x402basequality 0.35

Check ADA 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/ADA/balance

What it does

This endpoint at lowpaymentfee.com returns Cardano (ADA) wallet balance data, gated behind an x402 payment challenge. Each call costs $0.02 (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the data.

The provider operates a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. This specific endpoint sits in the Finance & Web3 category and is focused on cryptocurrency wallet balance lookups for ADA. The response MIME type is application/json. Payment is settled on the Base L2 network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a 300-second payment timeout.

Documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a well-formed 402 challenge), but the actual response schema and required POST body are unknown.

Capabilities

ada-wallet-balancex402-paymentusdc-base-settlementpay-per-callno-api-keycrypto-balance-lookup

Use cases

  • —Checking the balance of a Cardano (ADA) wallet address programmatically
  • —Building portfolio trackers that need ADA balance data
  • —Automated monitoring of ADA wallet holdings
  • —Agent-driven crypto balance verification without API key management

Fit

Best for

  • —Developers needing quick ADA balance lookups without signup
  • —AI agents that can settle x402 micropayments on Base
  • —Applications requiring on-demand crypto balance data with no rate limits

Not for

  • —High-volume batch queries where $0.02/request adds up significantly
  • —Users who need detailed ADA transaction history or staking data (not indicated as supported)
  • —Developers without USDC on Base network for payment settlement

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/wallet/ADA/balance \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{"address": "addr1qx..."}'

Example

Request

{
  "address": "addr1qxck8mq3ms0ydqfhsqe7aqnz8wgs30t5z5gkr5s5080qlf2hcpgk"
}

Endpoint

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

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and all documentation pages are empty stubs. The request and response JSON examples are inferred/guessed, not sourced.

Warnings

  • —No OpenAPI or schema documentation available — request body format is unknown and must be guessed
  • —All doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content
  • —Response schema is completely undocumented; example_response_json is null because it cannot be inferred
  • —The provider's catalog lists many endpoints but none have detailed documentation visible in the crawl

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 14:36:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/uXmeGv
Check ADA wallet balances via x402 micropayment on Base for $0.02 per request. — Clawmart · Clawmart