Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments — payment is handled inline via the x402 protocol on the Base network using USDC.
The specific endpoint at `/api/v1/orders/19` is labeled "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.
The broader platform lists additional endpoints across four 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the crawled documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so details about request/response schemas, supported parameters, and actual data sources remain unknown.
Capabilities
Use cases
- —Agents that need on-demand API access without pre-registration or API keys
- —Programmatic access to analytics, AI inference, or financial data with per-call USDC payment
- —Testing x402 payment flows on the Base network
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or sporadic API consumers who don't want subscriptions
Not for
- —High-volume consumers needing bulk pricing or SLAs
- —Users without a Base-network USDC wallet
- —Anyone requiring detailed API documentation or guaranteed uptime
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/19 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"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 of request/response formats, no examples, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The purpose of this specific '/orders/19' endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No request or response schema available — the actual data returned by this endpoint is unknown.
- —Documentation pages (/docs, /pricing, /README) contain no substantive content.
- —The specific purpose of /api/v1/orders/19 ('Premium API Access') is not explained; it may be a generic or placeholder endpoint.
- —The broader platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have documented schemas or verifiable functionality.
Citations
- —Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/orders/19
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/orders/19