Portfolio performance data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 51. It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact payment scheme. 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). There are no API keys, no rate limits, and no subscription commitments — each request is independently paid for at the time of the call.
The specific endpoint `/api/v1/portfolios/51/performance` is not listed on the site's main landing page among the advertised API categories, so it may be a specialized or less-documented route. No OpenAPI schema, detailed request/response documentation, or example payloads were found in the crawl. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no additional content. As a result, the exact request body format and response structure are unknown and must be discovered by the caller.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or agent workflows
- —Programmatic access to portfolio returns without API key management
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data with no subscription
- —Developers who want to pay per call using USDC on Base
- —Automated workflows that need frictionless, keyless API access
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Bulk historical portfolio analysis requiring high-volume, low-latency calls (no documented rate limits but no guarantees either)
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/51/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the specific portfolio endpoint is not listed on the site's landing page. Docs pages returned only wallet-connect prompts with no useful content.
Warnings
- —No OpenAPI or request/response schema available — callers must discover the expected POST body format
- —This specific endpoint (/api/v1/portfolios/51/performance) is not listed among the site's advertised APIs; it may be undocumented or experimental
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content
- —The hardcoded portfolio ID (51) in the URL suggests this may be a single-resource endpoint rather than a general-purpose portfolio API
Citations
- —The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/51/performance
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/portfolios/51/performance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com