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 lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning 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 specific endpoint `/api/v1/payments/238` is labeled "Premium API Access" but the crawled material does not clarify what distinguishes it from the other listed endpoints or what data/functionality it returns. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The response MIME type is application/json. No OpenAPI schema, detailed documentation, or example responses were found — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content.
Because the endpoint's actual functionality is undocumented beyond the generic label "Premium API Access," agents should treat this as a low-information listing. The platform appears legitimate and the x402 challenge is well-formed, but without knowing what the endpoint returns, callers cannot predict the response shape or utility.
Capabilities
Use cases
- —Paying per request for API access without needing an API key or subscription
- —Integrating x402-compatible agents with low-cost endpoints on Base
- —Testing x402 payment flows against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access
- —Low-cost micropayment API consumption on Base
Not for
- —Users who need documented, well-specified API contracts
- —Production workloads requiring guaranteed SLAs or detailed response schemas
- —Anyone who needs to know exactly what the endpoint returns before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/238 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payments. However, there is no documentation, no OpenAPI schema, no example requests or responses, and the endpoint's actual functionality is completely opaque beyond the label 'Premium API Access'. The docs/pricing/API pages are empty (wallet-connect only). This is effectively a stub listing.
Warnings
- —Endpoint functionality is undocumented — 'Premium API Access' is the only description available
- —No OpenAPI schema or response examples found
- —Docs, pricing, and API pages render only 'Connect wallet' with no usable content
- —The endpoint path '/api/v1/payments/238' does not appear in the site's listed API catalog, making its purpose unclear
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring up to 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/238
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/238