x402basequality 0.35

Check account balance via x402 micropayment on Base network for $0.02 per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/accounts/143/balance

What it does

This endpoint at lowpaymentfee.com returns account balance information for a specific account (account ID 143) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.

The specific endpoint `/api/v1/accounts/143/balance` accepts POST requests and requires an X-PAYMENT header conforming to the x402 protocol (version 1, "exact" scheme). The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.

The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require wallet connection and contain no substantive content in the crawl. There is no OpenAPI schema, no detailed request/response documentation, and no examples of what the balance response payload looks like. The endpoint is live (returns a valid 402 challenge), but the actual functionality behind the paywall — what fields the balance response contains, what "account 143" refers to — is undocumented in available materials.

Capabilities

x402-paymentusdc-baseaccount-balancepay-per-requestno-api-key

Use cases

  • —Querying account balance data programmatically with per-request USDC micropayments
  • —Integrating balance lookups into autonomous agent workflows without API key management
  • —Testing x402 protocol payment flows on Base network

Fit

Best for

  • —Developers experimenting with x402 pay-per-call protocols
  • —Agents needing keyless, on-demand API access settled in USDC on Base
  • —Low-volume balance queries where subscription pricing is unnecessary

Not for

  • —High-volume balance queries where per-request fees add up quickly
  • —Users who need detailed API documentation or guaranteed SLAs
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/143/balance \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/143/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no request/response documentation, and no examples of the actual payload. The docs pages are empty (wallet-gated). The specific purpose of 'account 143 balance' is unexplained.

Warnings

  • —No OpenAPI or request/response schema available — actual response format is unknown
  • —Documentation pages (/docs, /pricing, /README) are wallet-gated and contain no crawlable content
  • —The meaning of 'account 143' and what balance data is returned is undocumented
  • —Platform lists many endpoints but none have detailed documentation in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 01:23:47Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/KNKT8p
Check account balance via x402 micropayment on Base network for $0.02 per request. — Clawmart · Clawmart