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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/329` is listed as "Premium API Access" and returns `application/json` via POST.
The site advertises four main categories of APIs: 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 endpoints appear to follow the same x402 payment model, settling on Base via USDC (contract `0x8335…2913`).
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 usage examples available from the crawl. The x402 challenge for this specific endpoint is live and well-formed, confirming the payment flow works, but without documentation it is unclear what input this particular endpoint expects or what data it returns.
Capabilities
Use cases
- —Accessing analytics metrics and reports on a per-call basis without subscriptions
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-request USDC payments
- —Fetching real-time crypto prices, exchange rates, and gas estimates
- —Geocoding, validation, and data conversion utilities
Fit
Best for
- —Developers who want zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments in USDC on Base
- —Projects needing quick access to diverse utility endpoints without API key management
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Anyone unable to pay in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/329 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC payments on Base. However, documentation is essentially nonexistent — every doc/pricing/README page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples for this or any endpoint. The specific purpose of /api/v1/transactions/329 ('Premium API Access') is unexplained.
Warnings
- —No API documentation available — all doc pages render only 'Connect wallet'
- —No OpenAPI or JSON schema describing request inputs or response outputs
- —The specific function of /api/v1/transactions/329 is undocumented; 'Premium API Access' is the only descriptor
- —Cannot verify what data or service this endpoint actually provides
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —x402 challenge is live with maxAmountRequired of 20000 base units USDC (=$0.02) on Basehttps://lowpaymentfee.com/api/v1/transactions/329
- —Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/329