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/293` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.
The broader platform offers 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 endpoints are listed at the same $0.02/request price point.
However, the specific endpoint being listed here (`/api/v1/charges/293`) is labeled only as "Premium API Access" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages on the site all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The actual behavior behind this endpoint is unknown.
Capabilities
Use cases
- —Accessing a pay-per-call API without needing API keys or subscriptions
- —Making micropayments for API access using USDC on Base
- —Agent-driven API consumption with automatic x402 payment settlement
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without USDC on the Base network
- —High-volume consumers who need bulk pricing or rate-limit guarantees
Quick start
# POST with x402 payment header
curl -X POST https://lowpaymentfee.com/api/v1/charges/293 \
-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 zero documentation about what this specific endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The listing is effectively a stub.
Warnings
- —No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.
- —The endpoint path '/api/v1/charges/293' does not appear in the site's listed API catalog, so its actual functionality is unknown.
- —No OpenAPI schema or request/response examples are available.
- —No information about what 'Premium API Access' actually provides or returns.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.https://lowpaymentfee.com/api/v1/charges/293
- —The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/charges/293