x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment challenge. The specific resource `/api/v1/stripe/invoices/74` appears to be a Stripe invoice-related API call, though the exact functionality (e.g., fetching invoice details, creating invoices) is not documented beyond the generic title. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme.
The endpoint charges a maximum of 20,000 base units of USDC per request. Since USDC uses 6 decimals, this equals $0.02 per call — consistent with the site-wide flat pricing of $0.02/request advertised on the landing page. The provider emphasizes no API keys, no rate limits, and instant access. The x402 challenge specifies a 300-second payment timeout and accepts POST requests.
lowpaymentfee.com also hosts a broader catalog of x402-gated APIs spanning data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. However, the docs, pricing, and API pages returned only "Connect wallet" with no substantive documentation, so details about request/response schemas for this specific invoice endpoint are unavailable.
Capabilities
Use cases
- —Fetching or interacting with Stripe invoice data via a single paid API call
- —Agent-driven invoice retrieval without traditional API key provisioning
- —Programmatic access to invoice information settled in USDC on Base
Fit
Best for
- —Agents or bots that need keyless, pay-per-call access to invoice data
- —Developers wanting to test x402 payment flows with low-cost endpoints
- —Crypto-native applications that prefer on-chain settlement for API usage
Not for
- —High-volume invoice processing where $0.02/call adds up significantly
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/74 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no request/response schema, and no explanation of what the Stripe invoices endpoint actually does. The docs/pricing/API pages are all blank beyond 'Connect wallet'.
Warnings
- —No request or response schema available — functionality of /api/v1/stripe/invoices/74 is unknown beyond the title 'Premium API Access'
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no useful content
- —The endpoint path references a specific invoice ID (74), which may be a demo or placeholder resource
- —No OpenAPI spec, no ai-plugin manifest, and no agents.txt discovered
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/stripe/invoices/74
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/74
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The provider offers additional API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com