Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).
What it does
This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/47/transactions`. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.
Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge advertises a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 per call. The endpoint uses the "exact" payment scheme with a 300-second timeout. No OpenAPI schema, detailed documentation, or example request/response bodies were found during crawling — the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Because this specific endpoint path references a hardcoded portfolio ID (47), it is unclear whether the endpoint is meant to be used generically or is specific to a single portfolio. The lack of input/output schema documentation makes it difficult to determine what fields the POST body should contain or what the response looks like. Agents should treat this as a stub-level listing until more documentation surfaces.
Capabilities
Use cases
- —Fetching transaction records for a specific portfolio
- —Integrating portfolio transaction data into dashboards or analytics pipelines
- —Agent-driven portfolio monitoring with per-call micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-use portfolio transaction access
- —AI agents that can settle x402 payments on Base
- —Prototyping financial data integrations without subscription commitments
Not for
- —Production use requiring documented request/response schemas
- —Bulk historical transaction exports (no batch endpoint documented)
- —Users who cannot settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/47/transactions \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The hardcoded portfolio ID and absent input/output schemas make practical use highly uncertain.
Warnings
- —No OpenAPI or input/output schema available — request body format is unknown
- —All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content
- —Endpoint path contains a hardcoded portfolio ID (47); unclear if this generalizes
- —No example responses available to verify what data is returned
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network with exact scheme and 300-second timeouthttps://lowpaymentfee.com/api/v1/portfolios/47/transactions
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/portfolios/47/transactions