Portfolio holdings data via x402 micropayment on Base network for $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 33. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.
The specific endpoint `/api/v1/portfolios/33/holdings` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header per the x402 protocol. The payment timeout is 300 seconds.
Documentation on the platform is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains. The endpoint is live (returns a proper 402 challenge), but the actual data returned after payment is unknown from available materials.
Capabilities
Use cases
- —Retrieve holdings data for a specific portfolio via micropayment
- —Integrate portfolio data into trading bots or dashboards without API key management
- —Pay-per-call access to financial portfolio information on Base network
Fit
Best for
- —Agents needing on-demand portfolio holdings without subscription commitments
- —Developers prototyping financial dashboards with instant API access
- —x402-compatible clients on the Base network
Not for
- —Users needing detailed API documentation or schema guarantees before integrating
- —Bulk data retrieval where per-request pricing becomes expensive
- —Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 33)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/33/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 ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what data the holdings endpoint actually returns. The docs pages are all empty wallet-connect stubs. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README all render only a wallet connect prompt
- —No OpenAPI or request/response schema provided; response format is completely unknown
- —Endpoint is scoped to a single portfolio ID (33); unclear if other portfolio IDs are available
- —Platform appears to be a generic demo or early-stage project with many listed endpoints but no substantive docs
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/33/holdings
- —Platform pricing is $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/33/holdings