Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across 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/Utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint at `/api/v1/wire/135` is listed as "Premium API Access" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USDC = $0.02), consistent with the site's uniform pricing. Payment is made via the x402 exact scheme to a specified wallet address, with no API keys or rate limits required. The endpoint accepts HTTP POST requests and returns application/json.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the "Premium API Access" endpoint specifically returns. The platform's value proposition centers on simplicity and low friction (no keys, no rate limits, instant access), but the lack of documentation makes it difficult to know what data or functionality any given endpoint actually provides.
Capabilities
Use cases
- —Accessing data analytics and metrics via per-call crypto payments
- —Running AI inference (sentiment, summarization, classification, embeddings) without subscriptions
- —Fetching real-time financial data and crypto quotes with no API key
- —Using utility services like geocoding and validation on a pay-as-you-go basis
Fit
Best for
- —Developers who want zero-friction API access without signup or API keys
- —Agents and bots that can settle payments in USDC on Base
- —Users who need occasional API calls without committing to a subscription
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited plans
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/135 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the 'Premium API Access' label gives no indication of what the endpoint actually does. The docs/pricing/API pages are all blank beyond a wallet connect prompt.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —The purpose of /api/v1/wire/135 ('Premium API Access') is completely undocumented — unclear what it returns
- —No request or response examples available anywhere in crawled content
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/wire/135
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs