Portfolio performance data via x402 micropayment on Base network, $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 38. 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/38/performance` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The payment timeout is 300 seconds.
Documentation is extremely sparse. The platform's landing page lists many API categories but provides no schema details, request/response examples, or parameter documentation for any endpoint. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. As a result, the exact request body format and response structure for this portfolio performance endpoint are unknown.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or reporting tools
- —Automated portfolio monitoring by AI agents using micropayments
Fit
Best for
- —Agents needing on-demand portfolio performance data without API key management
- —Developers wanting pay-per-use financial data with no subscription commitment
- —x402-compatible clients on the Base network
Not for
- —Users needing detailed API documentation or schema before integrating
- —Bulk historical data retrieval (pay-per-request model may be costly at scale)
- —Users who cannot transact in USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/38/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on request parameters, response schema, or what 'portfolio 38' represents. The docs pages are empty. This is effectively a stub listing with only payment metadata confirmed.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.
- —Request body schema and response format are completely unknown.
- —It is unclear what portfolio ID 38 refers to or whether other portfolio IDs are accessible.
- —The endpoint is specific to a single portfolio; generalizability is unknown.
Citations
- —The endpoint returns a 402 challenge requiring 20,000 base units of USDC on Base ($0.02) per request.https://lowpaymentfee.com/api/v1/portfolios/38/performance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/38/performance