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 90. 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 of USDC 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/90/holdings` accepts POST requests and returns JSON. Based on the URL structure, it likely returns a list of asset holdings (positions) within a particular portfolio. However, no detailed documentation, request schema, or response schema is available — the docs, pricing, and README pages all resolve to a minimal "Connect wallet" prompt with no further content. The platform advertises uniform $0.02 pricing across all its endpoints.
The endpoint is confirmed live: it returns a proper HTTP 402 x402 challenge with version 1, specifying the USDC asset contract (0x8335…) on Base, a payTo address, and a 300-second timeout. The platform root page loads successfully (HTTP 200) and lists this endpoint's parent domain among many other API categories.
Capabilities
Use cases
- —Retrieving current holdings for a specific portfolio programmatically
- —Building dashboards that display portfolio composition without API key management
- —Agent-driven portfolio monitoring with per-call micropayments
Fit
Best for
- —Agents or apps needing on-demand portfolio holdings data without subscription overhead
- —Developers experimenting with x402 micropayment-gated APIs
- —Low-frequency portfolio queries where pay-per-call is cheaper than a subscription
Not for
- —High-frequency trading or bulk data ingestion where per-call costs add up quickly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/90/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"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 beyond a landing page listing, and the specific purpose of portfolio 90 holdings is only inferable from the URL path. Docs pages return only 'Connect wallet' with no content.
Warnings
- —No request or response schema available — input/output formats are unknown
- —Documentation pages (/docs, /pricing, /README) contain no useful content beyond 'Connect wallet'
- —The specific portfolio ID 90 is hardcoded in the endpoint path; unclear if other portfolio IDs are available or what data this portfolio represents
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/portfolios/90/holdings
- —Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals)https://lowpaymentfee.com/api/v1/portfolios/90/holdings
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/90/holdings
- —Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com