x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment challenge. The specific resource path (`/api/v1/stripe/invoices/169`) suggests it returns or processes a Stripe invoice record (invoice ID 169). Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-scheme challenge requiring up to 0.02 USDC per request (20,000 base units at 6 decimals). The endpoint accepts HTTP POST and returns application/json.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint listed here is scoped to the Stripe invoices path, and no detailed documentation or request/response schemas were found in the crawl. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Because there is no OpenAPI spec, no request body schema, and no example responses available, the exact input parameters and output format for this endpoint remain unknown. The x402 challenge is live and well-formed, confirming the endpoint is operational.
Capabilities
Use cases
- —Retrieving or processing a specific Stripe invoice via a crypto-paid API call
- —Integrating pay-per-call invoice access into an agent workflow without API keys
- —Settling micro-transactions for invoice data on the Base L2 network
Fit
Best for
- —Agents needing keyless, pay-per-call access to invoice data
- —Developers experimenting with x402 payment protocol integrations
- —Workflows requiring on-chain USDC settlement for API access
Not for
- —Bulk invoice processing requiring thousands of calls (no volume discounts documented)
- —Users who need detailed API documentation or guaranteed SLAs
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/169 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint is operational and pricing is clear ($0.02 USDC). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of this specific invoice endpoint is unclear. Effectively a stub listing.
Warnings
- —No OpenAPI or request/response schema available — input parameters and output format are unknown
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content
- —The specific purpose of /api/v1/stripe/invoices/169 (a hardcoded invoice ID) is unclear — it may be a demo or test resource
- —No SLA, rate limit, or uptime guarantees documented
Citations
- —The x402 challenge requires up to 20,000 base units of USDC (0.02 USDC) on the Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/169
- —The platform advertises $0.02 per request 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/169