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 56. 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/56/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. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint path suggests it returns a list of asset holdings for a specific portfolio, but the exact schema of the request body and response payload is unknown.
Capabilities
Use cases
- —Fetching current holdings for a specific investment portfolio
- —Integrating portfolio position data into dashboards or analytics tools
- —Automated portfolio monitoring by AI agents
Fit
Best for
- —Agents needing on-demand portfolio holdings without API key management
- —Micropayment-gated access to financial data
- —Quick integration with no signup or rate limits
Not for
- —Users who need detailed API documentation or schema guarantees before integrating
- —Querying arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 56)
- —High-volume batch retrieval where per-request pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/56/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, but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint is scoped to a single hardcoded portfolio ID. The crawled pages beyond the landing page are empty. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.
- —No OpenAPI or request/response schema provided; request body format and response structure are completely unknown.
- —Endpoint is hardcoded to portfolio ID 56; unclear if other portfolio IDs are accessible or what data this portfolio represents.
- —The broader platform lists many endpoints but none have documented schemas or examples.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base ($0.02).https://lowpaymentfee.com/api/v1/portfolios/56/holdings
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/portfolios/56/holdings