Portfolio performance data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 54. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories. The endpoint uses the x402 payment protocol, settling in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific endpoint path (`/api/v1/portfolios/54/performance`) suggests it returns performance metrics for a particular portfolio — likely time-series returns, gains/losses, or similar financial analytics. However, no response schema or example output is documented in the crawled material. The endpoint accepts POST requests and returns application/json. The x402 challenge was successfully captured, confirming the endpoint is live.
The provider's landing page lists a wide catalog of endpoints (analytics, AI, finance, crypto, utilities) all priced at $0.02 per request. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no substantive content, so details about request parameters, response format, and portfolio data semantics remain unknown.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or reporting tools
- —Agent-driven financial analysis workflows that pay per query
Fit
Best for
- —Developers needing on-demand portfolio performance data without subscriptions
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring low-cost, keyless access to financial data
Not for
- —Users who need bulk historical portfolio data at scale (no documented batch endpoint)
- —Anyone without a Base-compatible USDC wallet for x402 payments
- —Use cases requiring detailed documentation or guaranteed SLAs (docs are sparse)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/54/performance \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and documentation pages are empty stubs. The endpoint path implies portfolio performance data but specifics are entirely undocumented.
Warnings
- —No documentation available — all doc pages return only a 'Connect wallet' prompt with no content
- —No request parameters or response schema documented; endpoint behavior must be discovered empirically
- —The specific portfolio ID (54) is hardcoded in the path — unclear if other portfolio IDs are available or how they are obtained
- —Provider site appears to be a generic x402 API storefront; the actual data sources and reliability are unknown
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/portfolios/54/performance
- —maxAmountRequired is 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/54/performance
- —All APIs priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/54/performance