Portfolio holdings data via x402 micropayment on Base network for $0.02/request
What it does
This endpoint at lowpaymentfee.com returns portfolio holdings data for portfolio ID 94. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network using USDC.
The specific endpoint `/api/v1/portfolios/94/holdings` accepts POST requests and returns JSON. Payment is settled on-chain via USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted per-request upon valid x402 payment. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the payment timeout is 300 seconds.
Documentation is extremely sparse. The landing page lists many endpoints at uniform $0.02 pricing but provides no request/response schemas, parameter descriptions, or example payloads. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. The exact structure of the holdings response and what POST body (if any) is expected are unknown from available materials.
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 managing API keys
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 guaranteed SLAs
- —Bulk or high-frequency data retrieval where per-request fees add up
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/94/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and no explanation of what 'portfolio 94 holdings' actually contains. This is effectively a stub listing.
Warnings
- —No request or response schema available — POST body requirements are unknown
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The specific portfolio ID 94 is hardcoded in the URL; it is unclear whether other portfolio IDs exist or how they are discovered
- —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/94/holdings
- —Platform pricing is $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/94/holdings