x402basequality 0.30

x402-gated account balance endpoint on Base, pay-per-call with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/accounts/181/balance

What it does

This endpoint at lowpaymentfee.com provides an account balance lookup (account ID 181) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).

The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI/ML (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 no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here (/api/v1/accounts/181/balance) is not among those advertised on the landing page, and its exact response schema is undocumented.

The probe confirmed the endpoint is live, returning a proper 402 challenge with x402 version 1. Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response format for this endpoint remains unknown beyond what the x402 challenge reveals (POST, application/json output).

Capabilities

x402-paymentusdc-settlementbase-networkaccount-balancepay-per-requestno-api-key

Use cases

  • —Querying account balance information for account 181 via a single paid API call
  • —Demonstrating x402 payment protocol integration with USDC on Base
  • —Agent-driven balance lookups without pre-registration or API keys

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing keyless, pay-per-call balance queries
  • —Projects already using USDC on Base network

Not for

  • —Production use requiring documented request/response schemas
  • —Bulk or high-volume balance queries where per-call fees add up
  • —Users who need detailed API documentation before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/181/balance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/181/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is no documentation for the request body, response schema, or what 'account 181 balance' actually represents. The docs, pricing, API, and README pages are all empty beyond a wallet connect prompt. The specific endpoint path is not listed among the platform's advertised APIs.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README pages all return only 'Connect wallet' with no content
  • —The endpoint /api/v1/accounts/181/balance is not listed among the platform's advertised API endpoints
  • —Request body schema and response schema are completely unknown
  • —Purpose of 'account 181 balance' is unclear — could be a demo or placeholder endpoint

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 01:38:16Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/dG3Qd3