Portfolio performance data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 12) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).
The provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. The specific endpoint probed here sits under the finance category and appears to return performance metrics for a portfolio resource.
Documentation is extremely thin: 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 documentation, and no example payloads available. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual response format and required request body are unknown.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked investment portfolio
- —Integrating portfolio performance data into dashboards or agent workflows
- —On-demand portfolio analytics without subscription or API key management
Fit
Best for
- —Agents needing one-off portfolio performance lookups via crypto micropayment
- —Developers who want keyless, pay-per-use access to financial data
- —x402-compatible clients on the Base network
Not for
- —Users who need detailed API documentation or schema guarantees before integrating
- —Bulk or high-frequency portfolio data retrieval where per-call pricing adds up
- —Users without USDC on Base network or an x402-compatible payment client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/12/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty. The portfolio endpoint is not even listed on the provider's homepage catalog, making its purpose and data format entirely opaque.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content
- —No OpenAPI or schema definition for request or response payloads
- —This specific endpoint (/api/v1/portfolios/12/performance) is not listed among the provider's advertised APIs on the homepage
- —Request body format is unknown — no examples or field descriptions available
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/portfolios/12/performance
- —Payment is 20,000 base units of USDC (6 decimals = $0.02) on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/12/performance
- —Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no documentation contenthttps://lowpaymentfee.com/docs