Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 6. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated behind the x402 payment protocol on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is paid individually via the X-PAYMENT header. The x402 challenge was confirmed live, returning a proper 402 response with version 1 of the protocol.
Documentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains. The specific endpoint path suggests it returns holdings for a particular portfolio (ID 6), but the structure of the response and what input parameters (if any) the POST body expects are unknown.
Capabilities
Use cases
- —Retrieving portfolio holdings data programmatically with per-request micropayments
- —Integrating portfolio data into trading bots or dashboards without subscription overhead
- —Agent-driven portfolio analysis where each data fetch is paid on-demand
Fit
Best for
- —Developers wanting keyless, pay-per-call access to portfolio data
- —AI agents that need on-demand financial data with crypto micropayments
- —Low-volume or sporadic consumers who don't want subscription commitments
Not for
- —High-frequency consumers needing bulk data at lower per-unit cost
- —Users without a Base network wallet or USDC balance
- —Anyone needing detailed API documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/6/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific portfolio ID 6 endpoint is unclear, and input/output formats are entirely unknown.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema describing request body or response format
- —The endpoint is hardcoded to portfolio ID 6; unclear if other portfolio IDs are available or what this portfolio represents
- —No information on error handling, response fields, or data freshness
Citations
- —Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/6/holdings
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/6/holdings
- —Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs