x402-gated premium API endpoint on Base, payable in USDC at $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. 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 share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/charges/13` accepts POST requests and returns JSON. Its exact functionality is not documented beyond the label "Premium API Access" — it sits under a `/stripe/charges/` path, which suggests it may relate to Stripe charge data or payment processing, but no detailed schema or documentation is available. The platform advertises no API keys, no rate limits, and instant access; payment is handled entirely via the x402 protocol with an on-chain USDC transfer.
The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment timeout is 300 seconds. No OpenAPI spec, detailed docs, or example responses were found during crawling — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without traditional API key registration
- —Agent-driven workflows that need to pay per request using on-chain USDC
- —Exploring x402 protocol integrations for pay-as-you-go services
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —AI agents that can autonomously pay for API calls with USDC
- —Users who want keyless, instant API access without subscriptions
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —Applications requiring high-throughput with predictable flat-rate pricing
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/13 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation, no example requests or responses, and the exact functionality behind "Premium API Access" is unclear. The docs/pricing/API pages are all empty beyond a wallet connect prompt.
Warnings
- —No documentation available — docs, pricing, and API pages render only 'Connect wallet' with no content
- —Exact functionality of /api/v1/stripe/charges/13 is unknown; 'Premium API Access' is the only description
- —No OpenAPI schema, no example request/response bodies, no input/output field definitions
- —The platform appears to be a demonstration or early-stage project with many listed endpoints but no substantive docs
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (i.e., $0.02)https://lowpaymentfee.com/api/v1/stripe/charges/13
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/13
- —Docs, pricing, and API pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs