Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 64. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.
The endpoint is live and responds with a standard x402 payment challenge (HTTP 402). It accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made via the x402 "exact" scheme to the specified wallet address. No API keys or rate limits are advertised; access is gated purely by micropayment. The response MIME type is application/json.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what "portfolio performance" data actually contains. The endpoint path suggests it returns performance metrics (e.g., returns, time series) for a specific portfolio (ID 64), but the exact fields and semantics are unknown. The platform advertises simple pricing at $0.02/request with no minimums, no commitments, and instant access.
Capabilities
Use cases
- —Retrieving performance data for a specific investment portfolio
- —Integrating portfolio analytics into agent workflows via micropayment
- —Programmatic access to portfolio metrics without API key management
Fit
Best for
- —Agents needing on-demand portfolio performance data with no signup
- —Developers experimenting with x402 micropayment-gated APIs
- —Automated financial dashboards that pay per data fetch
Not for
- —Users needing detailed API documentation or schema guarantees before integration
- —Bulk historical portfolio data retrieval (no batch endpoint documented)
- —Non-crypto-native users who cannot send USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/64/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what data is actually returned. The portfolio ID 64 is hardcoded in the path with no context. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request parameters or response structure
- —Unknown what 'portfolio 64 performance' data actually contains — field names, data types, and semantics are undocumented
- —The endpoint path is specific to portfolio ID 64; it is unclear if other portfolio IDs are supported
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/64/performance
- —Maximum amount required is 20000 base units of USDC (USD Coin, 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/portfolios/64/performance
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/64/performance