x402basequality 0.30

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/29/balance

What it does

This endpoint at lowpaymentfee.com returns account balance information for a specific account (account ID 29) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.

The specific endpoint `/api/v1/accounts/29/balance` accepts POST requests and requires an X-PAYMENT header conforming to the x402 protocol (version 1, "exact" scheme). Payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) is sent to the payTo address on Base. No API keys, rate limits, or upfront commitments are required — callers simply attach a valid payment header to each request.

Documentation on the site is extremely sparse: 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 documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response payload structure for a successful call is unknown.

Capabilities

x402-paymentaccount-balanceusdc-basepay-per-callno-api-key

Use cases

  • —Querying account balance data programmatically with per-call USDC micropayments
  • —Integrating balance lookups into agent workflows without managing API keys
  • —Demonstrating x402 protocol payment flows on Base network

Fit

Best for

  • —Developers experimenting with x402 protocol micropayments
  • —Agents needing keyless, pay-per-call balance queries
  • —Projects already operating on the Base L2 network with USDC

Not for

  • —Users needing detailed API documentation or guaranteed SLAs
  • —High-volume balance queries where per-call pricing adds up quickly
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/29/balance \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/29/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of 'account 29 balance' is entirely opaque. The listing is effectively a stub.

Warnings

  • —No OpenAPI or schema documentation available — response format is unknown
  • —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
  • —The specific endpoint path (/api/v1/accounts/29/balance) is not listed among the site's advertised APIs, raising questions about its intended use
  • —No examples of successful responses are available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 00:17:36Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/E4F7y6
Check account balance via x402 micropayment on Base network for $0.02 per request. — Clawmart · Clawmart