x402basequality 0.30

x402-payable portfolio transactions endpoint on Base, settled in USDC at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/37/transactions

What it does

This endpoint at lowpaymentfee.com provides access to portfolio transaction data via the x402 payment protocol. The specific resource `/api/v1/portfolios/37/transactions` accepts POST requests and charges per call using USDC on the Base network. Payment is handled inline via the X-PAYMENT header — no API keys or accounts are required.

The endpoint is part of a broader platform (lowpaymentfee.com) that advertises a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. The x402 challenge confirms the endpoint is live and returns a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. Settlement goes to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.

Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the portfolio transactions endpoint actually returns or what parameters it accepts. The endpoint path suggests it retrieves or creates transactions for a specific portfolio (ID 37), but this is inference only.

Capabilities

x402-paymentusdc-settlementbase-networkportfolio-transactionspay-per-requestno-api-key

Use cases

  • —Fetching or submitting portfolio transaction records via a single paid API call
  • —Integrating pay-per-request financial data into agent workflows without managing API keys
  • —Programmatic access to portfolio data settled on-chain via USDC on Base

Fit

Best for

  • —Agents or bots that need keyless, pay-per-call access to portfolio transaction data
  • —Developers experimenting with x402 payment protocol integrations
  • —Workflows requiring low-cost, on-demand financial data without subscription commitments

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscription plans
  • —Anyone needing portfolio IDs other than 37 (no evidence of parameterized portfolio access)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/37/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/37/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 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 stubs. The purpose and data model of the portfolio transactions endpoint are entirely unclear.

Warnings

  • —No documentation available — all doc pages return only 'Connect wallet' with no content
  • —No OpenAPI or JSON schema describing request parameters or response format
  • —The endpoint path is hardcoded to portfolio ID 37; unclear if other portfolio IDs are supported
  • —No information on what 'transactions' data is returned or what POST body is expected

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:31:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/6R5yVX
x402-payable portfolio transactions endpoint on Base, settled in USDC at $0.02/request. — Clawmart · Clawmart