Portfolio holdings data via x402 micropayment on Base (USDC, $0.02/request).
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 65. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities — all priced at $0.02 per request and settled via the x402 protocol using USDC on the Base network.
The specific endpoint `/api/v1/portfolios/65/holdings` accepts POST requests and is gated behind an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is instant upon payment.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains. The endpoint is live (returns a proper 402 challenge), but the lack of documentation means callers must discover the request format and response shape experimentally.
Capabilities
Use cases
- —Retrieve holdings data for a specific portfolio via a single micropayment
- —Integrate portfolio data into automated trading or analytics pipelines
- —Agent-driven portfolio monitoring without API key management
Fit
Best for
- —Developers wanting keyless, pay-per-call access to portfolio data
- —AI agents that can settle x402 payments on Base
- —Quick one-off portfolio lookups without subscription commitments
Not for
- —Users needing detailed API documentation or response schema guarantees before integrating
- —Bulk or high-frequency data retrieval where per-request pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/65/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs ('Connect wallet'). The purpose of portfolio 65 specifically is unexplained. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.
- —No request body schema or response schema provided; callers must guess the expected input and output format.
- —The endpoint is hardcoded to portfolio ID 65 with no explanation of what this portfolio represents.
- —No OpenAPI spec or ai-plugin manifest found.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/65/holdings
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/65/holdings