Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/customers/92` is listed as "Premium API Access" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.
However, the specific endpoint being listed here (`/api/v1/customers/92`) does not clearly map to any of the documented API categories. Its purpose — what data or service it actually returns — is not described in the available documentation. The docs, pricing, and README pages all render only a "Connect wallet" prompt with no further content. Without a response schema or example output, callers should treat this endpoint as opaque until they can inspect an actual paid response.
Capabilities
Use cases
- —Accessing a premium data endpoint with per-call USDC micropayments
- —Integrating pay-as-you-go API calls into agent workflows without API key management
- —Testing x402 protocol payment flows on Base network
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or response schemas before purchasing
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/92 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what this specific endpoint returns, no response schema, no example payloads, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The endpoint path (/api/v1/customers/92) doesn't match any documented category, making its purpose unclear.
Warnings
- —The specific endpoint /api/v1/customers/92 is not described in any of the site's documented API categories — its actual function is unknown.
- —All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content.
- —No output schema or example response is available; callers cannot know what they are paying for without making a paid request.
- —The endpoint path suggests it may return customer-specific data, which could raise privacy or data-handling concerns.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/customers/92
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/customers/92
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com