x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 66) behind an x402 paywall. The provider operates a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 protocol on the Base network and settled in USDC.
The specific endpoint `/api/v1/stripe/invoices/66` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints with no API keys, no rate limits, and no minimum commitments.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data the invoice endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what payload to send or what response to expect.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single micropayment without needing an API key
- —Programmatic access to invoice information settled on-chain in USDC
- —Agent-driven invoice lookups where per-call billing is preferred over subscriptions
Fit
Best for
- —Developers or agents needing keyless, pay-per-use access to invoice data
- —On-chain payment workflows that settle in USDC on Base
- —Quick one-off invoice lookups without subscription overhead
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume invoice processing where per-call costs add up versus a flat subscription
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/66 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose of the specific invoice endpoint is unclear beyond its title.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; it is unknown what POST body to send or what the response looks like.
- —The endpoint targets a specific invoice ID (66); it is unclear whether this is a demo resource or a real invoice.
- —The broader platform lists many endpoints (AI, finance, utils) but none have documented schemas or examples.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/stripe/invoices/66
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/stripe/invoices/66
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no substantive documentation.https://lowpaymentfee.com/docs