Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides portfolio performance data for a specific portfolio (ID 34) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per call. This particular endpoint falls under the finance category and appears to return performance metrics for a pre-defined portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual shape of the response data and any required request body fields are unknown.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked portfolio
- —Integrating portfolio performance data into dashboards or agents
- —Automated portfolio monitoring with per-request micropayments
Fit
Best for
- —Agents or apps needing on-demand portfolio performance data without subscription commitments
- —Developers experimenting with x402 micropayment-gated APIs
- —Low-volume consumers who prefer pay-per-call pricing
Not for
- —Users needing detailed API documentation or schema guarantees before integration
- —High-frequency bulk data consumers who need negotiated pricing or rate guarantees
- —Anyone requiring portfolio customization — this endpoint is fixed to portfolio ID 34
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/34/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"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 OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of the endpoint (portfolio 34 performance) is only inferable from the URL path and generic description.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema for request or response bodies
- —The endpoint is hardcoded to portfolio ID 34 with no explanation of what this portfolio contains
- —No examples of successful responses exist in the crawl material
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/portfolios/34/performance
- —Payment is 20,000 base units of USDC (USD Coin) on Base network, equaling $0.02https://lowpaymentfee.com/api/v1/portfolios/34/performance
- —All APIs on lowpaymentfee.com are priced at $0.02 per request with no API keys or rate limitshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/34/performance