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 66) 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 uniformly at $0.02 per call. No API keys or rate limits are advertised; access is granted instantly upon valid x402 payment. However, documentation is extremely thin: the docs, API, pricing, 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 from the crawled material.
Because this specific endpoint path references "portfolios/66/performance," it likely returns performance metrics (e.g., returns, time-series values) for a particular investment portfolio, but the exact response schema is unknown. The endpoint is confirmed live — it returns a proper 402 challenge with x402 version 1 headers. Agents should send a POST with an X-PAYMENT header containing a valid x402 payment proof to receive the data.
Capabilities
Use cases
- —Retrieving performance metrics for a tracked investment portfolio
- —Integrating portfolio return data into dashboards or agent workflows
- —Paying per-request for financial data without subscription commitments
Fit
Best for
- —Agents needing on-demand portfolio performance data with no subscription
- —Developers building x402-native financial data pipelines on Base
- —Low-volume or sporadic access to portfolio analytics at $0.02/call
Not for
- —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
- —Users who need detailed API documentation or response schema before integrating
- —Accessing portfolios other than ID 66 (only this specific resource is confirmed)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/66/performance \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge, but there is no OpenAPI spec, no request/response schema, no example payloads, and all documentation pages render only 'Connect wallet'. The purpose of the endpoint can only be inferred from the URL path. Pricing is clear at $0.02/request.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No request or response schema provided; the exact data returned is unknown
- —Only portfolio ID 66 is referenced; it is unclear whether other portfolio IDs are valid
- —The provider hosts many endpoints but none have documented schemas in the crawled material
Citations
- —Endpoint returns 402 with x402 version 1 challenge, maxAmountRequired 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/66/performance
- —All APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/66/performance