Portfolio performance data via x402 micropayment on Base network for $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides portfolio performance data accessible via the x402 payment protocol. The specific resource `/api/v1/portfolios/10/performance` returns JSON data related to portfolio #10's performance metrics. 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).
The endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced uniformly at $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments; access is gated entirely by x402 micropayments.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the portfolio performance response contains. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual data schema and capabilities must be inferred from the endpoint path alone.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into automated trading or reporting agents
- —Paying per-call for financial data without subscription commitments
Fit
Best for
- —Agents needing on-demand portfolio performance data without API key management
- —Developers prototyping financial dashboards with low-cost pay-per-call access
- —x402-compatible clients on the Base network
Not for
- —Users needing detailed API documentation or response schema guarantees before integration
- —Bulk historical portfolio data retrieval (no evidence of batch endpoints)
- —Non-crypto-native users who cannot settle payments on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/10/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The actual data returned is unknown beyond what the URL path implies.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —No request or response schema provided; data format is entirely unknown
- —Only portfolio ID 10 is referenced; unclear if other portfolio IDs are supported or what they represent
- —Platform appears to be a generic multi-category API host; quality and reliability of underlying data sources is unverified
Citations
- —Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/10/performance
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/10/performance