Portfolio performance data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 67) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.
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 at $0.02 per request. However, the specific endpoint listed here is `/api/v1/portfolios/67/performance`, which does not appear in the site's publicly documented API catalog. Its exact response schema is not documented, so the structure of the returned portfolio performance data is unknown.
The x402 challenge was successfully captured and the endpoint is live. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The timeout for payment settlement is 300 seconds.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or analytics tools
- —Agent-driven portfolio monitoring with per-call payment
Fit
Best for
- —Developers needing on-demand portfolio performance data without subscription commitments
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring low-cost, keyless API access to financial data
Not for
- —Users who need bulk historical portfolio data at scale (no documented batch endpoint)
- —Anyone without a Base-compatible USDC wallet for payment
- —Use cases requiring detailed documentation or guaranteed SLAs (docs are sparse)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/67/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documented request/response schema, no OpenAPI spec, and the specific portfolio endpoint is not listed in the site's public API catalog. Docs pages returned only 'Connect wallet' with no useful content. Pricing is clear but the actual data returned is unknown.
Warnings
- —This specific endpoint (/api/v1/portfolios/67/performance) is not listed in the provider's public API catalog — it may be an internal or unlisted resource.
- —No request body schema or response schema is documented; the data returned is unknown.
- —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content.
- —The portfolio ID (67) is hardcoded in the URL — it is unclear whether other portfolio IDs are available or how they are discovered.
Citations
- —The endpoint returns a 402 x402 challenge with USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/portfolios/67/performance
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/67/performance
- —Platform pricing is $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com