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 data, and utility services. 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/charges/80` 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.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages only show a "Connect wallet" prompt), so the actual request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Accessing utility or data APIs without creating an account or managing API keys
- —Making one-off API calls with instant crypto micropayments
- —Integrating pay-per-use endpoints into autonomous agent workflows
Fit
Best for
- —Developers who want zero-signup API access via crypto payments
- —AI agents that need programmatic, keyless API consumption
- —Users already on the Base network with USDC
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume consumers who prefer subscription-based pricing
- —Developers without access to USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/80 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc/pricing/API pages render only a wallet-connect prompt. No request or response schemas are available for any endpoint, and the purpose of this specific '/charges/80' path versus the other advertised endpoints is unclear.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no usable API docs exist.
- —No request or response schema is documented for any endpoint, including this one.
- —The specific function of /api/v1/charges/80 ('Premium API Access') is unclear — it does not match any of the named endpoints on the landing page.
- —The platform's actual data sources and AI model details are completely undocumented.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/charges/80
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com