x402basequality 0.35

Query STX wallet balances via x402 micropayment on Base for $0.02 per request.

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

What it does

This endpoint at lowpaymentfee.com returns STX (Stacks) wallet balance data, gated behind an x402 payment challenge. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.

The specific endpoint `/api/v1/wallet/STX/balance` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a signed payment proof for up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a maximum timeout of 300 seconds. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.

Documentation on the site 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. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format and required request body fields are unknown.

Capabilities

wallet-balance-querystx-balancex402-paymentusdc-settlementbase-networkper-call-micropaymentjson-api

Use cases

  • —Checking STX token balances for a given wallet address
  • —Building portfolio trackers that need on-demand balance lookups
  • —Automated agents querying Stacks wallet balances without API key management
  • —Pay-per-use balance checks in trading bots or DeFi dashboards

Fit

Best for

  • —Agents or apps needing occasional STX balance lookups without subscription commitments
  • —Developers who prefer x402 micropayment access over traditional API key auth
  • —Low-volume or bursty wallet balance queries at $0.02 per call

Not for

  • —High-frequency balance polling where per-call costs would accumulate quickly
  • —Users who need detailed transaction history or full blockchain node data beyond balances
  • —Anyone without USDC on Base network to pay for requests

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/wallet/STX/balance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{"address": "SP2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKNRV9EJ7"}'

Example

Request

{
  "address": "SP2J6ZY48GV1EZ5V2V5RB9MP66SW86PYKKNRV9EJ7"
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/wallet/STX/balance
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The request and response formats are entirely inferred.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
  • —No OpenAPI or schema definition found; request body fields and response format are unknown.
  • —Example request JSON is speculative — the actual required fields are undocumented.
  • —The broader platform lists many endpoints but none appear to have public documentation.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 14:38:53Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/hdQYxB
Query STX wallet balances via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart