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/110`) behind an x402 payment wall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The maximum amount required is 20,000 base units of USDC (0.02 USD per request), settled to a specified wallet address. The endpoint accepts HTTP POST and returns `application/json`.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call 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 commitments. However, this specific listing is for the Stripe invoices endpoint (invoice ID 110), whose exact response payload is undocumented. The site's docs, pricing, and API pages all appear to require a wallet connection and provide no further detail.
Because there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page summary, the actual data returned by this endpoint is unknown. Agents should be aware that the endpoint's purpose ("Premium API Access" for a Stripe invoice) is vague and may simply return invoice metadata or trigger some invoice-related action.
Capabilities
Use cases
- —Retrieving or interacting with a Stripe invoice via a crypto-paid API call
- —Programmatic invoice access without traditional API key authentication
- —Agent-driven payment and data retrieval in a single HTTP round-trip
Fit
Best for
- —Agents that can settle x402 USDC payments on Base
- —Developers wanting keyless, pay-per-call access to invoice data
- —Automated workflows needing Stripe invoice information without Stripe API keys
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume batch invoice processing where $0.02/call adds up quickly
- —Anyone needing non-USDC or non-Base-network payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/110
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to access.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific invoice endpoint is vague. Docs pages return only a wallet-connect prompt with no content.
Warnings
- —No OpenAPI schema or request/response documentation available
- —The exact data returned by this endpoint is unknown — 'Premium API Access' for a Stripe invoice is ambiguous
- —All documentation pages (docs, api, pricing, README) render only a wallet-connect prompt with no useful content
- —The endpoint path includes a hardcoded invoice ID (110); it is unclear whether other IDs are supported or what the resource represents
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC (asset 0x8335…) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/110
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com