x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a specific Stripe invoice resource (invoice ID 104) behind an x402 paywall. It is part of a broader platform that offers 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/104` 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 an `X-PAYMENT` header using the x402 "exact" scheme. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.
Documentation on the site is extremely thin — 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 schema documentation, and no examples of what the invoice endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data or functionality is actually delivered upon successful payment.
Capabilities
Use cases
- —Retrieving Stripe invoice data (invoice 104) via a single micropayment
- —Programmatic access to invoice details without traditional API key management
- —Agent-driven invoice lookups settled in USDC on Base
Fit
Best for
- —Developers or agents needing one-off Stripe invoice data without subscription commitments
- —x402-compatible agents that can settle USDC micropayments on Base
- —Exploring pay-per-request API patterns with crypto settlement
Not for
- —Users needing bulk or batch invoice retrieval (no documented batch endpoint)
- —Anyone requiring detailed API documentation or guaranteed SLAs before integrating
- —Use cases requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/104 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is essentially no documentation: no OpenAPI spec, no request/response schema, no examples, and all doc pages render only 'Connect wallet'. The purpose of this specific invoice endpoint is unclear beyond its label. Score reflects a confirmed-live but effectively undocumented stub.
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 functionality of /api/v1/stripe/invoices/104 is undocumented — unclear what data is returned
- —The endpoint path references a specific Stripe invoice ID (104); generalizability is unknown
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/104
- —The platform advertises $0.02 per 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/104
- —Documentation pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs