Portfolio holdings data via x402 micropayment on Base network for $0.02/request.
What it does
This endpoint provides access to portfolio holdings data (portfolio ID 74) through the x402 payment protocol. It is hosted on lowpaymentfee.com, a platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, and infrastructure utilities—all settled via USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 "exact" scheme. The maximum amount required is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments—callers pay per request.
Documentation beyond the landing page is sparse; the /docs, /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail. No OpenAPI schema, request body specification, or response schema is published. The endpoint is live (returns a valid 402 challenge), but the exact request format and response structure for portfolio holdings are undocumented.
Capabilities
Use cases
- —Retrieve holdings for a specific portfolio on demand
- —Integrate portfolio data into trading bots or dashboards
- —Agent-driven portfolio monitoring without API key management
Fit
Best for
- —Developers needing quick, keyless access to portfolio holdings data
- —AI agents that can settle x402 payments autonomously
- —Low-volume consumers who prefer pay-per-call over subscriptions
Not for
- —High-frequency bulk data retrieval (no documented batch endpoint)
- —Users who need detailed API documentation or SDKs before integrating
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/74/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no published documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty wallet-connect prompts. Effectively a stub listing with confirmed liveness.
Warnings
- —No request body schema documented—callers must guess or reverse-engineer the expected POST payload.
- —No response schema or example response available.
- —Documentation pages (/docs, /pricing, /README) are non-functional, showing only a wallet-connect prompt.
- —The specific endpoint path (/portfolios/74/holdings) is not listed on the provider's landing page; it may be an internal or unlisted resource.
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/74/holdings
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/74/holdings