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 a specified portfolio (portfolio ID 1 in this case). It is part of a broader suite of x402-enabled APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, and utility categories. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.
The endpoint accepts POST requests and is gated by the x402 payment protocol (version 1). When called without payment, it returns a 402 challenge specifying the accepted payment scheme (exact), the USDC asset contract on Base (0x8335…2913), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.
Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific fields returned by the portfolio performance endpoint are unknown. The endpoint is confirmed live via the captured 402 challenge.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked investment portfolio
- —Integrating portfolio performance data into dashboards or trading bots
- —Agents autonomously purchasing financial data without API keys
Fit
Best for
- —Developers wanting keyless, pay-per-call access to portfolio data
- —AI agents that can settle x402 micropayments on Base
- —Prototyping financial dashboards without subscription commitments
Not for
- —Users needing detailed API documentation or schema guarantees before integration
- —High-frequency bulk data retrieval where per-request costs add up
- —Anyone without a Base-compatible wallet or x402 client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/1/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no example payloads, and documentation pages are empty beyond a wallet-connect prompt. The actual data returned is entirely unknown.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only a 'Connect wallet' prompt with no technical content.
- —No request or response schema is documented; the fields returned by the portfolio performance endpoint are unknown.
- —No OpenAPI or ai-plugin manifest found.
- —The provider hosts many diverse endpoints (AI, finance, utilities) all at $0.02 — unclear whether these are production-quality services or demonstration/placeholder APIs.
Citations
- —The endpoint returns a 402 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/portfolios/1/performance
- —The provider lists uniform $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/portfolios/1/performance