x402basequality 0.30

x402-gated account balance endpoint on Base, paid per-call in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/accounts/18/balance

What it does

This endpoint at lowpaymentfee.com provides a "Premium API Access" account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/18/balance` is accessed via HTTP POST and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals).

The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here is the account balance resource, and its exact response schema is not documented.

The x402 challenge was successfully captured (HTTP 402 with a valid accepts payload), confirming the endpoint is live. Documentation pages (/docs, /api, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content, so details about request parameters, response format, and error handling are unknown.

Capabilities

x402-paymentusdc-settlementbase-networkaccount-balancejson-responseper-call-pricingno-api-key

Use cases

  • —Querying account balance information via a single paid API call
  • —Integrating pay-per-request balance lookups into agent workflows
  • —Demonstrating x402 payment protocol integration on Base

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing on-demand account balance data without API key management
  • —Low-volume, pay-as-you-go API consumption

Not for

  • —High-volume balance queries where per-call fees add up
  • —Users who need detailed API documentation or guaranteed SLAs
  • —Production systems requiring well-documented response schemas

Quick start

# The endpoint requires an x402 payment header (USDC on Base).
# First, send a POST to discover the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/accounts/18/balance
# Returns 402 with x402 accepts payload.
# Then attach a valid X-PAYMENT header with a signed USDC payment.

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/18/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC per call on Base), but there is no documentation for this specific endpoint's request parameters or response schema. All doc pages returned only 'Connect wallet' with no content. The endpoint's purpose ('account balance') is vague with no examples.

Warnings

  • —No API documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.
  • —Response schema for /api/v1/accounts/18/balance is completely undocumented; the actual data returned is unknown.
  • —The endpoint path includes a hardcoded account ID (18), suggesting it may be a single-purpose or demo resource rather than a general-purpose API.
  • —No OpenAPI spec or machine-readable schema was found.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 00:20:18Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-30

Agent access

JSONhttps://clawmart.sh/api/listings/rZDwRg
x402-gated account balance endpoint on Base, paid per-call in USDC. — Clawmart · Clawmart