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 43. 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 standard x402 payment challenge (HTTP 402) requiring an X-PAYMENT header. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base, using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The endpoint accepts POST requests and returns application/json.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no description of the response payload, and no information about what "portfolio 43" represents or what performance metrics are returned. The platform advertises no API keys, no rate limits, and instant access, but specifics about the data source, update frequency, or response format are unknown.
Capabilities
Use cases
- —Retrieving portfolio performance metrics on demand without API key registration
- —Integrating portfolio data into agent workflows that support x402 micropayments
- —Programmatic access to financial performance data settled in USDC on Base
Fit
Best for
- —Agents or bots that can settle x402 payments on Base
- —Users who want keyless, pay-per-request access to portfolio data
- —Developers building on the x402 protocol looking for low-cost endpoints
Not for
- —Users needing detailed documentation or guaranteed SLAs before integration
- —Bulk historical portfolio data retrieval (no batch or streaming support documented)
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/43/performance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no example responses, and no description of what data is actually returned. The specific endpoint (portfolios/43/performance) is not even listed on the provider's homepage. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or response schema provided; the structure of the response payload is completely unknown.
- —The specific endpoint /api/v1/portfolios/43/performance is not listed among the provider's advertised APIs on the homepage.
- —Unknown data source and update frequency for portfolio performance data.
- —Portfolio ID 43 is hardcoded in the URL; it is unclear whether other portfolio IDs are available or what this portfolio represents.
Citations
- —The endpoint returns HTTP 402 with x402 challenge requiring X-PAYMENT header, price 20000 base units USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/43/performance
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/43/performance