{"id":"f737e646-8a87-4c66-8215-768b80689a64","shortId":"qCrtpt","kind":"x402","title":"Check XRP wallet balances via a pay-per-call x402 endpoint on Base (USDC).","tagline":"Check XRP wallet balances via a pay-per-call x402 endpoint on Base (USDC).","description":"This endpoint at lowpaymentfee.com returns XRP wallet balance data, accessed through the x402 payment protocol. Each call costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The caller includes an X-PAYMENT header with a signed USDC payment, and the server returns the balance information as JSON.\n\nThe endpoint is part of a broader suite of pay-per-request APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform share the same $0.02/request pricing model settled in USDC (contract 0x8335…2913) on Base. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nDocumentation is extremely sparse — the /docs, /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 example payloads available. The exact request body format and response structure must be discovered experimentally.","tags":[],"capabilities":["xrp-wallet-balance","x402-payment","usdc-base-settlement","pay-per-request","no-api-key","crypto-balance-lookup"],"categories":["crypto","finance"],"synonyms":["XRP balance API","Ripple wallet balance","crypto wallet balance check","XRP account balance","x402 crypto API","pay-per-call blockchain API"],"warnings":["No OpenAPI spec or schema documentation available","Request body format is entirely unknown — the example_request_json is speculative","Response format is undocumented; example_response_json set to null","All documentation pages (/docs, /pricing, /README) render only 'Connect wallet' with no content","The platform lists many diverse API categories (AI, analytics, finance, utils) all at $0.02 — actual functionality behind each endpoint is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/XRP/balance","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/XRP/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request format, response schema, or usage examples. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. Request and response JSON examples are 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'/pricing':158 '/readme':160 '/request':124 '0.02':49,123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':131 '2913':132 'Ripple wallet balance' 'XRP account balance' 'XRP balance API' 'accept':147 'access':40 'address':150 'ai/ml':108 'analyt':107 'api':57,101 'avail':187 'balanc':4,19,38,84 'base':14,29,54,134 'bodi':191 'broader':94 'call':10,25,47 'caller':67 'captur':140 'challeng':137 'check':1,16 'confirm':141 'connect':166 'contract':130 'cost':48 'crypto wallet balance check' 'crypto-balance-lookup' 'data':39,106,111 'detail':173 'discov':198 'document':152,182 'endpoint':12,27,32,89,116,143 'exact':189 'exampl':185 'experiment':199 'extrem':154 'finance/web3':110 'format':192 'header':73 'includ':68 'infer':109 'inform':85 'json':87 'key':58 'limit':61 'live':145 'lowpaymentfee.com':34,104 'model':126 'must':196 'network':55 'no-api-key' 'offer':102 'openapi':177 'page':161 'part':91 'pay':8,23,98 'pay-per-cal':7,22 'pay-per-call blockchain API' 'pay-per-request':97 'payload':186 'payment':44,72,78,148 'per':9,24,99 'platform':119 'price':125 'prompt':168 'protocol':45 'rate':60 'render':163 'request':100,190 'request/response':180 'requir':65 'respons':194 'return':35,82 'schema':181 'server':81 'servic':114 'settl':127 'share':120 'sign':76 'span':105 'spars':155 'spec':178 'structur':195 'subscript':64 'success':139 'suit':95 'technic':172 'usdc':15,30,51,77,129 'usdc-base-settlement' 'util':113 'via':5,20 'wallet':3,18,37,167 'x':71 'x-payment':70 'x402':11,26,43,136 'x402 crypto API' 'x402-payment' 'xrp':2,17,36 'xrp-wallet-balance'","prices":[{"id":"0114a68a-598d-488b-b162-6e2b592a3aa8","listingId":"f737e646-8a87-4c66-8215-768b80689a64","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/XRP/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:37.993Z"}],"sources":[{"listingId":"f737e646-8a87-4c66-8215-768b80689a64","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/XRP/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:37.993Z","lastSeenAt":"2026-04-23T09:31:50.798Z"}],"details":{"listingId":"f737e646-8a87-4c66-8215-768b80689a64","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/XRP/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"address\": \"rN7...yourXRPaddress\"}'","exampleRequest":{"address":"rN7nMnAbSgPBfRFhMQB1GpJcEq3DTMeHGY"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/XRP/balance"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/XRP/balance"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/wallet/XRP/balance"}],"useCases":["Querying XRP wallet balances programmatically without API key management","Integrating XRP balance checks into autonomous agent workflows that can pay per call","Building portfolio trackers or dashboards that need on-demand XRP balance data"],"bestFor":["Agents or bots that need keyless, on-demand XRP balance lookups","Developers who prefer pay-per-request pricing over subscription models","x402-compatible clients on the Base network"],"notFor":["High-volume balance monitoring where $0.02/request adds up quickly","Users who need detailed XRP transaction history or ledger data beyond balances","Anyone without a Base-network USDC wallet to settle payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.7Z"},"updatedAt":"2026-04-23T09:31:50.798Z"}}