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 11. It is part of a broader suite of x402-enabled APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network via the x402 protocol.
The specific endpoint `/api/v1/portfolios/11/holdings` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation is extremely sparse. The crawled 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 accepts. The endpoint's purpose — portfolio holdings — is inferred solely from the URL path and the generic "Premium API Access" description. Users should expect a finance-related JSON response but will need to experiment to discover the exact schema.
Capabilities
Use cases
- —Fetching current holdings for a specific portfolio programmatically
- —Integrating portfolio data into dashboards or trading bots
- —Agents autonomously purchasing financial data per-request without API keys
Fit
Best for
- —Developers wanting keyless, pay-per-call access to portfolio data
- —AI agents that can settle x402 payments on Base
- —Users who prefer micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed schema stability
- —Bulk data consumers who need thousands of calls at volume-discounted rates
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/11/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, confirming pricing and network. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual data returned and required POST body are completely unknown, making this effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'
- —No OpenAPI or JSON schema for request or response bodies
- —The specific data returned by the holdings endpoint is unknown — portfolio 11 is hardcoded in the URL with no explanation
- —No information on what POST body parameters are accepted
Citations
- —The endpoint returns a 402 x402 challenge requiring 20,000 base units of USDC on Base (=$0.02)https://lowpaymentfee.com/api/v1/portfolios/11/holdings
- —All endpoints on the platform are 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/11/holdings