Portfolio performance data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 78. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories. The endpoint uses the x402 payment protocol, settling in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific endpoint `/api/v1/portfolios/78/performance` is not listed on the provider's landing page among the advertised API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), which suggests it may be a specialized or less-documented route. The response format is application/json, and the endpoint accepts POST requests. No request body schema or response schema documentation was found in the crawl material, so the exact input parameters and output fields are unknown.
The endpoint is confirmed live: the probe received a proper 402 challenge with x402 version 1, advertising USDC (contract 0x8335…2913) on Base. The payment timeout is 300 seconds. The broader site appears to host many similarly priced endpoints, all at $0.02 per request.
Capabilities
Use cases
- —Retrieving performance metrics for a specific investment portfolio
- —Integrating portfolio performance data into dashboards or reporting tools
- —Agent-driven portfolio monitoring with per-call micropayments
Fit
Best for
- —Developers needing on-demand portfolio performance data without subscriptions
- —AI agents that can settle x402 payments on Base
- —Low-volume or sporadic access to portfolio analytics
Not for
- —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
- —Users who need detailed API documentation or request/response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/78/performance \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no request/response schema, no documentation for this specific endpoint, and the portfolio endpoint is not listed among the provider's advertised APIs. The crawled docs/pricing/API pages returned only 'Connect wallet' with no useful content.
Warnings
- —No request body schema or response schema documented for this endpoint
- —This specific endpoint (/api/v1/portfolios/78/performance) is not listed among the provider's advertised APIs on the landing page
- —Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'
- —The endpoint is hardcoded to portfolio ID 78; unclear if other portfolio IDs are supported
Citations
- —The endpoint returns a 402 challenge with x402 version 1, accepting USDC on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/portfolios/78/performance
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/78/performance