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 broad set 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/transfers/104` is listed as "Premium API Access" and its x402 challenge advertises a maxAmountRequired 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 broader platform advertises additional categories of endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 per call.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what input the `/api/v1/transfers/104` endpoint expects or what it returns.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic transfers or data retrieval without subscription overhead
Fit
Best for
- —Developers wanting zero-commitment, pay-per-call API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over API key management
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request pricing may add up vs. subscription plans
- —Developers who cannot settle payments in USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/104 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of the specific '/transfers/104' endpoint is unclear beyond its generic 'Premium API Access' label.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content
- —No OpenAPI or schema definition for request or response payloads
- —The specific purpose of /api/v1/transfers/104 is undocumented; 'Premium API Access' is vague
- —Cannot verify what data or functionality this endpoint actually provides
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —Payment settled in USDC on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/transfers/104
- —Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com