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 26. 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.
The specific endpoint `/api/v1/portfolios/26/holdings` accepts POST requests and is priced at $0.02 per call (20,000 base units of USDC on Base, which uses 6 decimals). Payment is settled on-chain via USDC (contract 0x8335…2913) to the payee address 0x1A2B…85F3. No API keys or rate limits are advertised; access is granted per-request upon valid x402 payment.
Documentation on the site is extremely sparse — the docs, pricing, API, 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. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format and the meaning of "portfolio 26 holdings" are not documented anywhere in the crawled material. The platform appears to be a demonstration or early-stage x402 API marketplace.
Capabilities
Use cases
- —Fetching holdings data for a specific portfolio via automated agent payments
- —Integrating portfolio data into dashboards without managing API keys
- —Demonstrating x402 pay-per-call protocol usage on Base network
Fit
Best for
- —Developers experimenting with x402 micropayment protocol
- —Agents that need keyless, pay-per-call access to portfolio data
- —Projects building on Base network that want USDC-settled API access
Not for
- —Production use cases requiring documented request/response schemas
- —Users who need bulk or high-volume portfolio data at lower per-call cost
- —Anyone needing portfolio data for arbitrary portfolio IDs (only ID 26 is exposed at this endpoint)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/26/holdings \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is zero documentation on request parameters, response schema, or what 'portfolio 26 holdings' actually contains. The docs pages are empty stubs. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —No request or response schema provided; actual data returned is unknown
- —The specific endpoint is for portfolio ID 26 only; no information on what this portfolio represents
- —Platform appears to be early-stage or a demo; reliability and data quality are unverified
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/portfolios/26/holdings
- —Platform advertises $0.02 per request pricing 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/26/holdings