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 83. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.
The endpoint is live and responds with a 402 Payment Required challenge conforming to x402 version 1. It accepts POST requests and requires an X-PAYMENT header containing a valid payment proof. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The specific endpoint path suggests it returns performance metrics for a particular portfolio (ID 83), but the exact data shape is unknown. The platform advertises no API keys, no rate limits, and instant access as features.
Capabilities
Use cases
- —Retrieving performance data for a specific investment portfolio
- —Integrating portfolio metrics into dashboards or reporting tools
- —Agent-driven portfolio monitoring with per-request micropayments
Fit
Best for
- —Agents needing on-demand portfolio performance data without API key management
- —Pay-as-you-go access to financial portfolio metrics
- —Low-cost single-request financial data retrieval
Not for
- —Bulk or high-frequency portfolio data ingestion (no documented batch endpoints)
- —Users who need detailed API documentation or response schema guarantees before integrating
- —Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 83)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/83/performance \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific data returned by this portfolio performance endpoint is entirely undocumented. The endpoint is also scoped to a single hardcoded portfolio ID (83) with no explanation of what that portfolio represents.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content.
- —No request or response schema provided; the shape of the returned portfolio performance data is unknown.
- —Endpoint is specific to portfolio ID 83 with no explanation of what this portfolio represents or whether other IDs are available.
- —Platform lists many API categories (AI, analytics, finance, infrastructure) but this specific endpoint's capabilities are unverified beyond the 402 challenge.
Citations
- —The endpoint returns a 402 challenge with x402 version 1, requiring USDC payment of 20,000 base units ($0.02) on Base network.https://lowpaymentfee.com/api/v1/portfolios/83/performance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/portfolios/83/performance