Premium API access via x402 payment on Base network, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" gated behind an x402 payment challenge. The site hosts a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and instant access.
The specific endpoint `/api/v1/stripe/subscriptions/146` is labeled "Premium API Access" in the x402 challenge. Its exact functionality beyond the generic label is unclear from available documentation — the site's docs, pricing, and API pages all require wallet connection and provide no further detail. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network.
The endpoint accepts POST requests and returns `application/json`. No input or output schema details are documented beyond the x402 challenge metadata. The site advertises no API keys required, no rate limits, and a simple pay-per-use model at $0.02 per request across all listed endpoints.
Capabilities
Use cases
- —Accessing premium API features without traditional API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Integrating pay-per-use endpoints into agent workflows without subscriptions
Fit
Best for
- —Developers wanting instant API access without signup
- —Agents that can settle x402 payments in USDC on Base
- —Use cases requiring no rate limits and no commitments
Not for
- —Users who need detailed API documentation before purchasing
- —Applications requiring non-crypto payment methods
- —Developers needing well-documented input/output schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/146 \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of what this specific endpoint actually does, no input/output schema, no examples, and the docs pages all just show 'Connect wallet' with no content. The 'Premium API Access' label is generic and uninformative.
Warnings
- —No documentation available — all doc pages require wallet connection and show no content
- —The specific functionality of /api/v1/stripe/subscriptions/146 is unknown beyond the label 'Premium API Access'
- —No input or output schema documented
- —The endpoint path references 'stripe/subscriptions' which is unusual for an x402-gated endpoint — purpose unclear
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/146
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/146