x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment challenge. The specific resource path (`/api/v1/stripe/invoices/133`) suggests it returns or processes a Stripe invoice identified by ID 133. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-scheme challenge requiring up to 0.02 USDC per request (20,000 base units at 6 decimals). The endpoint accepts HTTP POST and returns application/json.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific listing is for the Stripe invoices endpoint only. Documentation on the site is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail.
Because there is no OpenAPI schema, no request/response examples, and no documentation explaining what this invoice endpoint actually returns or what input it expects, the practical utility for an agent is limited. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation means callers must discover behavior empirically.
Capabilities
Use cases
- —Fetching or processing a specific Stripe invoice via a crypto-gated API call
- —Demonstrating x402 payment protocol integration with Stripe billing data
- —Programmatic invoice access without traditional API keys
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call access to invoice data
- —Projects already settled on Base network USDC
Not for
- —Production invoice management requiring documented, stable schemas
- —Users who need detailed API documentation before integrating
- —Bulk invoice processing at scale (no documented batch support)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/133 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works. However, there is zero documentation on request format, response schema, or what the invoice endpoint actually does. No OpenAPI spec, no examples, and all doc pages render only 'Connect wallet'. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided for this endpoint
- —The specific purpose of /api/v1/stripe/invoices/133 is unclear — it may be a demo or placeholder
- —No information on what POST body (if any) is expected
Citations
- —The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network using USDC at asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/133
- —maxAmountRequired is 20000 base units (0.02 USDC at 6 decimals)https://lowpaymentfee.com/api/v1/stripe/invoices/133
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com