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 paid per-request using the x402 protocol, settling in USDC on the Base network. The specific endpoint at `/api/v1/accounts/2` is labeled "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call.
The platform advertises categories including 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The actual behavior and response format of the `/api/v1/accounts/2` endpoint is unknown beyond its x402 challenge metadata, which indicates it accepts HTTP POST and returns `application/json`.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time finance and crypto market data on a per-request payment basis
- —Running data analytics queries and exporting data with no subscription commitment
- —Using utility services like geocoding and validation with instant crypto-settled payments
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can autonomously pay for API calls via x402/USDC on Base
- —Projects needing low-cost micro-transactions for diverse API services
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/2 \
-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 it accepts USDC payments on Base at $0.02/request. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The actual functionality of the /api/v1/accounts/2 endpoint is unclear beyond its label 'Premium API Access'.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt
- —No OpenAPI or schema documentation available for any endpoint
- —The specific purpose and response format of /api/v1/accounts/2 ('Premium API Access') is undocumented
- —No request body schema or example responses are available — integration requires trial and error
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The /api/v1/accounts/2 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (USD Coin, 6 decimals = $0.02) on Basehttps://lowpaymentfee.com/api/v1/accounts/2
- —Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompt with no technical contenthttps://lowpaymentfee.com/docs