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. The specific resource at `/api/v1/charges/175` 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 x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per call. The payment timeout is 300 seconds. The response MIME type is `application/json`.
However, the specific functionality behind `/api/v1/charges/175` is not documented — the description is simply "Premium API Access" with no further detail on what data or service it returns. The provider's docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional technical documentation or schema information. This makes it difficult to determine the exact input parameters or output format for this particular endpoint.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base for per-call access
- —Users who want no-commitment, pay-as-you-go API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
- —Use cases requiring known, well-documented input/output schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/175 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and network. However, the specific functionality of /api/v1/charges/175 is entirely undocumented — no input schema, no output schema, no examples, and all doc pages render only 'Connect wallet'. The listing is effectively a stub with confirmed liveness but unknown utility.
Warnings
- —The exact functionality of /api/v1/charges/175 is undocumented; 'Premium API Access' is the only description available.
- —All documentation pages (docs, api, pricing, README) render only 'Connect wallet' with no technical content.
- —No OpenAPI spec, input schema, or output schema is available for this endpoint.
- —The provider lists many other endpoints but this specific charge ID (175) does not map to any named endpoint on the landing page.
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/charges/175
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/175
- —Payment timeout is 300 secondshttps://lowpaymentfee.com/api/v1/charges/175