x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/stripe/charges/89` is listed as "Premium API Access" with a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). It accepts POST requests and returns application/json responses. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base L2 network using the exact payment scheme.
Note that the endpoint's actual functionality behind the paywall is not well documented. The path suggests it relates to Stripe charges, but no request/response schema, parameter documentation, or usage examples are available from the crawled pages. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without paying and inspecting the actual response, the precise behavior of this endpoint remains unclear.
Capabilities
Use cases
- —Programmatic access to a premium API resource without needing API keys or subscriptions
- —Agent-driven workflows that need to pay per-call using on-chain USDC on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that can settle micropayments in USDC on Base
- —Users who want pay-as-you-go API access without signup
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Applications requiring free or fiat-only payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/89 \
-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 ($0.02 USDC on Base). However, there is no documentation of request parameters, response schema, or actual functionality behind the paywall. The docs/API/pricing pages are all empty beyond a wallet connect prompt. The endpoint's purpose ("Premium API Access" at a Stripe charges path) is ambiguous.
Warnings
- —No request or response schema documented — actual functionality behind the paywall is unknown
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content
- —The endpoint path '/api/v1/stripe/charges/89' suggests Stripe-related functionality but this is unconfirmed
- —No OpenAPI spec or AI plugin manifest available
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/89
- —Platform pricing is $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/charges/89