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 7. It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact-payment scheme. The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request. No API keys or rate limits are advertised; access is gated purely by micropayment. The payment timeout is 300 seconds.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render 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 confirmed live (returns a proper 402 x402 challenge), but the actual data returned after payment is unknown. The platform advertises simple $0.02/request pricing across all its endpoints with no minimums or commitments.
Capabilities
Use cases
- —Retrieve holdings data for a specific portfolio via micropayment
- —Integrate portfolio data into trading bots or dashboards without API key management
- —Agent-driven portfolio analysis with per-call payment
Fit
Best for
- —Developers wanting keyless, pay-per-call access to portfolio data
- —AI agents that can settle x402 payments on Base
- —Low-volume or sporadic portfolio data lookups
Not for
- —Users needing detailed API documentation or response schema before integrating
- —High-frequency bulk data retrieval where per-call pricing adds up
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/7/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 zero documentation on request parameters, response schema, or what 'portfolio 7 holdings' actually contains. Docs pages are empty. This is effectively a stub listing.
Warnings
- —No API documentation available — all doc pages render only 'Connect wallet' with no content
- —No request body schema or response schema documented; unknown what data is returned after payment
- —The specific endpoint is for portfolio ID 7 only; unclear if other portfolio IDs are available or what they represent
- —No examples of successful responses exist in the crawl material
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/7/holdings
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/7/holdings
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs