x402-gated Stripe invoice endpoint on Base, paying $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides premium API access to a Stripe invoice resource (invoice ID 188) via the x402 payment protocol. It is settled on the Base network using USDC (contract 0x8335…2913) with a per-request cost of $0.02 (20,000 base units at 6 decimals). The endpoint accepts POST requests and returns application/json responses.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access.
However, the specific endpoint being listed here (/api/v1/stripe/invoices/188) does not appear in the platform's published API catalog. Its purpose — accessing a particular Stripe invoice — is unclear: it may return invoice details, trigger an invoice action, or serve as a demo endpoint. No request body schema, response schema, or documentation beyond the x402 challenge is available. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Retrieving or interacting with a specific Stripe invoice via a crypto-settled paywall
- —Demonstrating x402 payment protocol integration with USDC on Base
- —Agent-driven invoice access without API keys or subscriptions
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring keyless, pay-per-request invoice access
Not for
- —Production Stripe invoice management (no documented schema or guarantees)
- —Users who need detailed API documentation or OpenAPI specs
- —Non-crypto payment flows — requires USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/188 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no request/response schema, no documentation, and the specific invoice endpoint is not listed in the platform's own catalog. Docs pages returned only wallet-connect prompts with no content.
Warnings
- —Endpoint /api/v1/stripe/invoices/188 is not listed in the platform's own API catalog — purpose is unclear
- —No request body schema or response schema available
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content
- —No OpenAPI spec or ai-plugin manifest found
- —The endpoint references a specific Stripe invoice ID (188) which may be ephemeral or a demo resource
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base network, equaling $0.02https://lowpaymentfee.com/api/v1/stripe/invoices/188
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/188
- —The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com