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/222` accepts POST requests and charges per call in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals).
The broader lowpaymentfee.com platform lists multiple API 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 priced at $0.02 per request. However, the specific endpoint `/api/v1/charges/222` is labeled only as "Premium API Access" with no further documentation on what data or functionality it returns.
The service advertises no API keys, no rate limits, and instant access. Payment settles on the Base L2 network using the "exact" scheme. The timeout for payment is 300 seconds. Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without needing API keys or subscriptions
- —Agent-driven pay-per-call workflows settled in USDC on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —AI agents that need keyless, pay-as-you-go API access
- —Low-cost per-request access without rate limits
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Use cases requiring known, well-documented request/response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/222 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI schema, no example request/response, and the description 'Premium API Access' is completely generic. All doc pages return only 'Connect wallet' with no content. It is unclear what this specific endpoint actually does.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt with no content.
- —The endpoint description 'Premium API Access' is generic; the actual functionality of /api/v1/charges/222 is unknown.
- —No OpenAPI schema, no input/output schema beyond the x402 outputSchema stub.
- —No example requests or responses available to verify what the endpoint returns.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network with a 300-second timeout.https://lowpaymentfee.com/api/v1/charges/222
- —The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02 per request.https://lowpaymentfee.com
- —The service advertises no API keys, no rate limits, instant access, and Base network settlement.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content.https://lowpaymentfee.com/docs