{"id":"e92e9196-17cc-4629-b86d-3c088b62155b","shortId":"9cS7mm","kind":"x402","title":"Query FTM wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Query FTM wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns Fantom (FTM) wallet balance data, accessible through the x402 payment protocol. 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.\n\nThe specific endpoint `/api/v1/wallet/FTM/balance` accepts POST requests and returns JSON. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02) to the provider's address on Base. No API keys, accounts, or rate limits are advertised — access is purely pay-per-call.\n\nDocumentation beyond the landing page is extremely sparse. The /docs, /pricing, /api, and /README pages all resolve to a minimal \"Connect wallet\" stub with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format and required input parameters are unknown.","tags":[],"capabilities":["wallet-balance-query","ftm-fantom","x402-micropayment","usdc-payment","base-network","pay-per-call","no-api-key"],"categories":["crypto","finance"],"synonyms":["FTM balance","Fantom wallet balance","crypto wallet balance API","x402 wallet API","micropayment blockchain API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' stub","No OpenAPI or JSON schema provided; request parameters and response format are unknown","The example request JSON is speculative — actual required fields are not documented","Provider offers many diverse endpoints (AI, analytics, finance, utilities) all at $0.02 — unclear if all are fully implemented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/FTM/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/FTM/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 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 body and response format are entirely 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'/api/v1/wallet/ftm/balance':94 '/docs':164 '/pricing':165 '/readme':168 '0.02':11,24,78,131 '000':127 '20':126 '402':203 'FTM balance' 'Fantom wallet balance' 'accept':95 'access':37,148 'account':142 'actual':207 'addit':180 'address':136 'advertis':147 'ai/ml':64 'analyt':63 'api':55,140 'attach':112 'balanc':4,17,35 'base':9,22,89,128,138 'base-network' 'beyond':156 'broader':48 'call':54,154 'caller':111 'challeng':204 'confirm':198 'connect':175 'crypto wallet balance API' 'data':36,62 'detail':182 'document':155 'endpoint':28,71,93,196 'exact':108 'exact-pay':107 'exampl':194 'extrem':161 'fantom':32 'finance/web3':66 'format':209 'ftm':2,15,33 'ftm-fantom' 'handl':103 'header':117 'i.e':130 'infer':65 'input':212 'json':100 'key':141 'land':158 'limit':145 'live':199 'lowpaymentfee' 'lowpaymentfee.com':30 'micropay':7,20 'micropayment blockchain API' 'minim':174 'model':83 'network':90 'no-api-key' 'offer':56 'openapi':186 'page':159,169 'paramet':213 'part':45 'pay':52,152 'pay-per-cal':51,151 'pay-per-call' 'payment':41,101,109,116,122 'per':12,25,53,80,153 'per-request':79 'platform':74 'post':96 'price':82 'proper':202 'protocol':42 'provid':60,134 'pure':150 'queri':1,14 'rate':144 'request':13,26,81,97 'request/response':189 'requir':211 'resolv':171 'respons':208 'return':31,99,200 'schema':190 'scheme':110 'servic':69 'settl':84 'share':75 'sign':120 'span':61 'spars':162 'spec':187 'specif':92 'stub':177 'suit':49 'technic':181 'uniform':77 'unit':129 'unknown':215 'usag':193 'usdc':86,121 'usdc-payment' 'util':68 'via':5,18,104 'wallet':3,16,34,176 'wallet-balance-query' 'x':115 'x-payment':114 'x402':6,19,40,106 'x402 wallet API' 'x402-micropayment'","prices":[{"id":"c34906b4-3f07-47d0-957e-aebcb060939d","listingId":"e92e9196-17cc-4629-b86d-3c088b62155b","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/FTM/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":"2026-04-18T19:28:19.667Z"}],"sources":[{"listingId":"e92e9196-17cc-4629-b86d-3c088b62155b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/FTM/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:19.667Z","lastSeenAt":"2026-04-23T12:32:03.208Z"}],"details":{"listingId":"e92e9196-17cc-4629-b86d-3c088b62155b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/FTM/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{\"address\": \"0xYourFTMWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/FTM/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 corresponds to USDC on Base","source_url":"https://lowpaymentfee.com"}],"useCases":["Checking FTM token balances for a given wallet address","Integrating Fantom balance lookups into agent workflows without API key management","Pay-per-call wallet monitoring for bots or dashboards"],"bestFor":["Agents needing on-demand FTM balance checks without subscription overhead","Developers prototyping crypto portfolio tools with minimal setup","x402-native applications that settle payments in USDC on Base"],"notFor":["High-frequency balance polling where per-call costs add up quickly","Users needing detailed transaction history or multi-token portfolio data","Anyone requiring comprehensive API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.55Z"},"updatedAt":"2026-04-23T12:32:03.208Z"}}