x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/85`) behind an x402 payment challenge. It is part of a broader platform that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 protocol on the Base network using USDC.
The specific endpoint listed here is labeled "Premium API Access" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme: callers include an X-PAYMENT header with a signed payment to the provider's address on Base. The response MIME type is application/json. The endpoint accepts POST requests and is discoverable. No API keys or rate limits are advertised; access is purely payment-gated.
Documentation on the site is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact data returned by this Stripe invoices endpoint is unknown from the available material. The platform appears to be a demonstration or early-stage deployment of x402-powered microservices.
Capabilities
Use cases
- —Retrieving Stripe invoice data without traditional API key authentication
- —Programmatic access to invoice records via crypto micropayments
- —Agent-driven invoice lookups settled in USDC on Base
Fit
Best for
- —Developers wanting keyless, pay-per-use access to invoice data
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —High-volume invoice retrieval where per-call pricing adds up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/85 \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs. The purpose and output of this specific Stripe invoices endpoint cannot be determined from available material.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages are all empty beyond a wallet connect prompt
- —No request or response schema provided; the exact data returned by this endpoint is unknown
- —The endpoint path references a specific Stripe invoice ID (85), which may be a demo or placeholder resource
- —Platform appears to be early-stage or a proof-of-concept; reliability and longevity are uncertain
Citations
- —The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 in USDChttps://lowpaymentfee.com/api/v1/stripe/invoices/85
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/85
- —Documentation pages (/docs, /pricing, /api, /README) render only a Connect wallet prompthttps://lowpaymentfee.com/docs