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 58. 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 data, and utility services — all gated behind the x402 payment protocol on the Base network using USDC.
The specific endpoint `/api/v1/portfolios/58/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). The x402 challenge was successfully captured, confirming the endpoint is live. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.
Documentation is extremely sparse. The crawled docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what parameters the POST body accepts. The endpoint appears to be part of a finance/Web3 category based on its URL structure, but the exact data returned (token balances, asset allocations, historical holdings, etc.) is unknown from available materials.
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 need on-demand financial holdings information
- —Applications requiring low-friction API access without subscriptions
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-volume bulk data retrieval where per-request pricing adds up
- —Anyone needing holdings for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 58)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/58/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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the endpoint is scoped to a single hardcoded portfolio ID (58) with no explanation of what data it returns or what POST body it expects.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No request body schema or response schema provided; integration requires trial and error
- —Endpoint is hardcoded to portfolio ID 58 — unclear if other portfolio IDs are accessible or what this portfolio represents
- —The broader lowpaymentfee.com platform lists many endpoints but none have documented schemas
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/58/holdings
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/58/holdings
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages return only 'Connect wallet' with no technical contenthttps://lowpaymentfee.com/docs