x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.
What it does
lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/33` is listed as "Premium API Access" and requires up to $0.02 in USDC (maxAmountRequired of 20,000 base units with 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions are needed.
The broader 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 endpoints are listed at the same $0.02/request price point and settle payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual behavior and response format of this specific endpoint remain unknown.
Capabilities
Use cases
- —Agents that need on-demand API access without managing API keys or subscriptions
- —Micropayment-gated data retrieval for analytics, finance, or AI tasks
- —Programmatic access to utility services like geocoding or data conversion with crypto settlement
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-call API access
- —x402-compatible wallets and agent frameworks on Base
- —Low-volume or bursty workloads where subscription pricing is wasteful
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads requiring predictable fiat billing
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/33 \
-H "Content-Type: application/json"
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.Endpoint
Quality
The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific 'Premium API Access' endpoint is undocumented. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all return only a 'Connect wallet' prompt with no content.
- —No OpenAPI or JSON schema describing request parameters or response format for this endpoint.
- —The purpose of '/api/v1/stripe/charges/33' is unclear — the name suggests Stripe charge creation but no details are provided.
- —Cannot verify what data or service this endpoint actually returns upon successful payment.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/33
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/stripe/charges/33
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com