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 ID 162) behind an x402 paywall. The provider operates a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per call and settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/invoices/162` is labeled "Premium API Access" in the x402 challenge. It accepts POST requests and returns `application/json`. Payment is made via the x402 exact scheme: the caller includes an X-PAYMENT header containing a signed USDC transfer of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the provider's address on Base. No API keys or rate limits are advertised; access is purely payment-gated.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no description of what the invoice endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data or functionality is delivered after payment.
Capabilities
Use cases
- —Retrieving Stripe invoice data (invoice 162) via a single paid API call
- —Demonstrating x402 payment-gated API access on Base
- —Integrating pay-per-request invoice lookups into agent workflows
Fit
Best for
- —Developers experimenting with x402 payment protocols
- —Agents that need on-demand invoice data without API key management
- —Users who prefer per-call USDC micropayments over subscriptions
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —Bulk invoice retrieval across many invoice IDs (only invoice 162 is exposed at this path)
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/162 \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality behind the payment wall is unknown.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided; impossible to know what the endpoint returns after payment
- —The endpoint path references a specific Stripe invoice ID (162); unclear if other IDs are supported
- —No examples of successful responses available
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/162
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/162
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs