x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 181) behind an x402 payment wall. The endpoint accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). Each call costs up to $0.02 (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider's landing page advertises a broad suite of APIs spanning data & analytics, AI & ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced at $0.02 per request. However, the specific endpoint listed here targets a Stripe invoices resource, and no documentation was found explaining the request body schema, expected input parameters, or response format for this particular route. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Because the endpoint returned a well-formed 402 challenge with x402 version 1, it is confirmed live and operational. The payment is routed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base mainnet. The response MIME type is application/json. Without further documentation or example responses, the exact functionality behind this invoice endpoint remains unclear.
Capabilities
Use cases
- —Retrieving or interacting with Stripe invoice data via a crypto-settled paywall
- —Programmatic access to invoice information without traditional API key management
- —Agent-driven payment flows where per-call USDC settlement replaces subscription billing
Fit
Best for
- —Developers wanting keyless, pay-per-use access to invoice data
- —AI agents that can settle x402 payments on Base in USDC
- —Projects needing low-friction API access without signup or rate limits
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume batch invoice processing where per-call fees add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/181 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is no documentation, no request/response schema, and no explanation of what the Stripe invoices endpoint actually returns. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all return only a wallet-connect prompt with no content.
- —No request body schema or response schema documented for this endpoint.
- —The specific purpose of the /stripe/invoices/181 route is unclear — it may be a demo or placeholder.
- —The broader site advertises many API categories (AI, analytics, finance, utilities) but none have discoverable documentation.
Citations
- —Endpoint returns a valid x402 version 1 challenge with 402 status on POSThttps://lowpaymentfee.com/api/v1/stripe/invoices/181
- —USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with maxAmountRequired of 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/stripe/invoices/181
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages contain only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs