x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request.
The hosting site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, 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 instant access via the Base network.
However, this specific endpoint path (`/api/v1/stripe/subscriptions/55`) suggests a subscription-related resource rather than one of the catalog APIs listed on the homepage. There is no documentation explaining what this particular endpoint returns or what input it expects beyond a POST request. The docs, pricing, and API pages on the site are essentially empty (showing only a "Connect wallet" prompt), so the actual behavior of this endpoint is unknown. Treat this listing as a stub until more documentation or schema information becomes available.
Capabilities
Use cases
- —Paying per-call for API access without traditional API keys or subscriptions
- —Agent-driven programmatic access to premium resources via x402 protocol
- —Accessing subscription-related data on the Base network with USDC micropayments
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —Users needing detailed API documentation or schemas before integrating
- —Production workloads requiring SLA guarantees or support
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/55
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to access.Example
Response
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what it actually does, no input/output schema, and the site's docs pages are empty. The endpoint path suggests a subscription resource but nothing confirms its behavior.
Warnings
- —No documentation available — docs, pricing, and API pages all render only a wallet-connect prompt.
- —Endpoint path '/api/v1/stripe/subscriptions/55' does not match any of the advertised catalog APIs on the homepage.
- —No input or output schema provided; actual response payload after payment is unknown.
- —The 'stripe/subscriptions' path naming is unusual for an x402-settled endpoint — purpose is unclear.
Citations
- —The endpoint returns a 402 challenge requiring USDC on Base with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/stripe/subscriptions/55
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/stripe/subscriptions/55
- —Docs, pricing, and API pages show only a 'Connect wallet' prompt with no further content.https://lowpaymentfee.com/docs