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 variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, rate limits, or subscriptions required.
The specific endpoint at `/api/v1/charges/265` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address, with a 300-second timeout.
The broader platform advertises endpoints in four categories: 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the crawled documentation pages (docs, api, pricing, README) returned only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas, supported parameters, and output formats for these endpoints remain unknown.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) on a pay-per-call basis without API keys
- —Fetching real-time crypto token quotes, gas estimates, and exchange rates
- —Running data analytics queries and exporting reports with per-request billing
- —Geocoding, validation, and conversion utilities paid in USDC on Base
Fit
Best for
- —Developers who want instant API access without signup or API key management
- —Agents and bots that can settle micropayments in USDC on Base via x402
- —Projects needing low-cost, low-friction access to diverse utility and AI endpoints
Not for
- —Users who need detailed API documentation and well-defined schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Teams requiring non-crypto payment methods or fiat invoicing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/265 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing, but the endpoint's actual functionality behind "Premium API Access" is undefined. Documentation pages all returned only a wallet-connect prompt with no technical content, schemas, or examples. The listing is effectively a stub with pricing info.
Warnings
- —The endpoint description 'Premium API Access' is generic and does not describe what the endpoint actually does or returns.
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable technical content.
- —No OpenAPI spec, request schema, or response schema is available — integration requires trial and error.
- —The specific functionality of /api/v1/charges/265 versus the other listed endpoints is unclear.
Citations
- —Flat pricing of $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —Endpoints span Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/charges/265
- —Payment timeout is 300 seconds, scheme is exact, network is Basehttps://lowpaymentfee.com/api/v1/charges/265