x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides x402-protocol access to a Stripe invoice resource (invoice #136). It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated behind x402 payment challenges on the Base network using USDC.
The specific endpoint `/api/v1/stripe/invoices/136` is labeled "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through on-chain micropayment.
Documentation on the site is extremely thin — 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 outputSchema stub, and no explanation of what data the invoice endpoint actually returns. The platform lists many other endpoints (analytics, AI, finance, utils) at the same $0.02 price point, but none have documented schemas or example payloads available from the crawl.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single micropayment without needing an API key
- —Agent-driven invoice lookup where payment is settled on-chain per request
- —Programmatic access to invoice #136 details for automated accounting workflows
Fit
Best for
- —Developers wanting keyless, pay-per-use access to invoice data
- —AI agents that can settle x402 payments on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Bulk invoice retrieval or batch processing (no documented batch endpoints)
- —Users who need detailed API documentation or response schemas before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/136 \
-H "X-PAYMENT: <x402-payment-token>" \
-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/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of 'Premium API Access' for a specific Stripe invoice ID is unclear. This is effectively a stub listing.
Warnings
- —No OpenAPI or request/response schema available — actual response format is unknown
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The endpoint targets a specific invoice ID (136); it is unclear whether this is a demo or a real resource
- —No description of what 'Premium API Access' actually returns
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/stripe/invoices/136
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/136