Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 82. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, 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 subscriptions are required — each request is individually paid via the X-PAYMENT header.
The specific endpoint `/api/v1/portfolios/82/holdings` falls under the finance/Web3 category of the platform, though it is not explicitly listed on the landing page among the advertised endpoints. The platform's landing page lists endpoints for price feeds, exchange rates, token quotes, gas estimates, and more, all at the same $0.02 price point. The holdings endpoint accepts POST requests and returns application/json responses. No detailed request body schema or response schema is documented in the probe or crawl material, so the exact fields required and returned are unknown.
Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 challenge confirms the endpoint is live and responding with a proper 402 payment challenge.
Capabilities
Use cases
- —Retrieving current holdings for a specific portfolio
- —Integrating portfolio data into dashboards or trading bots
- —Automated portfolio monitoring by AI agents
- —On-demand portfolio snapshots without subscription overhead
Fit
Best for
- —Agents needing one-off portfolio data lookups
- —Developers who want pay-per-call pricing without API key management
- —Crypto-native applications settling payments on Base
Not for
- —High-frequency polling where per-request costs add up quickly
- —Users who need detailed API documentation or response schema guarantees before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/82/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live with a valid x402 402 challenge, but there is no documented request body schema, no response schema, and no examples. The endpoint is not listed on the provider's landing page. Docs, pricing, and README pages all render only a 'Connect wallet' prompt with no useful content.
Warnings
- —No request body schema or response schema documented — input/output fields are unknown
- —Endpoint /api/v1/portfolios/82/holdings is not listed among the provider's advertised APIs on the landing page
- —Documentation pages (/docs, /api, /pricing, /README) contain no useful content beyond 'Connect wallet'
- —Hardcoded portfolio ID 82 in the URL — unclear if other portfolio IDs are accessible or how they are obtained
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/82/holdings
- —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/82/holdings