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 suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/charges/109` is listed as "Premium API Access" but its exact functionality is not documented beyond that label. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint returns. The platform's landing page lists 16 endpoints across four categories but does not clarify which charge ID maps to which service. Prospective users should be aware that without documentation, the actual behavior of this endpoint is unknown.
Capabilities
Use cases
- —Agent-initiated API calls with automatic per-request USDC micropayments
- —Accessing paid API services without traditional API key registration
- —Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints
Fit
Best for
- —Developers or agents wanting keyless, pay-per-call API access on Base
- —x402-compatible clients that can settle USDC micropayments automatically
- —Low-commitment API usage with no subscriptions or minimums
Not for
- —Users who need detailed API documentation or guaranteed SLAs before paying
- —High-volume use cases where $0.02/request adds up without bulk discounts
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/109 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' (charges/109) is completely undocumented. All non-landing pages return only 'Connect wallet' with no content.
Warnings
- —No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'
- —The specific functionality of /api/v1/charges/109 ('Premium API Access') is not described anywhere
- —No OpenAPI schema or request/response examples provided
- —No way to determine what data or service this endpoint actually returns without paying
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (=$0.02)https://lowpaymentfee.com/api/v1/charges/109
- —The platform lists 16 endpoints across four categories all priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/109
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs