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 pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/orders/21` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all subpages just show "Connect wallet"), so the actual behavior and response schemas of individual endpoints are undocumented.
Capabilities
Use cases
- —Accessing premium API data without managing API keys or subscriptions
- —Making one-off paid API calls from autonomous agents using x402 protocol
- —Integrating low-cost per-request services into workflows settled on Base L2
Fit
Best for
- —Agents or developers who want zero-setup, pay-as-you-go API access
- —x402-compatible clients looking for cheap per-call endpoints on Base
- —Prototyping integrations where $0.02/request is acceptable overhead
Not for
- —Users who need detailed API documentation or response schema guarantees before integrating
- —High-volume production workloads where per-request crypto settlement adds latency
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/21 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no documentation of request/response formats, and all doc/pricing/API subpages are empty stubs showing only 'Connect wallet'. The specific purpose of /api/v1/orders/21 ('Premium API Access') is vague and undifferentiated from the rest of the catalog. Effectively a stub listing.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'
- —No OpenAPI or schema available; request body format and response structure are unknown
- —The endpoint path '/api/v1/orders/21' with description 'Premium API Access' is generic and its specific function is unclear
- —The broader platform lists many endpoint categories but none have documented schemas or examples
Citations
- —Uniform pricing of $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeouthttps://lowpaymentfee.com/api/v1/orders/21
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com