Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource `/api/v1/charges/323` is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 `exact` scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
However, the specific functionality behind `/api/v1/charges/323` is unclear — it does not map to any of the named endpoints listed on the provider's homepage (analytics, AI, finance, utils). The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further documentation. Without an OpenAPI spec, request/response schemas, or detailed docs, it is difficult to determine what data or service this particular endpoint returns.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without traditional API key management
- —Agent-driven workflows that need on-demand API calls settled in USDC on Base
- —Integrating pay-per-use services into Web3 applications
Fit
Best for
- —Developers wanting keyless, pay-per-request API access
- —AI agents with x402-compatible wallets on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —Applications requiring free or fiat-only payment methods
- —High-volume use cases where per-request pricing may add up without bulk discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/323 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific endpoint path /api/v1/charges/323 does not correspond to any documented service. Effectively a stub listing.
Warnings
- —The endpoint path /api/v1/charges/323 does not match any of the named APIs listed on the homepage — its specific functionality is unknown.
- —No OpenAPI spec, request schema, or response schema is available.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.
- —Without knowing what this endpoint returns, callers cannot predict the response format.
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/charges/323
- —Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com