x402basequality 0.35

Query ZRX token wallet balances via x402 micropayment on Base for $0.02/request.

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

What it does

This endpoint at lowpaymentfee.com returns the balance of a ZRX (0x Protocol) wallet. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network.

The specific endpoint `/api/v1/wallet/ZRX/balance` accepts POST requests and is gated behind an x402 challenge. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.

Documentation is extremely sparse. The provider's landing page lists many endpoints at uniform $0.02 pricing, but the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The actual response format for a wallet balance query is unknown and must be inferred.

Capabilities

wallet-balancezrx-tokenx402-paymentusdc-settlementbase-networkpay-per-requestno-api-key

Use cases

  • —Checking the ZRX token balance of a specific wallet address
  • —Building portfolio trackers that need on-demand balance lookups
  • —Automating balance monitoring for 0x Protocol tokens
  • —Agent-driven crypto wallet inspection without API key management

Fit

Best for

  • —Agents or apps needing one-off ZRX balance checks without subscription overhead
  • —Developers who prefer pay-per-call crypto data access on Base
  • —Workflows that already settle micropayments in USDC on Base

Not for

  • —High-frequency balance polling where per-request fees add up quickly
  • —Users who need balances for many tokens in a single call (this endpoint is ZRX-specific)
  • —Anyone requiring detailed documentation or guaranteed SLAs before integration

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/wallet/ZRX/balance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{"address": "0xYourWalletAddress"}'

Example

Request

{
  "address": "0x1234567890abcdef1234567890abcdef12345678"
}

Endpoint

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

Quality

0.35/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no examples, and all doc pages return only a wallet-connect prompt. The actual behavior of this endpoint is largely unknown.

Warnings

  • —No OpenAPI or schema documentation available — request and response formats are inferred/guessed
  • —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
  • —Response schema for wallet balance query is completely unknown
  • —The provider lists many diverse endpoints (AI, analytics, finance, utils) all at $0.02 — unclear if all are fully implemented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 14:36:18Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/MxCXKW
Query ZRX token wallet balances via x402 micropayment on Base for $0.02/request. — Clawmart · Clawmart