Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.
The specific endpoint at `/api/v1/messages/75` is described as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via an `X-PAYMENT` header, with a 300-second timeout window. The output schema indicates a standard HTTP POST interface.
Documentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the `/api/v1/messages/75` path is unclear; it does not map to any of the named endpoints listed on the homepage. Agents should treat this as a live but under-documented endpoint.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys
- —Fetching real-time financial data such as token quotes, gas estimates, and exchange rates
- —Running data analytics queries (metrics, reports, insights) with micro-payments
- —Geocoding and data validation via utility endpoints
Fit
Best for
- —Agents or developers who want instant, keyless API access with crypto micropayments
- —Low-volume or bursty workloads where per-request pricing avoids subscription overhead
- —Web3-native applications already operating on the Base network with USDC
Not for
- —High-volume production workloads that need SLA guarantees and detailed documentation
- —Users without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/75 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no usage examples, and the specific /api/v1/messages/75 path is not documented on the homepage. The /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. Effectively a stub listing.
Warnings
- —The endpoint path /api/v1/messages/75 does not correspond to any named endpoint on the homepage catalog — its actual functionality is unknown.
- —No OpenAPI spec, request schema, or response schema is available.
- —Documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no useful content.
- —No examples of request or response payloads could be found.
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/messages/75 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.https://lowpaymentfee.com/api/v1/messages/75
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com