Retrieve portfolio holdings data via x402 micropayment on Base network for $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns holdings data for portfolio #57 via an x402-gated POST request. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.
The x402 challenge confirms the endpoint is live and accepts exact-scheme payments to a specified wallet address. The max amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is granted per-request upon payment. The response MIME type is application/json.
Documentation is extremely sparse. The crawled docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response body documentation, and no description of what "holdings" data actually contains. The endpoint path suggests it returns asset holdings for a specific portfolio (ID 57), but the exact fields, request body format, and response structure are unknown.
Capabilities
Use cases
- —Fetching current holdings for a specific investment portfolio
- —Integrating portfolio data into dashboards or analytics tools
- —Automated portfolio monitoring by AI agents
Fit
Best for
- —Developers needing on-demand portfolio holdings data without API key management
- —AI agents that can settle x402 micropayments on Base
- —Quick one-off lookups of portfolio composition
Not for
- —Users who need detailed API documentation before integrating
- —Bulk or high-frequency data retrieval where per-request fees add up
- —Anyone needing holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 57)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/57/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty. The specific purpose of portfolio 57 holdings is unexplained.
Warnings
- —No API documentation available — docs, pricing, and API pages all render only a wallet-connect prompt
- —No request body schema or response schema documented
- —Endpoint is hardcoded to portfolio ID 57 with no explanation of what this portfolio represents
- —No OpenAPI or machine-readable spec provided
- —The broader platform lists many API categories but none have visible documentation
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/57/holdings
- —All APIs priced at $0.02 per request 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/57/holdings