Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for a specific portfolio (ID 20) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML, finance/Web3, and infrastructure APIs, all priced at $0.02 per request and settled in USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the provider's address on Base. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.
Documentation beyond the landing page is extremely sparse. The /docs, /pricing, /api, and /README pages all resolve to a minimal "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data content, request body format, and response structure for portfolio holdings are unknown.
Capabilities
Use cases
- —Retrieving current holdings for a specific investment portfolio
- —Integrating portfolio data into dashboards or trading bots
- —Agent-driven portfolio monitoring with per-call micropayments
Fit
Best for
- —Agents needing on-demand portfolio holdings without API key management
- —Developers who want pay-per-use financial data on Base network
- —Micropayment-based access to portfolio information
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —Bulk or high-frequency data retrieval where per-call pricing is inefficient
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/20/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual data returned and expected request body are completely unknown, making this effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt
- —No OpenAPI or schema definition found; request body format and response structure are unknown
- —The specific portfolio ID (20) is hardcoded in the URL; unclear if other portfolio IDs are accessible or what they represent
- —Provider site appears to list many endpoints but none have documented schemas
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/20/holdings
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02https://lowpaymentfee.com/api/v1/portfolios/20/holdings
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs