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, rate limits, or commitments required.
The specific endpoint `/api/v1/payments/172` returned a live 402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
However, the actual functionality behind this particular endpoint path (`/payments/172`) is unclear — the site's landing page lists endpoints under analytics, AI, finance, and utility categories, but does not specifically describe a `/payments/172` route. Documentation pages (/docs, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content. Without documentation or schema details, the exact request format and response structure for this endpoint remain unknown.
Capabilities
Use cases
- —Accessing paid API services without API key registration
- —Making micropayment-gated API calls settled in USDC on Base
- —Agent-driven pay-per-use API consumption via x402 protocol
Fit
Best for
- —Developers wanting zero-signup pay-per-call API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or schemas before integrating
- —High-volume use cases where per-call pricing may add up quickly
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/172 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/payments/172 is not described anywhere in the crawled material. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt.
Warnings
- —The specific endpoint /api/v1/payments/172 is not listed or described on the site's landing page — its actual functionality is unknown.
- —All documentation pages (/docs, /pricing, /README) returned no useful content, only a 'Connect wallet' prompt.
- —No request or response schema is available; callers cannot know what to send or expect back.
- —The endpoint path suggests it may be a generic or dynamically numbered resource rather than a well-defined API.
Citations
- —The site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all priced at $0.02/request.https://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, instant access, on the Base network.https://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeout.https://lowpaymentfee.com/api/v1/payments/172