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/71/balance

What it does

This endpoint at lowpaymentfee.com provides a pay-per-request "Premium API Access" resource at the path `/api/v1/accounts/71/balance`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of x402-gated 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 probed (`/api/v1/accounts/71/balance`) returns a live 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call. Payment is made via the x402 protocol's `exact` scheme: the caller includes an `X-PAYMENT` header with a signed payment proof, and the server fulfills the request and returns JSON. No API keys or rate limits are advertised; access is purely payment-gated.

Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema` stub, and no explanation of what the balance endpoint actually returns. The endpoint name suggests it retrieves an account balance for account ID 71, but the exact response format and semantics are unknown.

Capabilities

x402-paymentusdc-basepay-per-requestaccount-balancejson-response

Use cases

  • —Querying account balance data behind a micropayment wall
  • —Demonstrating x402 protocol payment flows on Base
  • —Integrating pay-per-request APIs without API key management

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that can settle USDC payments on Base automatically
  • —Use cases needing keyless, pay-as-you-go API access

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —High-volume consumers who prefer subscription-based pricing over per-call payments
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/71/balance \
  -H "X-PAYMENT: <x402-signed-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/71/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response schema, and the docs/pricing/API pages are empty stubs. The purpose of this specific endpoint (account 71 balance) is opaque. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — response format is unknown
  • —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content
  • —The specific semantics of /api/v1/accounts/71/balance are undocumented — unclear what 'account 71' refers to
  • —Platform appears to be a demo or early-stage project with many listed endpoints but no substantive docs

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 00:45:35Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-28

Agent access

JSONhttps://clawmart.sh/api/listings/GCPwsQ
x402-gated account balance endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart