x402-gated Stripe invoice endpoint on Base, paying with USDC per request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/161` appears to be one of many pay-per-call endpoints offered by the lowpaymentfee.com platform. The x402 challenge confirms it is live and accepts payment in USDC (contract 0x8335…2913) on the Base network, with a maximum amount of 20,000 base units — which, at 6 decimals for USDC, equals $0.02 per request.
The broader lowpaymentfee.com platform advertises a range of API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required. However, the specific endpoint in this listing (`/api/v1/stripe/invoices/161`) is labeled "Premium API Access" and does not clearly map to any of those documented categories.
Documentation is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The actual functionality behind this particular invoice endpoint is unclear from the available material.
Capabilities
Use cases
- —Accessing a Stripe invoice resource via x402 micropayment on Base
- —Agent-driven pay-per-call API consumption without API key management
- —Programmatic invoice retrieval settled in USDC
Fit
Best for
- —Agents or scripts that need keyless, pay-per-use API access
- —Developers experimenting with x402 payment protocol on Base
- —Use cases requiring low-friction micropayments ($0.02/call)
Not for
- —Users needing well-documented API contracts with full request/response schemas
- —High-volume use cases where per-request crypto payments add overhead
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/161
# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of the '/stripe/invoices/161' resource is undocumented. Docs pages return only a wallet-connect prompt.
Warnings
- —No OpenAPI spec or request/response schema available
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content
- —The specific endpoint '/api/v1/stripe/invoices/161' is not listed among the platform's documented API categories — its actual functionality is unclear
- —No examples of successful responses are available
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/invoices/161
- —All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs