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 variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform 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/charges/208` is labeled "Premium API Access" in the x402 challenge. The challenge confirms it accepts exact-scheme payments on Base, with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
However, the exact functionality behind this specific `/charges/208` endpoint is unclear. The platform's landing page lists many distinct API paths (analytics, AI, finance, utilities), but `/api/v1/charges/208` does not appear among them. There is no OpenAPI spec, no detailed documentation (docs/pricing/README pages all render only a wallet-connect prompt), and no request/response schema beyond the basic x402 outputSchema. Without further documentation, the precise data or service returned by this endpoint cannot be confirmed.
Capabilities
Use cases
- —Accessing paid API services without traditional API key registration
- —Making one-off programmatic requests with per-call USDC micropayments
- —Integrating pay-as-you-go API access into agent workflows on Base
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring high-throughput, free-tier access
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/208 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/charges/208 is undocumented — it doesn't appear in the site's listed APIs. No OpenAPI spec, no request/response examples, and all documentation pages render only a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The endpoint path /api/v1/charges/208 does not match any of the documented API paths on the landing page — its actual functionality is unknown.
- —No OpenAPI specification or detailed documentation is available; docs, pricing, and README pages only show a wallet-connect prompt.
- —No request body schema or response schema is documented, so callers cannot know what to send or what to expect back.
- —The platform lists many API categories but provides no evidence that any of them return real data — treat with caution.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/charges/208
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Payment timeout is 300 seconds, payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/charges/208