Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/48` is listed as "Premium API Access" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API categories including 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 endpoints are priced at $0.02 per request.
However, the specific endpoint `/api/v1/charges/48` does not clearly map to any of the named API categories on the landing page, and no documentation, request/response schemas, or examples are available beyond the landing page listing. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. Without concrete documentation or schema details for this particular endpoint, it is difficult to determine exactly what data or functionality it returns.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Testing x402 protocol payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 pay-per-call protocols
- —Agents that need keyless, on-demand API access settled in USDC
- —Users who want no-commitment, no-subscription API usage
Not for
- —Users needing well-documented, production-grade APIs with clear schemas
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/48 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no request/response schema, no examples, and the specific endpoint path (/api/v1/charges/48) doesn't correspond to any named service on the landing page. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no content.
- —The endpoint path /api/v1/charges/48 does not match any of the named APIs listed on the landing page; its actual functionality is unknown.
- —No request or response schema is provided; callers cannot know what to send or what to expect back.
- —The platform lists many API categories but none have visible documentation or examples.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/charges/48
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/48
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com