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 150) 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 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 market data, and utility services (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here (/api/v1/stripe/invoices/150) is not among the publicly documented API categories on the landing page, so its exact response payload and purpose are unclear.
The x402 challenge was successfully captured (HTTP 402 with a well-formed accepts array), confirming the endpoint is live. No OpenAPI spec, detailed documentation, or example responses were available from the crawl — the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a crypto-paywall without traditional API keys
- —Programmatic access to invoice records settled with USDC on Base
- —Agent-driven invoice lookup with per-call micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-call access to invoice data
- —AI agents that can settle x402 payments in USDC on Base
- —Scenarios requiring no subscription or rate-limit constraints
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —Bulk invoice retrieval where per-call pricing would be expensive
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/150
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing. However, there is no OpenAPI schema, no example request/response, and no documentation beyond a landing page listing. The specific endpoint (/api/v1/stripe/invoices/150) is not documented on the site. This is effectively a stub listing.
Warnings
- —No OpenAPI spec or detailed documentation available
- —The /api/v1/stripe/invoices/150 endpoint is not listed among the publicly advertised APIs on the landing page
- —Docs, API, pricing, and README pages returned no substantive content (only 'Connect wallet')
- —Response schema and expected POST body are unknown
Citations
- —The endpoint returns a 402 x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/stripe/invoices/150
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/invoices/150