Portfolio performance data via x402 micropayment on Base network, $0.02/request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 69) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML, finance/Web3, and infrastructure APIs, all priced at $0.02 per request and settled in USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) on Base. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.
The specific portfolio endpoint (`/api/v1/portfolios/69/performance`) likely returns performance metrics for a tracked portfolio, though the exact response schema is not documented. The platform's docs, pricing, and API pages are behind a wallet-connect gate and provide no additional detail. Because there is no OpenAPI spec, no response schema, and no example payloads, the precise fields and semantics of the response remain unknown.
Capabilities
Use cases
- —Retrieve performance data for a tracked portfolio on demand
- —Integrate portfolio analytics into an agent workflow without API key management
- —Pay-per-call portfolio monitoring from automated trading bots
Fit
Best for
- —Agents or bots that need on-demand portfolio performance data without subscriptions
- —Developers prototyping x402 micropayment integrations on Base
- —Scenarios where keyless, pay-per-request access is preferred
Not for
- —Users who need detailed documentation or guaranteed response schemas before integrating
- —High-frequency polling where per-request costs would accumulate quickly
- —Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 69)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/69/performance \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema, no example request/response, and all documentation pages are gated behind wallet-connect with no content. The purpose of the specific portfolio 69 endpoint is only inferrable from the URL path.
Warnings
- —No OpenAPI or response schema available — response format is unknown
- —All documentation pages (docs, pricing, API, README) are behind a wallet-connect gate and returned no useful content
- —This endpoint is specific to portfolio ID 69; it is unclear whether other portfolio IDs are supported or what portfolio 69 represents
- —The platform lists many API categories but none have documented schemas
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/69/performance
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/69/performance
- —maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/portfolios/69/performance