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 provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/73` is listed as "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.
The platform advertises four 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 listed endpoints share the same $0.02/request pricing.
The specific functionality behind the `/api/v1/keys/73` endpoint is unclear from available documentation. The description "Premium API Access" and the path segment `/keys/73` suggest it may be an API key provisioning or access-granting endpoint rather than a data endpoint, but no schema, request/response examples, or detailed documentation were found. The site's non-root pages (pricing, README, API docs) all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Accessing data analytics and reporting endpoints without subscription commitments
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
- —Fetching real-time financial data such as token prices, exchange rates, and gas estimates
- —Using utility services like geocoding, validation, and data conversion with instant pay-per-use billing
Fit
Best for
- —Agents or developers who want zero-commitment, pay-as-you-go API access
- —Use cases requiring low-cost micropayments per API call ($0.02)
- —Crypto-native workflows already operating on the Base network with USDC
Not for
- —High-volume use cases where per-request pricing may add up compared to flat-rate plans
- —Users who need detailed API documentation, schemas, or SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/keys/73 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/keys/73 is ambiguous. Non-root pages returned no useful content. Effectively a stub listing.
Warnings
- —No API documentation, OpenAPI spec, or request/response schema available
- —The specific functionality of /api/v1/keys/73 ('Premium API Access') is unclear — it may be a key provisioning endpoint rather than a data API
- —All documentation pages (pricing, README, API) returned only 'Connect wallet' with no content
- —No examples of successful responses are available to verify endpoint behavior
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/keys/73
- —All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com