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 68) 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 data, and infrastructure utilities — all priced at $0.02 per request. 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 substantive content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure are unknown.
Capabilities
Use cases
- —Retrieve performance metrics for portfolio #68 on demand
- —Integrate portfolio performance data into trading dashboards
- —Automated agents querying portfolio returns via x402 micropayments
Fit
Best for
- —Agents that need on-demand portfolio performance data without API key management
- —Developers experimenting with x402 micropayment-gated finance APIs
- —Low-volume, pay-per-call access to portfolio analytics
Not for
- —Users needing detailed API documentation or schema guarantees before integration
- —High-frequency bulk data retrieval where per-request pricing adds up
- —Querying arbitrary portfolio IDs (this endpoint is fixed to portfolio 68)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/68/performance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and no examples. The docs pages are empty. This is effectively a stub listing with only the x402 challenge as evidence.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —Request body schema is unknown; no input parameters are documented
- —Response format is unknown; no output schema or example responses available
- —Endpoint is scoped to a single portfolio ID (68); unclear if other portfolio IDs are accessible at different paths
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/portfolios/68/performance
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/68/performance
- —All APIs on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com