Portfolio performance data via x402 micropayment on Base network, $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 25) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.
The provider site (lowpaymentfee.com) hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request. This specific endpoint falls under the finance category and appears to return performance metrics for a given portfolio. However, no detailed documentation, request/response schema, or example payloads are available from the crawled pages — the docs, pricing, and API pages all render only a wallet-connect prompt with no further content.
Because the endpoint returned a valid 402 challenge with a well-formed x402 payload, it is confirmed live. The output schema indicates it is discoverable and accepts HTTP POST. Beyond that, the actual fields accepted in the request body and the structure of the performance response are unknown.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked investment portfolio
- —Integrating portfolio performance data into a dashboard or reporting tool
- —Automated agents querying portfolio returns as part of a financial workflow
Fit
Best for
- —Developers needing on-demand portfolio performance data without API key management
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring low-cost, pay-per-call financial data
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Bulk historical portfolio data downloads (no evidence of batch support)
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/25/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI schema, no request/response examples, and the documentation pages are empty (wallet-connect only). The endpoint's actual input parameters and response structure are entirely unknown, making this effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and API pages all render only a wallet-connect prompt with no content.
- —Request body schema and response schema are completely unknown; no examples exist in crawled material.
- —The specific portfolio ID (25) is hardcoded in the URL; it is unclear whether other portfolio IDs are supported or how they are created.
- —Provider site lists many endpoints across diverse categories (AI, analytics, finance, infrastructure) all at $0.02 — the breadth and uniformity may indicate a demo or placeholder service.
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/portfolios/25/performance
- —Payment is 20,000 base units of USDC (6 decimals = $0.02) on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/25/performance
- —Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Provider lists endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com