x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice #183) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/invoices/183` is labeled "Premium API Access" and accepts HTTP POST requests. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment parameters (asset, amount, payTo address) and must attach a valid X-PAYMENT header to complete the transaction. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is gated purely by micropayment.
The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the invoice endpoint actually returns. The exact purpose of retrieving "Stripe invoice 183" is unclear from available materials.
Capabilities
Use cases
- —Programmatically retrieving a Stripe invoice record via micropayment
- —Agent-driven invoice lookup without traditional API key authentication
- —Demonstrating x402 protocol payment flows for invoice data
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need one-off invoice data without subscription commitments
- —Testing micropayment-gated API integrations on Base
Not for
- —Bulk invoice processing requiring thousands of calls (no documented batch endpoint)
- —Users needing detailed API documentation or response schema guarantees
- —Production systems requiring SLA or uptime commitments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/183 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the purpose of this specific invoice endpoint is unclear. The docs, pricing, and README pages are all empty stubs.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —The /docs, /pricing, /api, and /README pages contain no useful content (only 'Connect wallet')
- —The specific purpose of '/api/v1/stripe/invoices/183' is unclear — it may be a demo or placeholder
- —No examples of request body or response body are available anywhere in crawled material
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/183
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/183