayment
- —Geocoding or data validation as a lightweight utility call in automated workflows
- —Exporting data or generating analytics reports with per-request billing
Fit
Best for
- —AI agents needing keyless, pay-per-call access to diverse utility endpoints
- —Developers prototyping with low-cost, no-commitment API access on Base
- —Web3-native applications that already hold USDC on Base
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs
- —Callers without USDC on Base or unfamiliar with x402 payment protocol
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/70 \
-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 schema, no request/response examples, and all documentation pages beyond the landing page are empty. The purpose of this specific '/transfers/70' endpoint is unclear — 'Premium API Access' is generic. Effectively a stub listing.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no actual content
- —No OpenAPI or schema available — request body format and response structure are unknown
- —The specific purpose of /api/v1/transfers/70 ('Premium API Access') is not explained anywhere
- —No rate limit or SLA information provided
Citations
- —Platform offers endpoints across data, AI, finance, and infrastructure categories all at $0.02/requesthttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with 300s timeouthttps://lowpaymentfee.com/api/v1/transfers/70
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transfers/70