Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/v1/transfers/133` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all listed endpoints.
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. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior, request schemas, and response formats of these endpoints remain undocumented and unverifiable from the crawl material alone.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscriptions
- —Fetching real-time crypto token quotes and gas estimates on a per-call basis
- —Running geocoding or data validation requests with instant pay-per-use billing
- —Exporting data or generating analytics reports via micropayment-gated endpoints
Fit
Best for
- —Developers who want instant API access without signup or API key management
- —Agents and bots that can settle USDC payments on Base for autonomous API consumption
- —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
Not for
- —High-volume production workloads where per-request costs would accumulate significantly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime commitments
- —Developers without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/133 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and all doc pages return only 'Connect wallet' with no content. The specific purpose of '/api/v1/transfers/133' beyond 'Premium API Access' is unknown.
Warnings
- —No API documentation available — all doc pages (docs, pricing, README) return only 'Connect wallet' with no substantive content
- —The specific functionality of /api/v1/transfers/133 ('Premium API Access') is not described anywhere
- —No request or response schemas are provided for any endpoint
- —The broad range of advertised capabilities (AI, finance, analytics, utilities) cannot be verified from available material
Citations
- —Flat pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transfers/133
- —Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com