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, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/transactions/170` is listed as "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. 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).
Documentation is extremely sparse — the /docs, /api, /pricing, 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 examples of what any endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality `/api/v1/transactions/170` specifically provides beyond its generic "Premium API Access" label.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Paying per-call for AI inference tasks like sentiment analysis or text summarization
- —Fetching financial data such as exchange rates, token quotes, or gas estimates
- —Geocoding or data validation as a lightweight utility service
Fit
Best for
- —AI agents that need frictionless, keyless API access via x402
- —Developers prototyping with pay-as-you-go endpoints on Base
- —Low-volume or sporadic API consumers who want no commitments
Not for
- —High-volume production workloads where $0.02/request adds up quickly
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/170 \
-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 is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/transactions/170 is unclear beyond the generic 'Premium API Access' label. Pricing is clear ($0.02/request) but everything else must be guessed.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'
- —No OpenAPI or schema documentation available for any endpoint
- —The specific functionality of /api/v1/transactions/170 ('Premium API Access') is undocumented — unclear what it returns
- —No request body schema or response schema is documented anywhere
- —Cannot verify what data or service any of the advertised endpoints actually provide
Citations
- —Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/170
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transactions/170
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com