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 42) 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, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This particular endpoint falls under the finance category and appears to return performance metrics for a portfolio. However, no detailed documentation, request schema, or response schema is available; the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content.
Because there is no OpenAPI spec, no example request/response payloads, and no documentation beyond the landing page listing, the actual fields accepted or returned by this endpoint are unknown. The x402 challenge is live and well-formed, confirming the endpoint is operational and ready to accept payments.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked portfolio
- —Integrating portfolio performance data into dashboards or agents
- —Programmatic access to portfolio returns without API key management
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data with crypto micropayments
- —Developers who want keyless, pay-per-call access to financial data
- —Base network USDC holders looking for frictionless API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Bulk/high-volume consumers who need subscription-based pricing
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/42/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation, and no example payloads. The endpoint's actual functionality can only be inferred from its URL path.
Warnings
- —No OpenAPI spec or schema available for request or response
- —Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content
- —The specific data returned by this portfolio performance endpoint is unknown
- —This endpoint targets a hardcoded portfolio ID (42); unclear if other IDs are available
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/portfolios/42/performance
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/42/performance
- —All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com