x402basequality 0.35

Pay-per-call portfolio transactions API on Base network via x402 protocol at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/8/transactions

What it does

This endpoint at lowpaymentfee.com provides access to portfolio transaction data (portfolio ID 8) via the x402 payment protocol. It accepts POST requests and charges $0.02 per call, settled in USDC on the Base network. No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header.

The endpoint is part of a broader platform offering multiple API categories including data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request. The specific functionality of the `/portfolios/8/transactions` endpoint is not well-documented beyond its title "Premium API Access," but the path structure suggests it returns or creates transaction records for a specific portfolio.

Payment is made in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The x402 challenge is live and responds correctly with version 1 of the protocol. No OpenAPI schema, detailed documentation, or example responses are available from the crawled pages.

Capabilities

x402-paymentusdc-settlementbase-networkportfolio-transactionspay-per-requestno-api-keypost-endpoint

Use cases

  • —Retrieving or creating transaction records for a specific portfolio
  • —Integrating pay-per-call financial data into agent workflows
  • —Accessing portfolio data without managing API keys or subscriptions

Fit

Best for

  • —Agents needing on-demand portfolio transaction data without subscription overhead
  • —Developers experimenting with x402 payment protocol integrations
  • —Low-volume consumers who prefer per-request pricing

Not for

  • —High-volume bulk transaction data retrieval (no documented batch endpoints)
  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Non-crypto-native consumers who cannot settle payments in USDC on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/8/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/8/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear, but there is no documentation on request/response schemas, no OpenAPI spec, and the crawled docs/pricing/API pages only show a wallet connect prompt. The actual functionality of this specific endpoint is unclear beyond its URL path.

Warnings

  • —No OpenAPI or request/response schema available
  • —Documentation pages return only 'Connect wallet' with no useful content
  • —Exact functionality of /portfolios/8/transactions is undocumented — path suggests portfolio-specific transaction data but details are unknown
  • —Platform appears to be a generic demo or placeholder with many endpoints all at the same price

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 09:00:34Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/dSjRn6
Pay-per-call portfolio transactions API on Base network via x402 protocol at $0.02/request. — Clawmart · Clawmart