x402-gated Stripe invoice endpoint on Base, payable in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/33` appears to be a Stripe invoice-related endpoint, though the exact response payload is undocumented. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme.
The endpoint is live and returns a valid x402 challenge (version 1) when called via POST without payment. The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request. The provider's landing page confirms a flat $0.02/request pricing model across all their API offerings, with no API keys, no rate limits, and instant access advertised.
The provider hosts a broader suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). However, this specific listing covers only the `/api/v1/stripe/invoices/33` endpoint. Documentation beyond the landing page is effectively empty (all doc/pricing/API pages just show "Connect wallet"), so the exact request format and response schema for this endpoint remain unknown.
Capabilities
Use cases
- —Programmatically accessing Stripe invoice data via a pay-per-request model without API keys
- —Agent-driven invoice retrieval settled in USDC on Base
- —Integrating invoice lookups into workflows that use x402-compatible payment clients
Fit
Best for
- —Developers wanting keyless, pay-per-use access to invoice data
- —AI agents with x402 payment capability on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or response schema before integrating
- —High-volume invoice processing where $0.02/request adds up significantly
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/33 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and no explanation of what the endpoint actually returns. The docs, pricing, and API pages are all blank beyond a wallet-connect prompt. The purpose of 'Stripe invoices/33' is unclear.
Warnings
- —No API documentation available — all doc pages show only 'Connect wallet'
- —No request body schema or response schema documented for this endpoint
- —The endpoint path '/api/v1/stripe/invoices/33' references a specific invoice ID (33), which may be a demo or placeholder rather than a general-purpose endpoint
- —The broader site lists many API categories but none match this specific Stripe invoices path
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/33
- —Flat $0.02/request pricing, no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/33