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 19. 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, accepting exact-scheme payments of up to 20,000 base units of USDC (0.02 USD) on Base. Payment is made via the X-PAYMENT header with no API keys or rate limits required. The method is POST and the response MIME type is application/json.
The specific data returned by this portfolio performance endpoint is not documented in the crawled material. The platform's landing page lists many API categories (analytics, AI, finance, infrastructure) but this particular path — `/api/v1/portfolios/19/performance` — is not listed among the advertised endpoints. It may be a specialized or unlisted route. No request body schema, response schema, or example payloads are available from the crawl. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or agent workflows
- —Paying per-request for financial data without subscriptions or API keys
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data
- —Developers who want keyless, pay-per-call financial APIs
- —x402-compatible clients on the Base network
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —Bulk or high-frequency data retrieval where per-request pricing is inefficient
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/19/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 of the request body, response schema, or what 'portfolio 19 performance' actually returns. The endpoint is not listed among the platform's advertised APIs. Docs pages are empty beyond a wallet-connect prompt.
Warnings
- —This specific endpoint (/api/v1/portfolios/19/performance) is not listed among the platform's advertised APIs — it may be unlisted or experimental.
- —No request body schema or response schema is available; callers cannot know what to send or what to expect back.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.
- —The nature of 'portfolio 19' is unknown — it is unclear whether this is user-specific, a demo, or a fixed dataset.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge accepting USDC on Base network, maxAmountRequired 20000 base units (0.02 USD).https://lowpaymentfee.com/api/v1/portfolios/19/performance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com