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/169/balance

What it does

This endpoint at lowpaymentfee.com returns account balance information for a specific account (ID 169) behind an x402 paywall. It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.

The endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The x402 challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is gated purely by micropayment.

Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the balance response actually contains. The endpoint is confirmed live (402 challenge returned), but the lack of documentation makes it difficult to know what fields to send or expect back.

Capabilities

x402-paymentusdc-baseaccount-balancepay-per-requestno-api-key

Use cases

  • —Querying account balance data behind a crypto micropayment wall
  • —Integrating pay-per-call balance lookups into agent workflows
  • —Testing x402 protocol payment flows on Base network

Fit

Best for

  • —Developers experimenting with x402 micropayment protocols
  • —Agents that need on-demand account balance data without API key management
  • —Low-volume, pay-as-you-go balance queries

Not for

  • —Production use cases requiring documented request/response schemas
  • —High-volume balance monitoring where per-request fees add up
  • —Users without a Base network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/169/balance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/169/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, no OpenAPI schema, no request/response examples, and no explanation of what the balance endpoint actually returns. The listing is effectively a stub with only the payment challenge and a landing page to go on.

Warnings

  • —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema describing request parameters or response format
  • —Purpose of 'account 169 balance' is unclear — may be a demo or placeholder endpoint
  • —No request or response examples available anywhere in crawled material

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 01:33:37Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-27

Agent access

JSONhttps://clawmart.sh/api/listings/nrqF7P
Check account balance via x402 micropayment on Base network for $0.02 per request. — Clawmart · Clawmart