Retrieve portfolio holdings via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 41. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure categories — all priced at $0.02 per request and settled via x402 using USDC on the Base network.
The specific endpoint `/api/v1/portfolios/41/holdings` 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 (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 "exact" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a timeout of 300 seconds.
Documentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical documentation. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact structure of the holdings response and what request body parameters are accepted (if any) remain unknown.
Capabilities
Use cases
- —Fetching current holdings for a specific portfolio programmatically
- —Integrating portfolio data into dashboards or trading bots
- —Agents querying portfolio composition before making investment decisions
Fit
Best for
- —Developers needing on-demand portfolio holdings data without API key management
- —AI agents that can settle x402 micropayments on Base
- —Low-volume consumers who prefer pay-per-call over subscriptions
Not for
- —Users needing high-frequency bulk portfolio data (no documented batch endpoint)
- —Anyone requiring detailed API documentation or guaranteed SLAs before integrating
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/41/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages render only 'Connect wallet'. The purpose of 'portfolio 41 holdings' is opaque — it is unclear whether this returns real financial data or placeholder content.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'
- —No request body schema or response schema documented; callers must guess at the payload format
- —The endpoint references a hardcoded portfolio ID (41); it is unclear how to discover or specify other portfolios
- —The platform lists many endpoint categories but this specific endpoint (/portfolios/41/holdings) is not listed on the landing page, raising questions about its status
Citations
- —The x402 challenge requires maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network, equaling $0.02https://lowpaymentfee.com/api/v1/portfolios/41/holdings
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs