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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 payment protocol allows agents and users to pay per call by attaching a payment header to each HTTP request.
The specific endpoint listed here (`/api/v1/customers/88`) is described as "Premium API Access" and returns JSON. Its x402 challenge advertises a max amount of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.
The broader platform 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 pages exist but appear to require a wallet connection and contain no visible content beyond that prompt, so detailed request/response schemas are not available.
Capabilities
Use cases
- —Agents making one-off API calls without needing API key registration
- —Paying per request for AI inference tasks like sentiment analysis or summarization
- —Fetching real-time crypto price feeds or gas estimates with micropayments
- —Geocoding or data validation on a pay-as-you-go basis
- —Exporting data or generating analytics reports without subscription commitments
Fit
Best for
- —AI agents that need frictionless, keyless API access via x402
- —Developers who want pay-per-use pricing without subscriptions
- —Web3-native applications already operating on the Base network
Not for
- —High-volume use cases where per-request pricing becomes expensive compared to bulk plans
- —Users who need detailed API documentation and request/response schemas before integrating
- —Applications requiring non-USDC or non-Base-network payment settlement
Quick start
# POST with x402 payment header (pseudocode)
curl -X POST https://lowpaymentfee.com/api/v1/customers/88 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty (wallet-gated). The specific purpose of /api/v1/customers/88 is unclear beyond the generic 'Premium API Access' label, and it doesn't match any of the advertised endpoint categories on the homepage.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no visible content — docs are effectively inaccessible without wallet connection.
- —The specific endpoint /api/v1/customers/88 is not listed among the advertised APIs on the homepage; its actual functionality is unknown.
- —No request or response schema is available; integration requires trial-and-error or wallet-gated docs.
- —No OpenAPI specification or AI plugin manifest found.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/customers/88
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs