Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.
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/93` is listed as "Premium API Access" and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per call) settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
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. The platform emphasizes no API keys, no rate limits, and instant access.
However, the specific `/api/v1/customers/93` endpoint's purpose is unclear — it does not map to any of the documented API categories on the landing page. There is no OpenAPI schema, no detailed documentation (docs, pricing, and README pages all render only a "Connect wallet" prompt), and no request/response examples are available. The endpoint is confirmed live via a valid 402 challenge, but what data it actually returns when paid is unknown.
Capabilities
Use cases
- —Accessing premium data via a single USDC micropayment without needing an API key
- —Agent-driven workflows that need low-friction, per-call API access on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-use API access
- —Low-cost micropayment API consumption on Base network
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone requiring non-USDC or non-Base payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no request/response examples, and the specific /api/v1/customers/93 endpoint's purpose is not explained anywhere in the crawled material. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — docs/pricing/README pages all render only 'Connect wallet'
- —The endpoint path /api/v1/customers/93 does not correspond to any documented API category on the landing page
- —No request body schema or response examples are available; actual behavior when paid is unknown
- —Platform appears to be a demonstration or early-stage project with minimal documentation
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/customers/93
- —All endpoints are priced at $0.02 per 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
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/customers/93