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 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/34` is listed as "Premium API Access" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). The x402 challenge was successfully captured, confirming the endpoint is live.
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 $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 for what this specific endpoint returns or what input it expects. The endpoint path (`/stripe/charges/34`) suggests it may relate to Stripe charge creation or retrieval, but this is speculative given the lack of documentation.
Capabilities
Use cases
- —Accessing premium API endpoints without traditional API key registration
- —Making one-off API calls with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
Fit
Best for
- —Developers who want instant API access without signup or API keys
- —AI agents that can settle x402 payments autonomously on Base
- —Users comfortable with on-chain USDC micropayments for low-cost API calls
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring high-volume calls where per-request crypto settlement adds latency
- —Developers without a Base-compatible wallet or USDC holdings
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/34 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live 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 purpose of this endpoint (/stripe/charges/34) is unclear.
Warnings
- —No OpenAPI schema or detailed documentation available for any endpoint
- —All doc/pricing/README pages render only 'Connect wallet' with no content
- —The specific function of /api/v1/stripe/charges/34 ('Premium API Access') is undocumented — the path suggests Stripe charge operations but this is unconfirmed
- —No request body schema or response examples are available
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/34
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/34