Retrieve portfolio holdings data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns holdings data for portfolio ID 83. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind the x402 payment protocol on the Base network.
The specific endpoint `/api/v1/portfolios/83/holdings` accepts POST requests and is priced at a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is settled on-chain via the x402 "exact" scheme, meaning the caller includes an X-PAYMENT header with a signed payment proof. No API keys, rate limits, or upfront commitments are required — access is instant once payment is attached.
Documentation on the site is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data format of portfolio holdings is unknown. Callers should expect a JSON response (mimeType is application/json) but will need to experiment or contact the provider for field-level documentation.
Capabilities
Use cases
- —Fetching current holdings for a specific portfolio via micropayment
- —Integrating portfolio data into automated trading or analytics pipelines
- —Agent-driven portfolio monitoring without API key management
Fit
Best for
- —Agents or bots that need on-demand portfolio holdings without subscription overhead
- —Developers experimenting with x402 pay-per-call patterns on Base
- —Low-volume consumers who want instant access without signup
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —High-frequency bulk data consumers who would benefit from subscription pricing
- —Anyone requiring holdings for arbitrary portfolio IDs (this endpoint is fixed to portfolio 83)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/83/holdings \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of 'portfolio 83 holdings' is entirely opaque. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No request body schema or response schema provided; callers must guess the payload format
- —Endpoint is hardcoded to portfolio ID 83 with no explanation of what this portfolio represents
- —The broader platform lists many endpoints but none have documented schemas
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/83/holdings
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/83/holdings
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs