x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 126) behind an x402 paywall. The site operates a suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific endpoint `/api/v1/stripe/invoices/126` is listed under the title "Premium API Access." The x402 challenge confirms it accepts POST requests, requires up to 20,000 base units of USDC (0x8335…on Base, 6 decimals → $0.02), and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" payment scheme with a 300-second timeout.
Documentation on the site 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 documentation, and no example payloads available. The actual data returned by this endpoint after successful payment is unknown; the description "Premium API Access" and the path segment "stripe/invoices" suggest it may return or interact with Stripe invoice data, but this cannot be confirmed from available material.
Capabilities
Use cases
- —Retrieving Stripe invoice data programmatically via a single micropayment
- —Agent-driven access to paid API resources without pre-registration or API keys
- —Demonstrating x402 payment protocol integration on Base network
Fit
Best for
- —Developers experimenting with x402 payment flows
- —Agents that need keyless, pay-per-call API access on Base
- —Projects requiring Stripe invoice data without subscription overhead
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need non-crypto payment options
- —High-volume batch processing where per-request fees add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/126 \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"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 actual functionality behind "Premium API Access" / "stripe/invoices/126" is opaque. Docs pages return only wallet-connect prompts.
Warnings
- —No OpenAPI spec or request/response schema available
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content
- —The actual data returned by this endpoint after payment is unknown
- —Endpoint path suggests Stripe invoice interaction but this is unconfirmed
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/126
- —All APIs on the site are priced at $0.02 per request 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/126