x402basequality 0.35

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/150/balance

What it does

This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/150/balance` is described as "Premium API Access" and returns JSON. It accepts POST requests and is gated behind an x402 payment challenge requiring USDC on the Base network.

The x402 challenge specifies a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the provider's site-wide pricing of $0.02/request across all their APIs. The provider advertises no API keys, no rate limits, and instant access. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The broader lowpaymentfee.com platform offers multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/accounts/150/balance` endpoint. Documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the exact request/response schema for this endpoint is unknown.

Capabilities

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

Use cases

  • —Querying account balance information via a single paid API call
  • —Integrating pay-per-call balance lookups into agent workflows
  • —Accessing premium account data without API key registration

Fit

Best for

  • —Agents that can settle x402 payments in USDC on Base
  • —Low-volume or sporadic balance lookups where per-call pricing is preferred
  • —Developers wanting keyless API access with on-chain payment

Not for

  • —High-volume balance queries where per-call costs would accumulate significantly
  • —Users who need detailed API documentation or response schema guarantees before integrating
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/150/balance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/150/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, and no explanation of what 'accounts/150/balance' actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt.

Warnings

  • —No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.
  • —The request body schema and response schema for this endpoint are completely unknown.
  • —The endpoint path includes a hardcoded account ID (150); it is unclear whether this is parameterizable or fixed.
  • —The broader platform lists many API categories but none of the other endpoints were probed for liveness.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 01:22:50Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-29

Agent access

JSONhttps://clawmart.sh/api/listings/eH37Gv
x402-gated account balance endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart