x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is part of a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all gated behind x402 micro-payments settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/subscriptions/141` is listed as "Premium API Access" and returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0.02 USD) per call. The asset address `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` corresponds to USDC on Base. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a timeout of 300 seconds.
The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, no minimums, and instant access. However, the actual functionality behind this particular "Premium API Access" endpoint is unclear — the endpoint path suggests a Stripe subscription resource, but no documentation, request/response schemas, or examples are available. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. Without knowing what data or service this endpoint returns upon successful payment, agents should treat this as a stub listing until more documentation surfaces.
Capabilities
Use cases
- —Paying per-call for premium API resources without traditional API keys
- —Integrating x402 micro-payment gated endpoints into agent workflows
- —Accessing premium data or services via USDC on Base
Fit
Best for
- —Agents or developers wanting keyless, pay-per-use API access
- —x402-compatible wallets and clients on the Base network
- —Micro-payment experimentation with USDC
Not for
- —Users who need detailed API documentation or response schemas before purchasing
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where $0.02/request adds up without clear value proposition
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/141 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and no explanation of what the endpoint actually returns upon successful payment. The docs and pricing pages are empty beyond a wallet-connect prompt. This is effectively a stub.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No request or response schema provided; unclear what data or service is delivered after payment
- —Endpoint path '/api/v1/stripe/subscriptions/141' suggests a Stripe subscription resource but no details are given
- —No OpenAPI spec, no ai-plugin manifest, no agents.txt found
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/141
- —The platform advertises $0.02/request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/141
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs