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 55. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is individually paid.
The specific endpoint `/api/v1/portfolios/55/performance` is not listed on the site's main landing page among the advertised API categories, so it may be an unlisted or specialized route. The platform's documentation, pricing, and API pages returned only a "Connect wallet" prompt with no further detail, so the exact request body schema and response format are unknown. The x402 challenge confirms the endpoint is live and accepting payment-gated requests.
Capabilities
Use cases
- —Retrieve performance metrics for a specific investment portfolio
- —Integrate portfolio performance data into dashboards or reporting tools
- —Automate portfolio monitoring via agent-driven micropayment calls
Fit
Best for
- —Agents needing on-demand portfolio performance data without API key management
- —Developers building finance dashboards with pay-per-use data
- —Automated systems that need low-friction access to portfolio analytics
Not for
- —Bulk historical portfolio data downloads (no batch endpoint documented)
- —Users who need detailed API documentation or request/response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/55/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge confirms the endpoint is live with clear pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and the specific portfolio endpoint is not listed among the site's advertised APIs. Documentation pages returned only wallet-connect prompts with no content.
Warnings
- —No request body schema or response schema documented — input/output format is unknown
- —This specific endpoint (/api/v1/portfolios/55/performance) is not listed among the site's advertised APIs; it may be unlisted or experimental
- —All documentation, pricing, and API pages beyond the landing page returned only a 'Connect wallet' prompt with no usable content
- —The hardcoded portfolio ID (55) suggests this may be a single-resource endpoint rather than a parameterized one
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/55/performance
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/55/performance