x402-gated Stripe invoice endpoint on Base, paying with USDC per request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. The specific resource `/api/v1/stripe/invoices/165` appears to be a Stripe invoice-related endpoint, though the exact functionality is not documented beyond the generic label. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme.
The endpoint charges a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site-wide pricing of $0.02/request advertised on the landing page. The provider advertises no API keys, no rate limits, and instant access. The x402 challenge specifies a POST method with a 300-second timeout.
The broader lowpaymentfee.com platform offers a catalog of x402-gated APIs spanning data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. However, documentation pages beyond the landing page returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response format of this specific invoice endpoint remain unclear.
Capabilities
Use cases
- —Retrieving or interacting with Stripe invoice data via a crypto-paid API call
- —Programmatic access to invoice information without traditional API key provisioning
- —Agent-driven invoice lookups settled in USDC on Base
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments in USDC on Base
- —Prototyping integrations without signup or subscription commitments
Not for
- —Users needing detailed API documentation or response schemas 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/165 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of request/response schemas, no OpenAPI spec, and all doc pages return only 'Connect wallet' with no content. The specific purpose of '/api/v1/stripe/invoices/165' is undocumented beyond the generic 'Premium API Access' label.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet'
- —No request or response schema provided; actual endpoint behavior is unknown
- —The endpoint path references a specific invoice ID (165), which may be a static resource rather than a general-purpose API
- —The 'Premium API Access' description is generic and does not explain what this endpoint actually returns
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/165
- —Site-wide pricing is $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/165