x402-gated premium API access on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The specific resource at `/api/v1/charges/29` 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 (USD Coin) on Base with no API keys, rate limits, or commitments required.
The x402 challenge confirms the endpoint is live, accepting POST requests and settling payments via the "exact" scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. The response MIME type is `application/json`. The timeout for payment is 300 seconds.
However, the specific functionality behind `/api/v1/charges/29` is not documented beyond the label "Premium API Access." The provider's landing page lists many other endpoints with descriptive names (sentiment analysis, geocoding, price feeds, etc.), but this particular path does not appear in those listings. No OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Accessing a pay-per-call API endpoint without needing API keys or subscriptions
- —Programmatic agent-driven API consumption with on-chain USDC micropayments
- —Testing x402 payment flows on Base network
Fit
Best for
- —Developers or agents wanting frictionless pay-per-request API access
- —x402-compatible clients on the Base network
- —Use cases where avoiding API key management is valuable
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-network USDC wallet or x402-compatible client
- —High-volume use cases where per-request pricing at $0.02 may be costly
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/29 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/charges/29 is undefined. The docs pages are empty beyond a wallet connect prompt.
Warnings
- —The specific functionality of /api/v1/charges/29 ('Premium API Access') is not described anywhere in the crawled content.
- —No OpenAPI spec, request schema, or response schema available.
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no useful content.
- —This endpoint path does not appear in the provider's listed API catalog 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 of USDC on Base networkhttps://lowpaymentfee.com/api/v1/charges/29
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/charges/29
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/29