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 at `/api/v1/portfolios/64/transactions`. It accepts POST requests and is paid per-call using USDC on the Base network. The x402 challenge confirms the endpoint is live, advertising a max cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required — payment is handled entirely through the x402 protocol's X-PAYMENT header.
The broader lowpaymentfee.com platform hosts a variety of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and utility/infrastructure services. All endpoints on the platform are uniformly priced at $0.02 per request and settle on the Base network in USDC. However, this specific listing covers only the `/api/v1/portfolios/64/transactions` endpoint.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint's purpose — retrieving or creating transactions for portfolio ID 64 — can only be inferred from the URL path. Prospective callers should expect to experiment or contact the provider for details on the expected POST body and response format.
Capabilities
Use cases
- —Fetching or creating transaction records for a specific portfolio
- —Integrating portfolio transaction data into automated trading or analytics pipelines
- —Agent-driven portfolio management workflows that pay per API call with USDC
Fit
Best for
- —Developers wanting keyless, pay-per-call access to portfolio transaction data
- —AI agents that can settle x402 payments on Base in USDC
- —Users who prefer no subscription commitments and micro-transaction pricing
Not for
- —Users needing detailed API documentation or schema before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-USDC or non-Base-network payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/portfolios/64/transactions \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint is only inferable from the URL path. This is effectively a stub listing.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —No OpenAPI or JSON schema for request or response bodies
- —The endpoint path references a hardcoded portfolio ID (64); unclear if this is a demo or production resource
- —No information on what POST body fields are expected or what the response contains
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/portfolios/64/transactions
- —All endpoints 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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/portfolios/64/transactions