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 one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are pay-per-request with no API keys, no rate limits, and settlement on the Base network using USDC.
The specific endpoint `/api/v1/stripe/subscriptions/140` is labeled "Premium API Access" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). It accepts POST requests and returns application/json. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payment via the "exact" scheme on Base mainnet, paying to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
However, the actual functionality behind this specific endpoint is unclear. The URL path suggests it relates to Stripe subscriptions, but the platform's landing page does not list or describe this particular endpoint. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive documentation. Without further documentation, the exact input parameters and response schema for this endpoint remain unknown.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic access to subscription-related data or actions
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users needing detailed API documentation before integrating
- —Applications requiring free or fiat-only payment methods
- —High-volume use cases where per-request pricing may not be optimal
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/140 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation, no input/output schema, and no description of what this endpoint actually does beyond the generic label "Premium API Access". The docs pages are all behind a wallet-connect gate with no public content.
Warnings
- —No documentation available — all doc pages return only 'Connect wallet' with no content
- —The exact functionality of /api/v1/stripe/subscriptions/140 is unknown; the URL path suggests Stripe subscription management but this is unconfirmed
- —No input parameters or response schema documented
- —This endpoint is not listed on the platform's public landing page among the advertised APIs
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/140
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/140
- —Docs, API, pricing, and README pages all show only 'Connect wallet' with no public documentationhttps://lowpaymentfee.com/docs