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 micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/137` 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 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address, and the endpoint returns its response as application/json.
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.
However, the specific functionality behind the `/api/v1/stripe/charges/137` endpoint is unclear — it does not map to any of the documented API categories, and its name suggests it may relate to Stripe charge data or a payment-related resource. Documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.
Capabilities
Use cases
- —Paying per-call for API access without managing API keys or subscriptions
- —Programmatic agent access to gated endpoints via x402 micropayments
- —Testing x402 payment flows on the Base network
Fit
Best for
- —Developers or agents wanting keyless, pay-per-use API access
- —x402-compatible wallets and agents on the Base network
- —Low-volume or sporadic API consumers who prefer no commitments
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/137 \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/stripe/charges/137 is unclear. All doc pages returned only 'Connect wallet' with no content. The listing is effectively a stub.
Warnings
- —The specific endpoint /api/v1/stripe/charges/137 does not correspond to any documented API category on the site — its actual functionality is unknown.
- —All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.
- —No request or response schema is available; callers cannot know what to send or what to expect back.
- —The endpoint path includes 'stripe/charges' which may indicate interaction with Stripe payment data — potential regulatory or compliance considerations.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/137
- —All APIs are listed at $0.02/request with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com