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 82) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 6 decimals).
The hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call. This particular endpoint falls under the finance category. The site advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual shape of the portfolio performance response is unknown.
Capabilities
Use cases
- —Retrieve performance metrics for a tracked 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 API key management
- —Developers experimenting with x402 micropayment-gated finance APIs
- —Low-volume, pay-per-call portfolio analytics
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-frequency trading or latency-sensitive applications (no SLA or rate-limit info available)
- —Users who need portfolio data for arbitrary portfolio IDs (this endpoint is scoped to portfolio 82)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/82/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_header>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint is scoped to a single portfolio ID with no explanation of what data it returns. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema for request or response bodies
- —Endpoint is hardcoded to portfolio ID 82; unclear if other portfolio IDs are available or how portfolios are created
- —No information on what 'performance' data fields are returned
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/portfolios/82/performance
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/82/performance