x402basequality 0.30

Pay-per-call portfolio transactions API on Base, settled in USDC via x402.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/41/transactions

What it does

This endpoint at lowpaymentfee.com exposes a POST-based transactions API for portfolio #41. It is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.

The specific endpoint `/api/v1/portfolios/41/transactions` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) per call, which equals $0.02. Payment is made via the x402 exact scheme with no API keys or rate limits required. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the timeout window is 300 seconds.

Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what fields the POST body should contain or what the response looks like. The endpoint name suggests it deals with portfolio transactions (possibly creating, listing, or managing them), but the exact functionality cannot be confirmed from available material.

Capabilities

x402-paymentusdc-settlementbase-networkpost-endpointjson-responseportfolio-transactionspay-per-call

Use cases

  • —Submitting or retrieving portfolio transaction records via a single pay-per-call request
  • —Integrating portfolio transaction data into automated trading or accounting workflows
  • —Agent-driven portfolio management where each API call is settled instantly in USDC

Fit

Best for

  • —Developers wanting zero-signup, pay-per-call portfolio transaction access
  • —AI agents that can settle USDC payments on Base via x402
  • —Projects needing low-cost ($0.02) per-request financial data without API keys

Not for

  • —Users who need detailed API documentation or request/response schemas before integrating
  • —Applications requiring non-crypto payment methods
  • —High-volume batch operations where per-call pricing may add up

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/41/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/41/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 spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of the endpoint (portfolio transactions) is only inferable from the URL path. This is effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI or JSON schema for request or response bodies
  • —Exact functionality of the portfolio transactions endpoint is unknown — no field definitions or examples
  • —Portfolio ID 41 is hardcoded in the URL; unclear if other portfolio IDs are available or how they are obtained

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:34:21Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/LF45xh