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 across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. 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/transfers/178` is listed as "Premium API Access" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The x402 challenge confirms the endpoint is live and uses the "exact" payment scheme with a 300-second timeout.
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 per call. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas for this specific endpoint and others remain undocumented.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing
- —Testing x402 payment flows on Base network at low cost
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 production workloads where $0.02/request adds up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Consumers without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/178 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema documentation, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The purpose of this specific '/transfers/178' endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No API documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no technical content.
- —The specific purpose and expected input/output of /api/v1/transfers/178 is undocumented; 'Premium API Access' is a generic label.
- —No OpenAPI or schema information is provided for any endpoint on the platform.
- —The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented request/response formats.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/transfers/178
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com