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 paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/accounts/36` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call.
The platform advertises four broad 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The endpoint is confirmed live via a valid x402 402 challenge, but without documentation it is unclear what this specific `/api/v1/accounts/36` endpoint actually returns or what input it expects beyond a POST request.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis
- —Running data analytics queries and exporting reports with micropayment-based billing
- —Using utility services like geocoding, validation, and conversion without subscription commitments
Fit
Best for
- —Developers who want pay-as-you-go API access without subscriptions or API keys
- —Agents and bots that can settle payments in USDC on Base via x402
- —Projects needing low-cost, low-friction access to a variety of utility and AI endpoints
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume production workloads that would benefit from bulk pricing or rate-limit guarantees
- —Developers without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/36 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and the landing page provides a high-level overview of available APIs and pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of /api/v1/accounts/36 is unclear. This is effectively a stub listing.
Warnings
- —No OpenAPI specification or machine-readable schema available
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no technical content
- —The specific purpose and expected input/output of /api/v1/accounts/36 ('Premium API Access') is undocumented
- —No request or response examples are available from any crawled source
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/accounts/36 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/accounts/36
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com