x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com exposes a specific Stripe invoice resource (`/api/v1/stripe/invoices/57`) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals). The payee address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific listing is for the Stripe invoices endpoint, and no documentation was found describing the request body schema or the response format for this particular resource. The docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Because the endpoint is live (returning a valid 402 challenge) but lacks any documentation about what data it returns or what input it expects, agents should treat this as a low-documentation endpoint. The x402 challenge confirms it is operational and accepts POST with an exact-scheme USDC payment on Base.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a pay-per-call model without traditional API keys
- —Programmatic access to invoice #57 for automated accounting or reconciliation workflows
- —Agent-driven payment and data retrieval using x402 protocol on Base
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Use cases requiring keyless, per-request access to invoice data
- —Developers experimenting with x402 payment protocol integrations
Not for
- —Users who need bulk invoice retrieval or batch operations
- —Anyone without a Base-compatible USDC wallet
- —Use cases requiring detailed API documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/57 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing and network info. However, there is no documentation for this specific endpoint — no request schema, no response schema, no examples. The docs pages are empty (wallet-connect only). The endpoint path suggests a single fixed invoice resource rather than a general-purpose API.
Warnings
- —No documentation found for this specific endpoint — request body and response format are unknown.
- —All doc/pricing/API/README pages returned only 'Connect wallet' with no content.
- —Endpoint path references a specific invoice ID (57), which may be a demo or placeholder resource.
- —The broader platform advertises many endpoints but none have visible documentation.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units.https://lowpaymentfee.com/api/v1/stripe/invoices/57
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/stripe/invoices/57
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories.https://lowpaymentfee.com