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 that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/stripe/invoices/131` appears to be a Stripe invoice-related resource. 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). The platform advertises flat $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access. Payment is made via the x402 exact scheme, settling on the Base L2 network.
Documentation on the site 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 schema, no request/response examples, and no detailed description of what this particular invoice endpoint returns or expects as input. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to determine the exact functionality or expected POST body.
Capabilities
Use cases
- —Retrieving or interacting with Stripe invoice data via a pay-per-request model
- —Programmatic access to invoice information without API key management
- —Agent-driven invoice lookups settled with USDC on Base
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume invoice processing where $0.02/request adds up significantly
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/131 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label 'Premium API Access'. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The specific functionality of /api/v1/stripe/invoices/131 is unclear — it may expose Stripe invoice data but no details are provided
- —No request body schema or response examples available
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/131
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/131