Pay-per-call portfolio holdings API on Base network via x402 protocol, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to portfolio holdings data (portfolio ID 84) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20000 base units at 6 decimals).
The provider operates a broader platform offering various pay-per-call APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access. However, this specific endpoint (/api/v1/portfolios/84/holdings) is not listed on the provider's homepage among their advertised APIs, and no documentation is available describing the request body schema or response format for portfolio holdings.
The endpoint is confirmed live, returning a valid x402 challenge (HTTP 402) with version 1 of the protocol. Without documentation on what fields the POST body expects or what the holdings response contains, consumers will need to experiment or contact the provider for integration details.
Capabilities
Use cases
- —Retrieving portfolio holdings data programmatically with per-call payment
- —Integrating portfolio position data into trading bots or dashboards
- —Accessing holdings information without API key registration
Fit
Best for
- —Agents needing on-demand portfolio data without subscription commitments
- —Developers who want to pay per request using crypto (USDC on Base)
- —Automated systems that need frictionless API access without key management
Not for
- —Users needing detailed API documentation before integration
- —High-frequency consumers who would benefit from bulk pricing
- —Users without USDC on Base network for payment
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/84/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation on request/response schemas, no OpenAPI spec, and the specific portfolio holdings endpoint is not listed among the provider's advertised APIs. The crawled docs/pricing/README pages all just show 'Connect wallet' with no useful content.
Warnings
- —No request body schema documented — unclear what POST body fields are expected
- —No response schema or example available
- —This specific endpoint (/api/v1/portfolios/84/holdings) is not listed on the provider's homepage among advertised APIs
- —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no actual content
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/84/holdings
- —Maximum amount required is 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/portfolios/84/holdings
- —Provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com