Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 67. 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 data, and utility services — all gated behind the x402 payment protocol on the Base network.
The specific endpoint `/api/v1/portfolios/67/holdings` accepts POST requests and is priced at a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is settled on-chain via the x402 "exact" scheme, meaning the caller includes an X-PAYMENT header with a signed payment proof. No API keys, rate limits, or subscriptions are required — each request is independently paid.
Documentation on the site is extremely sparse. 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 endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation means callers must discover the request format and response shape experimentally.
Capabilities
Use cases
- —Fetching holdings data for a specific portfolio via automated agent
- —Integrating portfolio position data into a trading dashboard
- —Programmatic access to portfolio composition without API key management
Fit
Best for
- —Agents or bots that can pay per-call with USDC on Base
- —Developers wanting keyless, on-demand portfolio data access
- —x402-compatible clients looking for low-cost financial data endpoints
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Bulk data consumers who need thousands of calls at volume-discounted rates
- —Anyone without a Base-compatible wallet or x402 payment capability
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/67/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The purpose of 'portfolio 67 holdings' is unexplained — it is unclear whether this is real financial data or a demo. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or JSON schema describing request parameters or response format.
- —The specific portfolio (ID 67) is hardcoded in the URL with no explanation of what it represents.
- —Response content and data freshness are unknown — callers must discover the schema experimentally.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/portfolios/67/holdings
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no documentation contenthttps://lowpaymentfee.com/docs