Portfolio performance data via x402 micropayment on Base network for $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 8. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.
The specific endpoint `/api/v1/portfolios/8/performance` accepts POST requests and returns JSON. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. The platform emphasizes simplicity: no API keys, no rate limits, no commitments — just attach an x402 payment header and receive the response.
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 description of request parameters, and no example of the response payload. The endpoint path suggests it returns performance metrics for a specific portfolio (ID 8), but the exact fields, time ranges, and input parameters are unknown. The endpoint is confirmed live via a valid 402 challenge.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or reports
- —Agent-driven portfolio monitoring with micropayment access
Fit
Best for
- —Developers needing quick, keyless access to portfolio performance data
- —AI agents that can settle x402 payments on Base
- —Users who want pay-per-call pricing without subscriptions
Not for
- —Users needing detailed API documentation or schema before integrating
- —Bulk historical portfolio data retrieval (no evidence of batch support)
- —Non-crypto users who cannot settle USDC payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/8/performance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"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 documentation of request/response fields, no examples, and the docs pages are empty. The endpoint path and description are the only clues to functionality.
Warnings
- —No API documentation available — docs, pricing, and README pages all return only a wallet-connect prompt
- —No OpenAPI or input/output schema provided; request parameters and response format are unknown
- —The endpoint targets a hardcoded portfolio ID (8); unclear if other portfolio IDs are available or how they are discovered
- —Platform appears to be a generic multi-category API host; the actual data source and reliability are unverified
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/8/performance
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/8/performance