Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.
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, paid in USDC on the Base network.
The specific endpoint at `/api/v1/transfers/116` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 protocol with an `exact` scheme — no API keys, subscriptions, or rate limits are required. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the timeout is 300 seconds.
Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoints actually return. The endpoint names and categories are listed on the homepage, but the actual functionality behind `/api/v1/transfers/116` specifically is unclear — it does not match any of the named endpoints on the landing page. Treat this listing with caution until more documentation is available.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management
- —Fetching real-time financial data or crypto gas estimates with per-call payment
- —Geocoding or data validation as a utility service paid in USDC on Base
- —Exporting data or generating analytics reports on a pay-as-you-go basis
Fit
Best for
- —Developers or agents who want keyless, pay-per-use API access
- —x402-compatible agents settling micropayments in USDC on Base
- —Prototyping or low-volume use cases where $0.02/request is cost-effective
Not for
- —High-volume production workloads where per-request pricing adds up quickly
- —Users who need detailed API documentation, SLAs, or guaranteed uptime
- —Anyone without USDC on Base or an x402-compatible payment client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/116 \
-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 beyond the landing page catalog. There is no OpenAPI spec, no request/response examples, and the specific endpoint path '/api/v1/transfers/116' does not correspond to any named endpoint on the homepage. The actual functionality is unclear.
Warnings
- —The endpoint path /api/v1/transfers/116 does not match any of the named endpoints listed on the homepage — its actual functionality is unknown.
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, no request/response schema, and no usage examples are available.
- —The platform's actual service delivery behind these endpoints is unverified — proceed with caution.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/transfers/116 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/transfers/116
- —Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompt with no additional content.https://lowpaymentfee.com/docs