Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It 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, payable in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/payments/242` returns a valid x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" scheme. The endpoint accepts POST requests and returns `application/json` responses.
However, the exact functionality behind this particular `/payments/242` path is not documented beyond the generic label "Premium API Access." The provider's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, embeddings, price feeds, geocoding, etc.) but does not describe what `/api/v1/payments/242` specifically returns. Documentation pages (`/docs`, `/pricing`, `/README`) all render only a "Connect wallet" prompt with no further content. Without clearer documentation, callers should treat this as an opaque premium endpoint whose response schema is unknown.
Capabilities
Use cases
- —Programmatic pay-per-call access to premium data or services without API key management
- —Agent-driven workflows that need on-chain USDC micropayments for API consumption
- —Testing x402 payment protocol integrations on Base network
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —AI agents that can settle USDC payments on Base
- —Users who want no-commitment, no-signup API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where $0.02/request adds up significantly
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/242 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/payments/242 is undocumented. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The listing is essentially a stub with confirmed pricing.
Warnings
- —The exact functionality of /api/v1/payments/242 is not documented — 'Premium API Access' is the only description available.
- —All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI spec or request/response schema is available for this endpoint.
- —The provider lists many other endpoints on its landing page but none match this specific path, suggesting it may be a generic or catch-all route.
Citations
- —Endpoint returns HTTP 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/242
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/242
- —Documentation pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs