x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-protocol API platform that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/192` is listed as "Premium API Access" and accepts payment via the x402 exact scheme. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.
The provider's landing page 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the /docs, /api, /pricing, 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 detailed documentation available from the crawl. The specific functionality behind the `/api/v1/charges/192` path is unclear; it may be a generic charge endpoint or map to one of the listed services. Without documentation or example payloads, the actual behavior of this endpoint cannot be confirmed beyond the x402 challenge metadata.
Capabilities
Use cases
- —Paying per-request for API access without needing API keys or subscriptions
- —Programmatic agent-driven API consumption with on-chain USDC micropayments
- —Accessing data, AI inference, finance, or utility endpoints via x402 protocol
Fit
Best for
- —Developers wanting zero-commitment pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost micropayment-gated endpoints
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-throughput use cases where $0.02/request adds up significantly
- —Anyone without a Base-compatible USDC wallet
Quick start
# The endpoint returns 402 with an x402 challenge.
# Supply an X-PAYMENT header with a valid x402 payment proof.
curl -X POST https://lowpaymentfee.com/api/v1/charges/192 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The specific functionality of /api/v1/charges/192 is undocumented.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition found
- —The specific purpose of /api/v1/charges/192 ('Premium API Access') is not explained anywhere
- —No request or response examples available
- —Cannot verify what data or service this endpoint actually returns
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/charges/192
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com