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 53. 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 market data, and utility services — all gated behind the x402 payment protocol on the Base network.
The specific endpoint `/api/v1/portfolios/53/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 upfront commitments are required — access is instant once payment is attached.
Documentation on the site is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned 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 or what parameters the POST body accepts. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to use without experimentation.
Capabilities
Use cases
- —Fetching current holdings for a specific portfolio in an automated trading or analytics pipeline
- —Agents that need on-demand portfolio composition data without managing API keys
- —Integrating portfolio data into dashboards or reporting tools via micropayment-gated access
Fit
Best for
- —Developers or agents wanting frictionless, key-free access to portfolio holdings data
- —Micropayment-based workflows on the Base network
- —Low-volume, on-demand portfolio data retrieval
Not for
- —Users who need detailed API documentation or schema guarantees before integrating
- —High-volume bulk portfolio data ingestion (no documented batch endpoint)
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/53/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of the specific portfolio 53 holdings endpoint is unclear beyond its URL path. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or JSON schema describing request parameters or response format.
- —The endpoint is hardcoded to portfolio ID 53; it is unclear whether other portfolio IDs are accessible or what this portfolio represents.
- —No request or response examples could be sourced.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/53/holdings
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/53/holdings
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs