Pay-per-request API platform on Base network via x402 — $0.02/call 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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.
The specific endpoint listed here (`/api/v1/orders/72`) is described as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing shown on the landing page.
The platform advertises four endpoint categories: 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). However, no OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl — the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Agent-driven data retrieval with inline USDC micropayments
- —On-demand AI inference (sentiment, summarization, classification) without API key management
- —Fetching real-time crypto quotes and gas estimates via pay-per-request
- —Geocoding and data conversion as utility microservices
Fit
Best for
- —Developers and agents wanting zero-signup, pay-as-you-go API access
- —x402-compatible agents that can settle USDC on Base
- —Use cases requiring low-cost, high-frequency API calls without rate limits
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring guaranteed SLAs or enterprise support
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/72 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and all doc/pricing/README pages return only a wallet-connect prompt. The specific purpose of /api/v1/orders/72 ('Premium API Access') is vague and undocumented.
Warnings
- —No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'
- —The specific endpoint /api/v1/orders/72 has a generic 'Premium API Access' description with no details on what it returns
- —No example request or response payloads could be found
- —The breadth of advertised capabilities (AI, finance, geocoding, etc.) could not be verified beyond the landing page listing
Citations
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/orders/72 advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Basehttps://lowpaymentfee.com/api/v1/orders/72
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/orders/72
- —Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com