x402-gated Stripe invoice endpoint on Base, paying with USDC per request.
What it does
This endpoint at lowpaymentfee.com provides access to a specific Stripe invoice resource (invoice #197) behind an x402 paywall. The endpoint accepts POST requests and is settled on the Base network using USDC (USD Coin) at the contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The maximum amount required per call is 20,000 base units of USDC, which with 6 decimals equals $0.02 per request.
The hosting site lowpaymentfee.com offers a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced 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/197.
Documentation is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live via a valid x402 402 challenge response, but the actual behavior and response format of the invoice endpoint remain undocumented.
Capabilities
Use cases
- —Retrieving or interacting with a specific Stripe invoice via a crypto-settled paywall
- —Programmatic invoice access without traditional API key management
- —Agent-driven payment and invoice retrieval workflows
Fit
Best for
- —Developers wanting keyless, pay-per-call access to Stripe invoice data
- —AI agents that can settle x402 payments on Base with USDC
- —Prototyping crypto-gated API payment flows
Not for
- —Users needing detailed API documentation or response schema guarantees
- —Bulk invoice processing requiring high throughput with predictable SLAs
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/197 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but there is zero documentation on request parameters, response schema, or what the Stripe invoice endpoint actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The specific purpose of this invoice endpoint (id 197) is unclear.
Warnings
- —No OpenAPI spec or request/response schema available
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The endpoint references a specific invoice ID (197) — unclear if this is a demo or a real resource
- —No examples of successful responses are available to verify functionality
- —The broader site lists many API categories but none match this specific Stripe invoices path
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/197
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/197
- —The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Documentation pages render only a Connect wallet prompt with no technical contenthttps://lowpaymentfee.com/docs