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 101) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-request APIs 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/101` is labeled "Premium API Access" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 exact scheme: callers attach an X-PAYMENT header with a signed USDC payment on Base to the payTo address. No API keys, rate limits, or upfront commitments are required — access is instant upon valid payment. The response MIME type is application/json.
Documentation on the site is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact data returned by this invoice endpoint is unknown — it could be Stripe invoice details, a receipt, or something else entirely. The endpoint is confirmed live (402 challenge captured successfully).
Capabilities
Use cases
- —Retrieving Stripe invoice data without API key management
- —Agent-driven payment-per-request access to invoice records
- —Programmatic access to invoice #101 via crypto micropayment
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or schemas before integrating
- —Bulk invoice retrieval across many records (only invoice 101 is exposed at this path)
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/101 \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on request parameters, response schema, or what data the endpoint actually returns. The docs pages are all empty wallet-connect stubs. The endpoint path suggests Stripe invoice data but this is unconfirmed.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content
- —No OpenAPI spec or request/response schema provided
- —The exact data returned by this endpoint is unknown; 'Premium API Access' is a generic label
- —The broader platform lists many endpoints but none have documented schemas
Citations
- —Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/101
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/101
- —Docs, pricing, API, and README pages contain only 'Connect wallet' with no documentationhttps://lowpaymentfee.com/docs