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 `/api/v1/keys/92` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required. Callers attach an X-PAYMENT header to each request and are charged per use.
The wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing.
The specific functionality behind `/api/v1/keys/92` is not documented beyond the label "Premium API Access." There is no OpenAPI spec, no request/response schema, and the crawled docs pages (pricing, README, /api) all resolve to a wallet-connect prompt with no additional content. Prospective users should be aware that the actual behavior of this endpoint is unclear from available documentation.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic access to data, AI, finance, or utility endpoints without subscriptions
Fit
Best for
- —Developers who want zero-commitment, pay-per-use API access
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto-native (USDC on Base) billing over traditional API keys
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
- —Anyone without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/keys/92 \
-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 OpenAPI spec, no request/response schema, no documentation of what the endpoint actually returns, and the crawled pages beyond the homepage are empty wallet-connect prompts. The specific purpose of /api/v1/keys/92 is unknown beyond its label.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The actual functionality of /api/v1/keys/92 ('Premium API Access') is undocumented — it is unclear what data or service it provides
- —Crawled /pricing, /README, and /api pages contain no useful content (only 'Connect wallet' prompts)
- —No example requests or responses are available
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/keys/92
- —All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/keys/92