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 61. 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 exact-scheme USDC payment on Base. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. The response MIME type is application/json.
The specific endpoint `/api/v1/portfolios/61/performance` is not listed on the site's main landing page, which primarily advertises analytics, AI, finance, and utility endpoints. No OpenAPI schema, detailed documentation, or example responses were found for this particular endpoint. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content. Because of the lack of documentation about what fields the portfolio performance response contains, consumers should expect to discover the response shape empirically.
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 API keys or subscriptions
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data with no signup
- —Developers who want to pay per call in USDC on Base without rate limits
- —Prototyping financial dashboards with instant API access
Not for
- —Users who need detailed API documentation or response schema before integrating
- —Bulk historical portfolio data retrieval (no evidence of batch endpoints)
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/61/performance \
-H "X-PAYMENT: <x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documentation, no example request/response, and the specific portfolio endpoint is not even listed on the provider's landing page. Effectively a stub with confirmed liveness.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The /docs, /pricing, /api, and /README pages all render only a 'Connect wallet' prompt with no useful content
- —This specific endpoint (/api/v1/portfolios/61/performance) is not listed among the provider's advertised APIs
- —Response schema is unknown — consumers must discover it empirically
- —Portfolio ID 61 is hardcoded in the URL; unclear if other portfolio IDs are supported
Citations
- —The endpoint returns a 402 challenge requiring 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/61/performance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/61/performance