x402basequality 0.35

Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request).

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/71/transactions

What it does

This x402-enabled endpoint at lowpaymentfee.com provides access to portfolio transaction data via a POST request to `/api/v1/portfolios/71/transactions`. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request with no API keys, rate limits, or commitments required.

Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge advertises a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint uses the "exact" payment scheme with a 300-second timeout. No OpenAPI schema or detailed documentation was found for this specific endpoint beyond the x402 challenge metadata.

The specific endpoint listed here (`/portfolios/71/transactions`) appears to be a single portfolio's transaction resource. The broader platform advertises many other endpoints across categories like sentiment analysis, text summarization, price feeds, geocoding, and more — all at the same $0.02 price point. However, documentation pages returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this endpoint remain unknown.

Capabilities

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

Use cases

  • —Fetching transaction history for a specific portfolio
  • —Integrating portfolio transaction data into dashboards or analytics pipelines
  • —Agent-driven portfolio monitoring with per-call payment

Fit

Best for

  • —Developers wanting keyless, pay-per-use portfolio transaction data
  • —AI agents that can settle x402 payments on Base
  • —Low-volume or sporadic access patterns where subscription pricing is wasteful

Not for

  • —High-volume bulk data export (no documented batch endpoints)
  • —Users who need detailed API documentation or response schema guarantees before integrating
  • —Non-crypto-native users without USDC on Base

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/71/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/71/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 OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages all returned only a 'Connect wallet' stub. The purpose of this specific endpoint (portfolios/71/transactions) is only inferable from the URL path.

Warnings

  • —No OpenAPI or request/response schema available for this endpoint
  • —Documentation pages (/docs, /pricing, /README, /api) all returned only 'Connect wallet' with no substantive content
  • —The endpoint targets a hardcoded portfolio ID (71); unclear if this is a demo or a real resource
  • —Actual response format and error handling are completely undocumented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:49:41Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/KBRdJR
Pay-per-call portfolio transactions endpoint on Base via x402 (USDC, $0.02/request). — Clawmart · Clawmart