x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 45) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.
The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and utility services (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific listing is for the Stripe invoices endpoint at path /api/v1/stripe/invoices/45, which is not among the endpoints documented on the landing page.
Because the endpoint is not described in the site's public documentation and the crawled docs/pricing/API pages returned only a "Connect wallet" prompt with no further content, the actual behavior and response schema of this particular endpoint remain unclear. The x402 challenge was successfully captured (HTTP 402), confirming the endpoint is live and accepting payment-gated requests.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a crypto-settled micropayment
- —Programmatic access to invoice #45 without traditional API keys
- —Agent-driven invoice lookup with on-chain USDC payment on Base
Fit
Best for
- —Developers who want keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments in USDC on Base
- —Users exploring x402 protocol integrations with Stripe billing
Not for
- —Users needing bulk invoice management or batch operations
- —Anyone requiring detailed API documentation or response schemas before integrating
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/45
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment proof on Base to access.Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but this specific endpoint (/api/v1/stripe/invoices/45) is not documented anywhere on the site. Crawled pages beyond the landing page returned only 'Connect wallet' with no usable content. No OpenAPI spec, no response schema, and no description of what the endpoint actually returns.
Warnings
- —This specific endpoint path (/api/v1/stripe/invoices/45) is not listed among the documented APIs on the provider's landing page.
- —Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.
- —No response schema or example responses are available; actual endpoint behavior is unknown.
- —The endpoint name 'Premium API Access' is generic and does not describe the resource.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/45
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/45
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com