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 a specific portfolio (ID 46) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request. This particular endpoint falls under the finance category and appears to deliver portfolio performance metrics. No OpenAPI schema, detailed documentation, or example responses were found in the crawl; the docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content.
Because no request/response schema is documented beyond the x402 challenge metadata, callers will need to experiment with POST body formats. The endpoint is confirmed live (402 challenge returned successfully). There are no API keys or rate limits advertised — access is purely pay-per-call via the x402 protocol.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked investment portfolio
- —Programmatic portfolio monitoring by AI agents with crypto wallets
- —Integrating portfolio performance data into dashboards or reports
Fit
Best for
- —Agents or apps that need on-demand portfolio performance data without API key management
- —Micropayment-based access to financial data on Base network
- —Developers experimenting with x402 pay-per-call APIs
Not for
- —Users who need detailed API documentation or guaranteed schema stability
- —High-frequency bulk data retrieval where per-call pricing adds up
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/46/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI schema, no documented request/response format, no example payloads, and the docs pages are empty. The listing is effectively a stub with only the x402 challenge metadata and the landing page catalog to work from.
Warnings
- —No API documentation found — docs, pricing, and API pages all return only a 'Connect wallet' prompt with no content.
- —No request body schema or response schema documented; callers must guess the POST format.
- —Portfolio ID 46 is hardcoded in the URL; unclear if other portfolio IDs are accessible or how they are created.
- —The provider hosts many endpoints but none appear to have public documentation beyond the landing page catalog.
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/portfolios/46/performance
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/46/performance
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com