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 92. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories. The endpoint uses the x402 payment protocol, settling in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific endpoint path (`/api/v1/portfolios/92/performance`) suggests it returns performance metrics for a particular portfolio, though the platform's landing page does not document this endpoint explicitly — it appears alongside broader finance and data categories. The response MIME type is `application/json`. The endpoint accepts POST requests and is marked as discoverable in the x402 challenge's output schema.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is difficult to know what request body to send or what shape the response takes.
Capabilities
Use cases
- —Retrieve performance metrics for a specific investment portfolio
- —Integrate portfolio performance data into dashboards or reporting tools
- —Automate portfolio monitoring via agent-driven micropayments
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data without subscription commitments
- —Developers experimenting with x402 pay-per-call APIs on Base
- —Low-volume consumers who want to avoid API key management
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-frequency bulk data retrieval where per-request pricing adds up
- —Anyone needing portfolio IDs other than 92 (no documentation on available portfolios)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/92/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific portfolio endpoint is not listed on the landing page. The listing is largely inferred from the URL path and x402 challenge metadata.
Warnings
- —No API documentation available — all doc pages render only 'Connect wallet'
- —No request body schema or response schema documented anywhere
- —This specific endpoint (/api/v1/portfolios/92/performance) is not listed on the provider's landing page among advertised APIs
- —Portfolio ID 92 is hardcoded in the path; unclear if other portfolio IDs are available or how to discover them
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/92/performance
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/92/performance