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 75. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, 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 x402 payments. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), 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, and the endpoint accepts HTTP POST requests.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The platform advertises no API keys, no rate limits, and instant access, but specifics about the data returned by this particular endpoint are unknown.
Capabilities
Use cases
- —Retrieve performance metrics for a specific investment portfolio
- —Integrate portfolio performance data into dashboards or analytics tools
- —Automate portfolio monitoring with per-request micropayments
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data without API key management
- —Developers who want to pay per request with USDC on Base
- —Lightweight integrations that don't need subscription commitments
Not for
- —Users who need detailed API documentation or response schema before integrating
- —High-volume consumers who would prefer subscription-based pricing over per-call payments
- —Anyone needing portfolio data for IDs other than 75 (no evidence other IDs are available at this path)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/75/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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The purpose of the endpoint (portfolio 75 performance) is only inferable from the URL path and the generic 'Premium API Access' description.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'
- —No request body schema or response schema provided; consumers cannot know what fields to send or expect
- —The endpoint is specific to portfolio ID 75; it is unclear whether other portfolio IDs are supported
- —No OpenAPI or ai-plugin manifest found
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/75/performance
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/75/performance
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs