x402-gated user data export endpoint on Base, paid per-request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" user export capability via HTTP POST, gated behind the x402 payment protocol. The endpoint returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required per request is 20,000 units of the USDC token (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), with a timeout of 300 seconds.
The hosting site lowpaymentfee.com advertises a broad catalog of x402-payable APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, this specific endpoint (/api/v2/users/export) is not listed on the site's landing page among the advertised APIs, and its exact functionality — what "users/export" returns, what input it expects, and what the response schema looks like — is undocumented in any crawled page.
Because the docs, pricing, and README pages all returned only a "Connect wallet" stub with no substantive content, there is very little information available about the request format, response structure, or actual data returned by this endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to assess what value it delivers.
Capabilities
Use cases
- —Exporting user data via a pay-per-request model without API key registration
- —Programmatic data retrieval gated by on-chain USDC micropayment
- —Agent-driven data export workflows using x402 payment protocol
Fit
Best for
- —Developers wanting keyless, pay-per-use data export
- —AI agents that can handle x402 payment challenges on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Anyone needing detailed API documentation before integrating
- —High-volume bulk export where per-request pricing is cost-prohibitive
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v2/users/export \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint is operational. However, the specific endpoint is not listed among the site's advertised APIs, there is zero documentation on request/response schemas, and all doc pages returned only a wallet-connect stub. The actual purpose of 'users/export' is unclear.
Warnings
- —Endpoint /api/v2/users/export is not listed among the site's publicly advertised APIs
- —No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' stub
- —Request body schema and response schema are completely unknown
- —The maxAmountRequired of 20000 USDC units may not correspond to the $0.02 pricing advertised for other endpoints on the site
Citations
- —The endpoint returns a 402 challenge requiring USDC payment on the Base network with maxAmountRequired of 20000https://lowpaymentfee.com/api/v2/users/export
- —The site advertises APIs at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The /api/v2/users/export endpoint is not listed among the site's publicly advertised API cataloghttps://lowpaymentfee.com
- —Docs, pricing, and README pages return only a 'Connect wallet' stub with no substantive contenthttps://lowpaymentfee.com/docs