Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides access to portfolio holdings data (specifically portfolio ID 48) through the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02), with no API keys, rate limits, or commitments required.
The provider site lowpaymentfee.com hosts a broad collection of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities — all priced at $0.02 per request. This specific endpoint falls under the finance/Web3 category and serves portfolio holdings information. However, there is no public documentation describing the request body schema, response fields, or what "portfolio 48" represents. The docs, pricing, and API pages behind the site all appear to require a wallet connection and provide no further detail.
Because the endpoint returned a valid 402 challenge with a well-formed x402 v1 payload, it is confirmed live. The output schema indicates it is discoverable and accepts HTTP POST. Beyond that, the actual data content, request parameters, and response structure are unknown.
Capabilities
Use cases
- —Retrieving holdings data for a specific portfolio via micropayment
- —Integrating portfolio data into agent workflows without API key management
- —Programmatic access to financial holdings with per-request USDC payment
Fit
Best for
- —Agents needing on-demand portfolio holdings data without subscriptions
- —Developers exploring x402 micropayment-gated finance APIs
- —Low-volume, pay-per-use access to portfolio information
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Bulk data retrieval where per-request pricing becomes expensive
- —Anyone requiring holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 48)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/48/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation for request/response schemas, no OpenAPI spec, and no explanation of what portfolio 48 contains. The docs pages are empty behind a wallet-connect gate. This is effectively a stub listing.
Warnings
- —No public documentation available — docs, pricing, and API pages all require wallet connection and show no content
- —Request body schema and response format are completely unknown
- —The endpoint is hardcoded to portfolio ID 48 with no explanation of what this portfolio represents
- —No OpenAPI or machine-readable schema provided
Citations
- —Endpoint returns 402 with x402 v1 challenge, maxAmountRequired 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/48/holdings
- —All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/48/holdings