x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.
What it does
This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/97`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The endpoint accepts POST requests and returns JSON.
The specific endpoint listed here appears to be a single Stripe invoice resource (invoice ID 97), which is distinct from the broader suite of APIs advertised on the lowpaymentfee.com homepage (analytics, AI/ML, finance, infrastructure utilities). The site advertises a flat $0.02 per request across its API catalog, and this endpoint's x402 challenge specifies a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's stated pricing.
The provider's landing page lists numerous API categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities. However, this specific listing is for a Stripe invoices endpoint, which does not appear in the homepage catalog. Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schema of this endpoint are unknown.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a pay-per-call x402 flow
- —Demonstrating x402 protocol integration with USDC on Base
- —Agent-driven invoice lookup without API keys
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call access to invoice data
- —Projects already using USDC on Base
Not for
- —Production Stripe invoice management (use Stripe's own API directly)
- —Users who need detailed documentation or response schemas before integrating
- —High-volume invoice retrieval where per-call fees add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/97
# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to access.Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no response schema, no example responses, and the specific endpoint (Stripe invoices/97) is not listed in the provider's own catalog. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No documentation available — all doc pages return only 'Connect wallet'
- —This specific endpoint (/api/v1/stripe/invoices/97) is not listed in the provider's homepage API catalog
- —No response schema or example responses available
- —Unknown what data this endpoint actually returns
- —Endpoint references a single invoice ID (97), unclear if this is a demo or production resource
Citations
- —The site advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/97
- —Documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs