x402basequality 0.35

Query QNT wallet balance via x402 micropayment on Base for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/wallet/QNT/balance

What it does

This endpoint at lowpaymentfee.com returns the wallet balance for QNT (Quant) tokens. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all gated via the x402 payment protocol. The endpoint accepts POST requests and charges $0.02 per call, settled in USDC on the Base network. No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The provider's landing page advertises a wide catalog spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all at a flat $0.02 per request. This specific endpoint (`/api/v1/wallet/QNT/balance`) falls under the Finance & Web3 category. The x402 challenge confirms the endpoint is live, returning a 402 with an "exact" payment scheme requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) paid to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base.

Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all resolve to a "Connect wallet" stub with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact data returned (e.g., which chain's QNT balance, what fields are included) is unknown and must be discovered by making a paid call.

Capabilities

wallet-balance-queryqnt-tokenx402-paymentusdc-settlementbase-networkpay-per-requestno-api-key

Use cases

  • —Checking QNT token balance for a given wallet address
  • —Monitoring Quant holdings programmatically
  • —Building portfolio dashboards that need QNT balance data
  • —Agent-driven wallet balance verification before executing trades

Fit

Best for

  • —Developers needing quick, keyless QNT balance lookups
  • —AI agents that can settle x402 micropayments on Base
  • —Applications requiring on-demand crypto balance checks without subscription overhead

Not for

  • —Bulk or high-frequency balance polling (no documented rate limits but $0.02/call adds up)
  • —Users who need detailed transaction history or multi-token balance in a single call
  • —Anyone without a Base-compatible USDC wallet for payment

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/wallet/QNT/balance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>" \
  -d '{"address": "0xYourWalletAddress"}'

Example

Request

{
  "address": "0x1234567890abcdef1234567890abcdef12345678"
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/wallet/QNT/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no response schema, and no example responses. The actual behavior of this endpoint is almost entirely unknown.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' stub
  • —No OpenAPI or output schema provided; response format is unknown
  • —Example request body is inferred (address field) and may not be accurate
  • —The broader lowpaymentfee.com catalog lists many endpoints but none have documented schemas

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 14:33:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/DW3tYX
Query QNT wallet balance via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart