Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint at `/api/v1/products/73` is listed as "Premium API Access" and returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.
The broader platform advertises 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the crawled documentation pages (docs, pricing, API, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual functionality behind these endpoints cannot be independently verified from the crawl data alone.
Capabilities
Use cases
- —Accessing premium API data without needing to register or manage API keys
- —Making one-off API calls with instant USDC micropayments on Base
- —Agent-driven workflows that need frictionless pay-per-use endpoints
Fit
Best for
- —Developers or agents wanting keyless, pay-as-you-go API access
- —x402-compatible clients on the Base network
- —Low-volume or sporadic API consumers who don't want subscriptions
Not for
- —Users without USDC on Base network or an x402-compatible client
- —High-volume consumers who need bulk pricing or SLAs
- —Anyone requiring detailed documentation or guaranteed uptime commitments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/products/73 \
-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. However, all documentation pages returned only 'Connect wallet' with no actual content, there is no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/products/73' specifically is unclear beyond the generic label 'Premium API Access'. The platform's broad claims about many endpoint categories cannot be verified.
Warnings
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content
- —No OpenAPI or schema documentation available for any endpoint
- —The specific functionality of /api/v1/products/73 ('Premium API Access') is not described anywhere
- —The broad catalog of endpoints advertised on the homepage cannot be verified from crawl data
Citations
- —Endpoint returns 402 with x402 challenge requesting up to 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/products/73
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/products/73
- —Platform lists categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com