Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/55` is listed as "Premium API Access" and returns `application/json` via POST. Its x402 challenge advertises a max amount of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.
Documentation is extremely thin: the /docs, /pricing, /api, 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 usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but the actual behavior and response format of `/api/v1/customers/55` is unclear from available materials.
Capabilities
Use cases
- —Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payment
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) without subscription commitments
- —Accessing utility services (geocoding, validation, conversion) on a pay-as-you-go basis
- —Integrating agent-driven workflows that settle API costs in USDC on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access settled on-chain
- —AI agents that need to autonomously purchase API calls via x402
- —Projects already operating on Base network with USDC liquidity
Not for
- —High-volume production workloads needing guaranteed SLAs and detailed documentation
- —Users without a Base-compatible wallet or USDC holdings
- —Applications requiring well-documented request/response schemas before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/55 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the purpose of '/api/v1/customers/55' specifically is opaque. The docs pages are empty stubs.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —The specific endpoint /api/v1/customers/55 is labeled 'Premium API Access' but its actual function is unclear — it does not appear in the landing page catalog
- —Cannot verify what data or service this endpoint actually returns without making a paid request
Citations
- —Platform offers endpoints at $0.02/request with no API keys, no rate limits, 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/customers/55
- —Platform lists endpoints for analytics, AI, finance, and utility categorieshttps://lowpaymentfee.com