Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 6. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.
The specific endpoint `/api/v1/portfolios/6/performance` is categorized under the platform's premium API access tier. It accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the payTo address on Base. No API keys or rate limits are advertised — access is gated purely by micropayment.
Documentation is extremely sparse. The platform's docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint path suggests it returns performance metrics for a specific portfolio (ID 6), but the exact schema and semantics are unknown.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or agent workflows
- —Paying per-request for financial data without subscription commitments
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data with no signup
- —Developers exploring x402 micropayment-gated APIs on Base
- —Low-volume consumers who prefer pay-per-call over subscriptions
Not for
- —Users needing detailed API documentation or response schema before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring portfolio data for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 6)
Quick start
# The endpoint requires an x402 payment header (USDC on Base, $0.02).
# Use an x402-compatible client to handle payment automatically.
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/6/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response schema, or what 'portfolio 6 performance' actually returns. Docs pages are empty. No OpenAPI spec or examples exist. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content
- —No request or response schema provided; the actual data returned is unknown
- —Endpoint is hardcoded to portfolio ID 6 with no explanation of what this portfolio represents
- —No OpenAPI or machine-readable schema discovered
Citations
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/6/performance
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com