Portfolio performance data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 36) behind an x402 paywall. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 6 decimals).
The provider site 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 sits under the finance category. No API keys are required; callers authenticate purely through the x402 payment header. The site advertises no rate limits and instant access.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional 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 portfolio performance response is unknown.
Capabilities
Use cases
- —Fetching performance metrics for a tracked portfolio
- —Integrating portfolio performance data into a dashboard or agent workflow
- —Programmatic access to portfolio returns without API key management
Fit
Best for
- —Agents or apps that need on-demand portfolio performance data with pay-per-call pricing
- —Developers who want keyless API access settled via USDC on Base
- —Lightweight integrations where $0.02/request micropayments are acceptable
Not for
- —Users needing detailed API documentation or guaranteed response schemas before integrating
- —High-volume batch analytics where per-request pricing would be costly
- —Users without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/36/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, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The portfolio endpoint path is specific (portfolio 36) with no explanation of what data it returns. Effectively a stub listing.
Warnings
- —No OpenAPI spec or schema available — request and response formats are completely unknown
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content
- —The endpoint is hardcoded to portfolio ID 36; it is unclear whether other portfolio IDs are available or what this portfolio represents
- —No examples of successful responses exist in the crawl material
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/36/performance
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/portfolios/36/performance
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/36/performance