x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment challenge. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all settled on the Base network using USDC via the x402 protocol.
The specific resource `/api/v1/stripe/invoices/109` appears to be a Stripe invoice-related endpoint. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments required. Payment is made via the x402 `exact` scheme, settling on-chain on Base.
Documentation beyond the landing page 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 documentation, and no examples available. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual functionality behind the paywall is unclear beyond the generic "Premium API Access" label and the Stripe invoices path segment.
Capabilities
Use cases
- —Programmatically accessing Stripe invoice data via a pay-per-request model
- —Agent-driven invoice retrieval without API key management
- —On-chain micropayment-gated access to financial data
Fit
Best for
- —Agents that need one-off invoice lookups without subscription overhead
- —Developers exploring x402 payment-gated APIs on Base
- —Use cases where no-API-key, instant access is preferred
Not for
- —High-volume invoice processing where $0.02/request adds up significantly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/109 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"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 documentation, no request/response examples, and the actual functionality behind the paywall is undocumented. The docs pages are empty stubs. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition found; request and response formats are unknown
- —The specific purpose of /api/v1/stripe/invoices/109 is unclear — it may be a demo or placeholder endpoint
- —No agents.txt or robots.txt present
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/109
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/109