x402basequality 0.35

Check USDC wallet balances on Base via pay-per-call x402 endpoint.

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

What it does

This endpoint at lowpaymentfee.com provides a USDC wallet balance lookup accessible through the x402 payment protocol. The specific endpoint `/api/v1/wallet/USDC/balance` accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.

The provider operates a broader platform offering multiple API categories including data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what parameters this balance endpoint accepts or what shape the response takes. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes integration speculative.

Capabilities

usdc-balance-lookupx402-paymentbase-networkpay-per-callno-api-keycrypto-wallet-query

Use cases

  • —Querying USDC balances for a wallet address on Base network
  • —Automated portfolio tracking that needs on-demand balance checks
  • —Agent-driven workflows that need to verify USDC holdings before executing transactions

Fit

Best for

  • —Agents needing quick USDC balance lookups without API key management
  • —Pay-per-use crypto balance queries on Base
  • —Lightweight wallet monitoring without running a full node

Not for

  • —Bulk historical balance queries (no documented batch support)
  • —Multi-chain or non-USDC token balance lookups (endpoint is USDC-specific)
  • —Users who need detailed documentation or guaranteed SLAs

Quick start

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

Example

Request

{
  "address": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3"
}

Endpoint

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

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty stubs showing only 'Connect wallet'. The request example is inferred, not documented.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema definition for request parameters or response format
  • —Request body structure is entirely inferred — actual required fields are unknown
  • —Response format is unknown — example_response_json is null

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 14:34:30Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/RnfdpS
Check USDC wallet balances on Base via pay-per-call x402 endpoint. — Clawmart · Clawmart