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 & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/stripe/invoices/68` 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 uniform $0.02/request pricing across all endpoints with no API keys, no rate limits, no minimums, and instant access.
Documentation 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 description of what this particular invoice endpoint actually returns or what input it expects. The endpoint accepts POST requests and returns application/json according to the x402 challenge metadata. Without further documentation it is unclear what payload to send or what the response contains.
Capabilities
Use cases
- —Programmatically retrieving or interacting with Stripe invoice data via a pay-per-call model
- —Agents that need to access financial/invoice endpoints without managing API keys
- —Demonstrating x402 protocol payment flows on Base with USDC
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base automatically
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —Production workloads requiring well-documented, stable API contracts
- —Users who need detailed request/response schemas before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/68
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment proof on Base to access.Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The purpose of this specific invoice endpoint is unclear, making this effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; it is unknown what POST body to send or what the response contains.
- —The specific purpose of /api/v1/stripe/invoices/68 is not explained anywhere in the crawled material.
- —The platform lists many endpoints but none have documented schemas or usage examples.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/68
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/68
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs