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 77) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.
The endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, the specific endpoint being listed here is scoped to portfolio performance. No detailed documentation, request schema, or response schema was found in the crawl — the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Because the endpoint path includes a hardcoded portfolio ID (77), it is unclear whether this is a demo/sample portfolio or whether other portfolio IDs are available. The lack of input/output schema documentation means callers will need to experiment to determine the expected POST body and response format.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Programmatic portfolio monitoring by AI agents with micropayments
- —Integrating portfolio performance data into dashboards or reports
Fit
Best for
- —Agents needing on-demand portfolio performance data without API key management
- —Developers experimenting with x402 pay-per-call protocols
- —Low-volume, pay-as-you-go financial data retrieval
Not for
- —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
- —Users needing detailed API documentation or guaranteed response schemas
- —Bulk historical portfolio data exports
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/77/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no request/response schema, no documentation beyond a landing page, and the portfolio ID is hardcoded with no explanation. Docs pages returned only 'Connect wallet' with no content.
Warnings
- —No request or response schema documented — callers must guess the POST body format
- —Hardcoded portfolio ID 77 in the URL; unclear if other portfolios are accessible
- —All documentation pages (docs, API, pricing, README) returned no substantive content
- —No OpenAPI spec or AI plugin manifest available
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base network at 20,000 base unitshttps://lowpaymentfee.com/api/v1/portfolios/77/performance
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/77/performance