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 set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using the x402 protocol, settling in USDC on the Base network. The platform advertises a flat $0.02 per request with no API keys, no rate limits, and instant access.
The specific endpoint at `/api/v1/charges/30` is labeled "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 exact scheme with a 300-second timeout.
The platform lists 16 endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & ML (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). However, documentation pages beyond the landing page returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas, supported parameters, and output formats for any of these endpoints remain unknown.
Capabilities
Use cases
- —Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments
- —Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management
- —Accessing utility services like geocoding, validation, and data conversion on a pay-as-you-go basis
- —Exporting data or generating analytics reports with no subscription commitment
Fit
Best for
- —Agents or developers who want zero-signup, pay-per-use API access
- —Crypto-native applications that can settle payments in USDC on Base
- —Prototyping or low-volume use cases where $0.02/request is cost-effective
Not for
- —High-volume production workloads where per-request pricing adds up quickly
- —Users who need detailed API documentation, schemas, or SLAs before integrating
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/30 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, and the landing page lists available endpoints with pricing. However, all documentation pages are empty (just 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and no examples. The purpose of this specific '/api/v1/charges/30' endpoint labeled 'Premium API Access' is unclear — it may be a generic charge endpoint rather than a specific functional API. Effectively a stub listing.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —No OpenAPI or schema definitions found for any endpoint
- —The specific endpoint '/api/v1/charges/30' is labeled generically as 'Premium API Access' with no indication of what data or functionality it provides
- —No request/response examples or parameter documentation available
- —Cannot verify what any of the 16 listed endpoints actually return
Citations
- —Platform lists 16 endpoints across data, AI, finance, and infrastructure categories, all at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02/request with no API keys, no rate limits, instant access, on Base networkhttps://lowpaymentfee.com
- —x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/charges/30