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 ID 142). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utility categories — all gated behind x402 payment challenges on the Base network using USDC.
The specific endpoint `/api/v1/stripe/invoices/142` 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 sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. The response MIME type is application/json.
The platform advertises a flat $0.02/request pricing model with no API keys, no rate limits, no minimums, and instant access. Documentation pages (/docs, /pricing, /api, /README) all resolve but contain only a "Connect wallet" prompt, so detailed request/response schemas and usage documentation are unavailable. The exact data returned by this particular invoice endpoint is unclear — it may return Stripe invoice details or serve as a proxy for Stripe billing operations, but this is speculative given the sparse documentation.
Capabilities
Use cases
- —Retrieving or interacting with Stripe invoice data via a crypto-payment-gated endpoint
- —Demonstrating x402 protocol integration for pay-per-request billing
- —Programmatic invoice access without traditional API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base network
- —Use cases needing keyless, pay-as-you-go API access
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —Production workflows requiring guaranteed SLAs or support
- —Users without access to USDC on the Base network
Quick start
# 1. Send a POST to the endpoint — you'll get a 402 with payment challenge
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/142
# 2. Parse the 402 response, construct an X-PAYMENT header with a valid
# USDC payment proof on Base, then retry:
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/142 \
-H "X-PAYMENT: <signed-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of this specific invoice endpoint is ambiguous.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'
- —No request body schema or response schema documented for this endpoint
- —The specific function of /api/v1/stripe/invoices/142 is unclear — it may be a demo or placeholder
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/142
- —Platform advertises $0.02/request flat pricing with no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) resolve but contain only 'Connect wallet'https://lowpaymentfee.com/docs