x402-gated portfolio transactions endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request, gated by the x402 payment protocol. It is part of a broader platform (lowpaymentfee.com) that offers numerous pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC.
The specific endpoint `/api/v1/portfolios/26/transactions` is described generically as "Premium API Access" with no further documentation on request or response schemas. The x402 challenge confirms it is live, accepting exact-scheme payments on Base with a max amount of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The platform advertises a uniform $0.02/request pricing model with no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The exact data returned by this portfolio transactions endpoint is unknown beyond its generic title.
Capabilities
Use cases
- —Retrieving transaction history for a specific portfolio via automated agents
- —Integrating portfolio transaction data into dashboards or analytics pipelines
- —Agent-driven financial data retrieval with per-call USDC micropayments
Fit
Best for
- —Developers wanting keyless, pay-per-request portfolio transaction data
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or response schema guarantees before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/26/transactions \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a generic title, and all doc pages render only 'Connect wallet'. The purpose of this specific portfolio endpoint is unclear.
Warnings
- —No request or response schema documented — callers cannot know what to send or expect back
- —All documentation pages (docs, API, pricing, README) return only 'Connect wallet' with no content
- —The endpoint path references a specific portfolio ID (26) with no explanation of what portfolio this represents
- —No OpenAPI or ai-plugin manifest available
- —Generic 'Premium API Access' description provides no meaningful information about the endpoint's function
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals) on Base, equaling $0.02 per requesthttps://lowpaymentfee.com/api/v1/portfolios/26/transactions
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeouthttps://lowpaymentfee.com/api/v1/portfolios/26/transactions
- —Documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs