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 & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint at `/api/v1/charges/82` is labeled "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is via the x402 exact scheme. The endpoint accepts POST requests and returns application/json.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, API reference) returned only a "Connect wallet" prompt with no substantive content, so the actual capabilities and response schemas of individual endpoints remain unverified beyond the landing page descriptions.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis
- —Running geocoding, validation, or data conversion tasks with micropayments
- —Integrating pay-per-use data analytics and reporting into agent workflows
Fit
Best for
- —Agents needing low-friction, keyless API access via x402 micropayments
- —Developers who want to avoid subscription commitments for occasional API calls
- —Web3-native applications that can settle payments in USDC on Base
Not for
- —High-volume production workloads where per-request pricing at $0.02 adds up quickly
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/82 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but documentation pages are empty (only 'Connect wallet' stubs). There is no OpenAPI schema, no example requests/responses, and no detail on what 'Premium API Access' actually returns. The listing is effectively a stub with pricing info only.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) all return only a 'Connect wallet' prompt with no actual content
- —No OpenAPI or schema available — request/response formats for this endpoint are unknown
- —The endpoint is labeled 'Premium API Access' but there is no description of what data or functionality it provides
- —The broader platform lists many endpoints but none have documented schemas or example payloads
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/charges/82
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com