Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/resource/49` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is individually paid for via the X-PAYMENT header.
The broader lowpaymentfee.com platform advertises 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 listed endpoints are priced at $0.02 per request. However, the specific `/api/resource/49` endpoint does not clearly map to any of these named services — its exact functionality is not documented beyond the generic "Premium API Access" label.
Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what data or computation `/api/resource/49` actually returns. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation it is difficult to know what to send or what to expect back.
Capabilities
Use cases
- —Accessing premium data or computation without API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Integrating pay-per-request endpoints into agent workflows via x402
Fit
Best for
- —Developers who want zero-signup, pay-as-you-go API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or schemas before integrating
- —Anyone without a Base-compatible USDC wallet
- —High-volume consumers who need bulk pricing or rate guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/resource/49 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/resource/49 is completely undocumented. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —The exact functionality of /api/resource/49 is undocumented — 'Premium API Access' is the only description available.
- —No OpenAPI schema, request format, or response examples are provided anywhere.
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content.
- —Cannot verify what data or computation this endpoint actually returns without making a paid request.
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/resource/49
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/resource/49
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com