Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 76. It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.
The specific endpoint `/api/v1/portfolios/76/holdings` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD given 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys or rate limits are advertised; access is gated purely by micropayment.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what POST body (if any) is expected. The endpoint's purpose — returning holdings for a specific portfolio — is inferred solely from the URL path and the generic "Premium API Access" description.
Capabilities
Use cases
- —Retrieve holdings data for portfolio 76 programmatically with per-call payment
- —Integrate portfolio data into trading bots or dashboards without API key management
- —Agent-driven portfolio monitoring using x402 micropayments
Fit
Best for
- —Agents or apps needing on-demand portfolio holdings without subscription commitments
- —Developers experimenting with x402 pay-per-call protocols
- —Low-volume consumers who want to avoid API key registration
Not for
- —Users needing detailed API documentation or schema guarantees before integration
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone needing holdings for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 76)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/76/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the purpose of the endpoint is only inferable from the URL path. Effectively a stub listing.
Warnings
- —No OpenAPI schema or request/response documentation available
- —All doc/pricing/README pages return only 'Connect wallet' with no content
- —Endpoint is specific to portfolio ID 76; unclear if other portfolio IDs are supported
- —POST body requirements are unknown — no input schema provided
- —Response format and fields are completely undocumented
Citations
- —The endpoint returns a 402 challenge requiring 20,000 base units of USDC (0.02 USD) on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/76/holdings
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/76/holdings