x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 151) behind an x402 paywall. The endpoint accepts POST requests and returns application/json responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).
The parent site lowpaymentfee.com hosts a broader catalog of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and instant access.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The specific purpose and data returned by the /stripe/invoices/151 endpoint is unclear beyond the generic "Premium API Access" label. The x402 challenge was successfully captured (HTTP 402), confirming the endpoint is live.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single micropayment without API key registration
- —Programmatic access to invoice #151 for automated billing workflows
- —Agent-driven payment-gated API consumption on Base L2
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments in USDC on Base
- —Prototyping micropayment-gated API patterns
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —Bulk invoice retrieval or batch processing across many invoices
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/151 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but there is zero documentation on request format, response schema, or what data the endpoint actually returns. The /docs, /pricing, and /README pages are all empty beyond a wallet-connect prompt. The specific purpose of 'stripe/invoices/151' is opaque.
Warnings
- —No OpenAPI spec or request/response schema available
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The specific data returned by /stripe/invoices/151 is undocumented — 'Premium API Access' is the only description
- —Purpose of exposing a single Stripe invoice (ID 151) behind a paywall is unclear
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base network using USDChttps://lowpaymentfee.com/api/v1/stripe/invoices/151
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per requesthttps://lowpaymentfee.com/api/v1/stripe/invoices/151
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' texthttps://lowpaymentfee.com/docs