Retrieve portfolio holdings data via x402 micropayment on Base network for $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns holdings data for portfolio #86 via a POST request, gated behind an x402 payment challenge. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/portfolios/86/holdings` appears to be a finance-related resource that returns portfolio holdings information in JSON format. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof for 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the specified payTo address on Base. No API keys, rate limits, or subscriptions are required — each call 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 additional technical content. 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 returned after successful payment is unknown from the available material.
Capabilities
Use cases
- —Fetching holdings data for a specific investment portfolio on demand
- —Integrating portfolio visibility into agent workflows without API key management
- —Paying per-request for financial data using USDC on Base
Fit
Best for
- —Agents or apps that need on-demand portfolio holdings without subscriptions
- —Developers experimenting with x402 pay-per-call patterns
- —Low-volume consumers who want to avoid API key registration
Not for
- —High-frequency bulk data retrieval where per-call costs add up
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone needing holdings for arbitrary portfolios (this endpoint is scoped to portfolio 86)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/86/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no documentation, no request/response schema, no examples, and the docs pages are empty. The purpose of 'portfolio 86 holdings' is unexplained. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, README pages all show only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The endpoint is scoped to a single hardcoded portfolio ID (86) with no explanation of what this portfolio contains
- —Actual response format after successful payment is completely unknown
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/86/holdings
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/86/holdings
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com