x402basequality 0.35

Pay-per-call portfolio holdings API on Base network via x402 protocol, settled in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/portfolios/63/holdings

What it does

This endpoint at lowpaymentfee.com provides access to portfolio holdings data (portfolio ID 63) via a POST request. It uses the x402 payment protocol, requiring a per-request USDC payment on the Base network. The cost is $0.02 per request (20,000 base units of USDC with 6 decimals).

The provider operates a broader platform offering various API categories including data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all at the same $0.02/request price point. The platform advertises no API keys, no rate limits, and instant access. Payment is made via the x402 X-PAYMENT header using USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).

Documentation is extremely sparse—the docs, API, pricing, and README pages all only show a "Connect wallet" prompt with no additional technical detail. The specific response schema for this holdings endpoint is not documented, so the exact shape of the returned portfolio data is unknown. The endpoint accepts POST requests and returns application/json.

Capabilities

portfolio-holdingsx402-paymentusdc-settlementbase-networkpay-per-callno-api-key

Use cases

  • —Retrieving current holdings for portfolio #63 programmatically
  • —Integrating portfolio data into automated trading or analytics pipelines
  • —Agent-driven portfolio monitoring without API key management

Fit

Best for

  • —Agents needing on-demand portfolio holdings without subscription commitments
  • —Developers wanting frictionless pay-per-call access to financial data
  • —Crypto-native applications that can settle payments on Base L2

Not for

  • —Users needing detailed API documentation or response schema guarantees
  • —High-frequency polling where per-call costs would accumulate significantly
  • —Users without USDC on Base network or x402-compatible payment infrastructure

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/portfolios/63/holdings \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/portfolios/63/holdings
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of the request body format, response schema, or what data portfolio 63 actually contains. The docs pages are empty beyond a wallet connect prompt.

Warnings

  • —No response schema documented—returned data structure is unknown
  • —No request body schema documented—unclear what parameters POST accepts
  • —All documentation pages (docs, API, pricing, README) show only 'Connect wallet' with no content
  • —Specific portfolio (ID 63) purpose and data source are undocumented
  • —Provider legitimacy and data accuracy cannot be verified from available materials

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:45:54Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/6mpsSH
Pay-per-call portfolio holdings API on Base network via x402 protocol, settled in USDC. — Clawmart · Clawmart