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 at `/api/v1/payments/8` is labeled "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header.
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 $0.02 per request. However, the specific functionality behind the `/api/v1/payments/8` endpoint is not documented beyond its "Premium API Access" label, and the crawled docs/pricing/README pages returned only a wallet-connect prompt with no additional content.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with USDC on Base (contract 0x8335…2913). The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The response MIME type is application/json and the input method is POST. Due to the lack of documentation about what this specific endpoint actually returns or what input it expects, agents should treat this as an exploratory integration.
Capabilities
Use cases
- —Paying per-request for API access without subscriptions or API keys
- —Integrating x402-compatible agents with low-cost USDC micropayments on Base
- —Accessing premium API functionality with crypto-native payment rails
Fit
Best for
- —Agents or developers wanting zero-commitment, pay-as-you-go API access
- —x402-compatible wallets and agent frameworks on Base
- —Use cases requiring no rate limits and instant access
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Applications requiring non-crypto payment methods
- —Developers who need to understand exact request/response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/8 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation about what this specific endpoint does, what inputs it accepts, or what it returns. The docs, pricing, and README pages all returned only a wallet-connect prompt. The listing is effectively a stub with pricing info only.
Warnings
- —No documentation available for /api/v1/payments/8 — the endpoint's actual functionality is unknown
- —Docs, pricing, and README pages returned only a wallet-connect prompt with no usable content
- —No request or response schema is available; agents must discover behavior experimentally
- —The platform lists many API categories but it is unclear which are actually functional
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/8
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/8
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com