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 wall. 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 settled on the Base network using USDC.
The specific endpoint `/api/v1/stripe/invoices/185` appears to be a Stripe invoice-related resource. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of up to 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 window.
The platform advertises a uniform $0.02/request pricing model across all its endpoints, with no API keys, no rate limits, no minimums, and instant access. Documentation pages (/docs, /pricing, /api, /README) all appear to require wallet connection and returned no substantive content during the crawl, so the actual behavior and response format of this specific invoice endpoint remain unclear. There is no OpenAPI schema, no example request/response documentation, and no detailed description of what data this endpoint returns or what input it expects beyond a 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/185 \
-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 schema, no documentation of request/response formats, no examples, and all doc pages require wallet connection with no crawlable content. The purpose of this specific invoice endpoint is unclear beyond its title.
Warnings
- —No OpenAPI or schema documentation available — request/response format is unknown
- —All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content
- —The specific purpose and expected input/output of /api/v1/stripe/invoices/185 is not documented
- —The endpoint path references a specific invoice ID (185), which may be a demo or placeholder resource
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/185
- —The platform advertises $0.02/request pricing 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/185