x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com exposes a specific Stripe invoice resource (`/api/v1/stripe/invoices/144`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The endpoint accepts HTTP POST and returns `application/json`.
The price per request is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" scheme with a 300-second timeout. The provider's landing page advertises a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance, and utility services — all at the same $0.02/request price point with no API keys, no rate limits, and no commitments.
However, this particular endpoint (`/stripe/invoices/144`) is not listed among the advertised APIs on the homepage. Its actual response payload is unknown — the title "Premium API Access" and the Stripe-invoice-style path suggest it may return invoice data or serve as a payment/billing resource, but no documentation, schema, or example responses are available. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Retrieving Stripe invoice data (invoice #144) via a single micropayment
- —Programmatic access to invoice details without traditional API key management
- —Agent-driven payment and data retrieval in a single HTTP round-trip
Fit
Best for
- —Agents or services that need to fetch specific invoice data on-demand
- —Developers exploring x402 payment-gated API patterns on Base
- —Use cases where keyless, pay-per-call access is preferred over subscriptions
Not for
- —Bulk invoice retrieval or batch processing (single-resource endpoint)
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Non-crypto workflows that cannot settle USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/144 \
-H "X-PAYMENT: <x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a well-formed x402 challenge, but there is zero documentation on what the endpoint actually returns, no OpenAPI schema, no example responses, and the docs/pricing/README pages are empty. The specific invoice endpoint is not even listed among the provider's advertised APIs, making its purpose unclear.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —This specific endpoint (/api/v1/stripe/invoices/144) is not listed among the provider's advertised API catalog on the homepage.
- —Response schema and payload structure are completely unknown.
- —No OpenAPI spec or machine-readable schema is published.
- —The purpose and contents of 'invoice 144' are opaque — could be test data or a placeholder.
Citations
- —The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base network with exact schemehttps://lowpaymentfee.com/api/v1/stripe/invoices/144
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/144
- —Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The homepage lists APIs in categories: Data & Analytics, AI & ML, Finance & Web3, and Infrastructure — but does not list /stripe/invoices/144https://lowpaymentfee.com