x402basequality 0.35

Portfolio holdings data via x402 micropayment on Base network, $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/47/holdings

What it does

This endpoint at lowpaymentfee.com returns portfolio holdings data for a specific portfolio (ID 47) behind an x402 paywall. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).

The provider lowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This specific endpoint falls under the finance category and serves portfolio holdings information. The x402 challenge is live and well-formed, returning a standard 402 Payment Required response with version 1 of the x402 protocol.

Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the holdings response contains or what parameters the POST body accepts. The endpoint is confirmed live but its actual data contract is unknown.

Capabilities

x402-paymentusdc-baseportfolio-holdingspay-per-callno-api-key

Use cases

  • —Retrieving current holdings for portfolio #47 programmatically
  • —Integrating portfolio data into dashboards or trading bots
  • —Agent-driven portfolio monitoring with micropayments

Fit

Best for

  • —Developers needing on-demand portfolio holdings without subscription commitments
  • —AI agents that can settle x402 payments on Base network
  • —Low-volume or sporadic access to portfolio data at $0.02 per call

Not for

  • —High-frequency bulk data retrieval where per-call pricing adds up
  • —Users who need detailed API documentation or guaranteed SLAs
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/47/holdings \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/47/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The actual data contract is entirely unknown, making this effectively a stub listing.

Warnings

  • —No API documentation available — docs, pricing, and README pages all return only a wallet-connect prompt
  • —No OpenAPI or JSON schema describing request parameters or response fields
  • —Portfolio ID 47 is hardcoded in the URL; unclear if other portfolio IDs are available or how they are obtained
  • —The nature and source of the holdings data is unspecified

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:36:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/gNr6tC
Portfolio holdings data via x402 micropayment on Base network, $0.02 per request. — Clawmart · Clawmart