x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/62`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The challenge specifies a maximum amount of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals), consistent with the site-wide $0.02/request pricing advertised on the landing page.
The broader lowpaymentfee.com platform advertises multiple API categories — data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here is under the `/stripe/invoices/` path, which is not explicitly documented on the landing page among the advertised API categories. Its exact response payload is unknown; the x402 challenge describes the output MIME type as `application/json` and the input method as HTTP POST.
Documentation beyond the landing page is essentially empty — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response examples, and no detailed description of what the invoice endpoint returns. Treat this as a minimally documented endpoint whose actual utility should be verified before relying on it in production.
Capabilities
Use cases
- —Retrieving a Stripe invoice record via a single USDC micropayment
- —Agent-driven invoice lookup without traditional API key authentication
- —Programmatic access to invoice data settled on Base L2
Fit
Best for
- —Agents that can settle x402 USDC payments on Base
- —Low-volume, pay-as-you-go invoice data retrieval
- —Developers exploring x402 protocol integrations
Not for
- —High-volume invoice processing requiring bulk pricing or SLAs
- —Users who need detailed API documentation or guaranteed schema stability
- —Non-crypto workflows that cannot settle USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/62
# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to access the resource.Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific /stripe/invoices/62 path is not listed among the site's advertised APIs. Effectively a stub listing.
Warnings
- —No OpenAPI spec or detailed documentation available
- —The /stripe/invoices/ path is not listed among the site's publicly advertised API endpoints
- —All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no content
- —Exact request parameters and response schema are unknown
- —The endpoint path references a specific invoice ID (62); unclear if other IDs are accessible or what the resource represents
Citations
- —The x402 challenge requests a maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/62
- —Site-wide pricing is advertised as $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/62