x402basequality 0.35

x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/11/transactions

What it does

This endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/11/transactions`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request.

Payment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge advertises a `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint uses the "exact" payment scheme with a 300-second timeout.

The specific functionality of this particular endpoint — portfolio transactions for portfolio ID 11 — is not well-documented beyond the generic "Premium API Access" label. The broader site lists many endpoints but the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a "Connect wallet" prompt with no substantive content. Without further documentation, the exact request body schema and response format remain unknown.

Capabilities

x402-paymentusdc-settlementbase-networkportfolio-transactionspost-endpointpay-per-request

Use cases

  • —Fetching transaction history for a specific portfolio via a pay-per-request model
  • —Integrating portfolio data into agent workflows that can settle payments on Base
  • —Accessing financial transaction data without needing API keys or subscriptions

Fit

Best for

  • —Agents or applications that can settle x402 payments in USDC on Base
  • —Users who want pay-per-use access to portfolio transaction data without subscriptions
  • —Developers prototyping with low-cost, keyless API access

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscription models
  • —Anyone unable to settle USDC payments on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/11/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/11/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation on request/response schemas, no OpenAPI spec, and all doc pages return only a wallet-connect prompt. The specific purpose of this portfolio transactions endpoint is unclear beyond its URL path.

Warnings

  • —No API documentation available — all doc pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no content
  • —Request body schema and response format are completely unknown
  • —The endpoint targets a specific portfolio ID (11) with no explanation of what this portfolio represents
  • —No OpenAPI or schema definition provided by the server

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:16:24Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/mauWAk
x402-gated portfolio transactions endpoint on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart