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/19/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/19/balance` is described as "Premium API Access" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20,000 base units with USDC's 6 decimals = $0.02).

lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text 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. Payments use the x402 "exact" scheme on the Base L2 network.

Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data returned after payment is unknown.

Capabilities

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

Use cases

  • —Querying account balance data behind a per-call USDC paywall
  • —Programmatic access to financial account information without API key management
  • —Agent-driven balance lookups settled on Base L2

Fit

Best for

  • —Developers wanting keyless, pay-per-call API access
  • —AI agents that can settle x402 payments in USDC on Base
  • —Users who prefer no-commitment, no-rate-limit API consumption

Not for

  • —Users needing detailed API documentation or response schemas before purchasing
  • —High-volume batch queries where per-call pricing may add up
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/19/balance \
  -H "X-PAYMENT: <x402-payment-token>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/19/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (account 19 balance) is unclear beyond the generic 'Premium API Access' label.

Warnings

  • —No API documentation available; docs/pricing/README pages all render only 'Connect wallet'
  • —No OpenAPI or output schema provided — response format after payment is unknown
  • —The specific meaning of 'accounts/19/balance' is undocumented; it is unclear what account or balance is being queried
  • —No request body schema documented for the POST method

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 00:21:35Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-29

Agent access

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