Retrieve portfolio holdings data via x402 micropayment on Base for $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 8. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.
The specific endpoint `/api/v1/portfolios/8/holdings` accepts POST requests and is priced at $0.02 per call (20,000 base units of USDC on Base, which uses 6 decimals). Payment is settled on-chain via USDC (contract 0x8335…2913) to the payee address 0x1A2B…85F3. No API keys or rate limits are required; access is granted instantly upon valid x402 payment. The endpoint returns JSON.
Documentation on the site is extremely sparse — the docs, API, pricing, 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 or what parameters the POST body expects. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know exactly what data is returned or how to structure a request body.
Capabilities
Use cases
- —Fetching current holdings for a specific portfolio
- —Integrating portfolio data into trading dashboards
- —Automated portfolio monitoring by AI agents
Fit
Best for
- —Agents needing on-demand portfolio holdings without API key signup
- —Developers wanting pay-per-call access to portfolio data on Base
- —Micropayment-gated financial data retrieval
Not for
- —Users who need detailed API documentation before integrating
- —Bulk historical portfolio data downloads (no evidence of batch support)
- —Non-crypto-native users unfamiliar with x402 payment flows
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/8/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and the site's docs pages are empty stubs. The purpose of 'portfolio 8 holdings' is not explained anywhere. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No request body schema or response schema provided; callers must guess at the POST body format
- —The endpoint is for a specific portfolio ID (8) with no explanation of what this portfolio represents
- —No OpenAPI or machine-readable schema discovered
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/portfolios/8/holdings
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/8/holdings