{"id":"f76124ae-7f98-47fe-a076-48bb777e728b","shortId":"PgSV52","kind":"x402","title":"Check BTC wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Check BTC wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns BTC wallet balance data, gated behind an x402 payment challenge. The endpoint accepts POST requests and charges $0.02 per call (20,000 base units of USDC on Base network, where USDC uses 6 decimals). Payment is settled on-chain via the x402 \"exact\" scheme to a specified payee address, with no API keys or rate limits required.\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request. This specific endpoint falls under the Finance & Web3 category. The x402 challenge confirms the endpoint is live and returns application/json responses. However, no detailed documentation, request/response schemas, or example payloads are available from the crawled pages (docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content).","tags":[],"capabilities":["btc-wallet-balance","x402-payment","usdc-base-settlement","per-request-pricing","no-api-key","crypto-data"],"categories":["finance","crypto"],"synonyms":["bitcoin balance API","BTC address balance","wallet balance lookup","bitcoin wallet query","crypto balance check","blockchain balance API"],"warnings":["No request or response schema available — input format and output fields are unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content","The endpoint's actual data source and accuracy for BTC balances are unverified","Provider hosts many endpoints across diverse categories; unclear if all are fully implemented or stubs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/BTC/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/BTC/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing, network, and asset details. However, there is no documentation, no request/response schema, no examples, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The actual behavior of the endpoint (what input it expects, what fields it returns) is entirely 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'000':53 '20':52 '6':64 'BTC address balance' 'accept':44 'address':81 'ai/ml':105 'analyt':104 'api':84,101,156 'application/json':136 'avail':148 'balanc':4,17,34 'base':9,22,54,59 'behind':37 'bitcoin balance API' 'bitcoin wallet query' 'blockchain balance API' 'broad':95 'btc':2,15,32 'btc-wallet-balance' 'call':51 'catalog':96 'categori':125 'chain':71 'challeng':41,128 'charg':48 'check':1,14 'confirm':129 'connect':162 'content':168 'crawl':151 'crypto balance check' 'crypto-data' 'data':35,103 'decim':65 'detail':140 'doc':153 'document':141 'endpoint':28,43,119,131 'exact':75 'exampl':145 'fall':120 'financ':123 'finance/web3':107 'gate':36,100 'host':93 'howev':138 'infer':106 'infrastructur':109 'key':85 'limit':88 'live':133 'lowpaymentfee.com':30,92 'micropay':7,20 'network':60 'no-api-key' 'on-chain':69 'page':152,157 'paye':80 'payload':146 'payment':40,66 'per':12,25,50,115 'per-request-pricing' 'post':45 'price':112,154 'prompt':164 'provid':91 'rate':87 'render':159 'request':13,26,46,116 'request/response':142 'requir':89 'respons':137 'return':31,135 'schema':143 'scheme':76 'settl':68 'span':102 'specif':118 'specifi':79 'unit':55 'usdc':57,62 'usdc-base-settlement' 'use':63 'util':110 'via':5,18,72 'wallet':3,16,33,163 'wallet balance lookup' 'web3':124 'x402':6,19,39,74,99,127 'x402-gated':98 'x402-payment'","prices":[{"id":"178fccab-abd3-4a08-abec-b4c4aea5e227","listingId":"f76124ae-7f98-47fe-a076-48bb777e728b","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/BTC/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":"2026-04-18T19:28:04.473Z"}],"sources":[{"listingId":"f76124ae-7f98-47fe-a076-48bb777e728b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/BTC/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:04.473Z","lastSeenAt":"2026-04-23T16:03:03.785Z"}],"details":{"listingId":"f76124ae-7f98-47fe-a076-48bb777e728b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/BTC/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"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, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/wallet/BTC/balance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/BTC/balance"}],"useCases":["Querying BTC wallet balances programmatically from an agent or application","Building portfolio trackers that need on-demand Bitcoin balance lookups","Integrating BTC balance checks into payment verification workflows"],"bestFor":["Agents needing pay-per-call BTC balance data without API key management","Low-volume or sporadic Bitcoin balance queries where subscription pricing is wasteful","x402-native applications settling micropayments on Base"],"notFor":["High-frequency bulk balance queries where $0.02/call adds up quickly","Users who need detailed BTC transaction history or UTXO-level data (not evidenced here)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.268Z"},"updatedAt":"2026-04-23T16:03:03.785Z"}}