Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 70) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per request. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol. Documentation pages (/docs, /pricing, /api) appear to require a wallet connection and contain no additional public content.
Because this specific endpoint path references "portfolios/70/performance," it likely returns performance metrics (e.g., returns, time-series data) for a pre-defined portfolio. However, no schema for the response body or request body is documented, so the exact fields returned are unknown. The x402 challenge confirms the endpoint is live and accepting payment-gated requests.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked portfolio
- —Integrating portfolio return data into dashboards or agent workflows
- —Programmatic access to portfolio analytics without API key management
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data with per-call payment
- —Developers who prefer wallet-based access over traditional API key signup
- —Low-volume consumers who want pay-per-use pricing without subscriptions
Not for
- —Users needing detailed API documentation or response schema before integrating
- —High-frequency consumers who would benefit from bulk/subscription pricing
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/70/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no documented request/response format, and the docs/pricing/api pages are empty (wallet-gated). The endpoint's actual output is entirely unknown, making integration speculative.
Warnings
- —No response schema or request body schema documented — actual data returned is unknown
- —Documentation pages (/docs, /pricing, /api) are behind a wallet connection and contain no public content
- —This endpoint targets a specific portfolio ID (70); it is unclear whether other portfolio IDs are available or how they are discovered
- —Provider site lists many API categories but this specific endpoint is not listed on the homepage catalog
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/70/performance
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/70/performance
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com