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 variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/charges/183` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.
The broader platform advertises endpoints in 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). However, documentation pages (docs, pricing, README) all resolve to a minimal "Connect wallet" page with no substantive content, so the actual behavior and response schemas of these endpoints are undocumented.
Capabilities
Use cases
- —Accessing analytics and data feeds without subscription or API key management
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
- —Fetching real-time crypto prices, gas estimates, and exchange rates
- —Geocoding, validation, and data conversion utilities
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing quick access to diverse utility endpoints without onboarding
Not for
- —High-volume production workloads where per-request pricing may add up
- —Users who need detailed API documentation, SDKs, or SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/183 \
-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 pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty stubs. The specific purpose of '/api/v1/charges/183' beyond 'Premium API Access' is unclear. This is effectively a stub listing.
Warnings
- —No API documentation available — all doc pages resolve to a minimal 'Connect wallet' stub
- —The specific endpoint /api/v1/charges/183 has no description beyond 'Premium API Access'; its actual functionality is unknown
- —No request or response schema is documented anywhere
- —No OpenAPI spec or machine-readable API description found
Citations
- —All endpoints priced at $0.02/request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)https://lowpaymentfee.com/api/v1/charges/183
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/charges/183