Portfolio performance data via x402 micropayment on Base network for $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 31. It is part of a broader platform offering various pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories. The endpoint uses the x402 payment protocol, settling in USDC on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals).
The platform advertises a simple pricing model: $0.02 per request with no API keys, no rate limits, no minimums, and instant access. The endpoint accepts POST requests and returns JSON. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what "portfolio performance" data actually contains or what parameters the POST body expects.
Because the specific endpoint path (`/portfolios/31/performance`) is not listed on the site's landing page among the advertised APIs, it may be a custom or less-documented route. The x402 challenge confirms the endpoint is live and accepting payment-gated requests, but the lack of any input/output schema or documentation makes integration speculative.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or reporting tools
- —Agent-driven portfolio monitoring with per-call micropayments
Fit
Best for
- —Developers needing on-demand portfolio performance data without subscriptions
- —AI agents that can settle x402 payments in USDC on Base
- —Users who want pay-per-use financial data without API key management
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone needing portfolio data for IDs other than 31 (no evidence other IDs are supported at this path)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/31/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response schema, or what 'portfolio performance' actually returns. Docs pages are empty. No OpenAPI spec. This is effectively a stub listing.
Warnings
- —No request or response schema available — input parameters are unknown
- —Documentation pages (/docs, /api, /pricing, /README) contain no useful content beyond 'Connect wallet'
- —This specific endpoint path (/portfolios/31/performance) is not listed among the site's advertised APIs
- —No information on what portfolio ID 31 represents or whether other portfolio IDs are accessible
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/31/performance
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02https://lowpaymentfee.com/api/v1/portfolios/31/performance
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no technical documentationhttps://lowpaymentfee.com/docs