{"id":"68b5d6a4-21de-47d6-99d2-805993c89828","shortId":"F4FjGA","kind":"x402","title":"Check CFX wallet balance via x402 micropayment on Base for $0.02 per request.","tagline":"Check CFX wallet balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the balance of a Conflux (CFX) wallet. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/wallet/CFX/balance` accepts POST requests and costs $0.02 per call (20,000 base units of USDC with 6 decimals).\n\nThe provider advertises a simple pricing model: $0.02 per request across all endpoints, with no API keys, no rate limits, no minimums, and instant access. Payment is made inline via the x402 `X-PAYMENT` header. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payment on Base (asset contract 0x8335…2913, which is USDC on Base). The timeout for payment settlement is 300 seconds.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what parameters the POST body should contain or what the response looks like. The endpoint's actual behavior (input format, response schema) must be discovered by making a paid call.","tags":[],"capabilities":["wallet-balance","cfx-balance","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["crypto","finance"],"synonyms":["CFX balance","Conflux wallet balance","crypto wallet balance API","x402 wallet API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or output schema provided; request body format and response structure are unknown.","Example request JSON is inferred from the URL path pattern and is not confirmed by any documentation.","The broader site lists many endpoints across categories (AI, finance, infrastructure) all at $0.02 — unclear if all are functional or placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/CFX/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/CFX/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 pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response format, or endpoint behavior. No OpenAPI schema, no examples, and all doc pages are empty. The request and response JSON examples above are 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'0.02':11,24,76,95 '000':80 '0x8335':142 '20':79 '2913':143 '300':155 '6':86 'CFX balance' 'Conflux wallet balance' 'accept':71,136 'access':112 'across':98 'actual':208 'addit':177 'advertis':90 'api':51,103,163 'asset':140 'balanc':4,17,33 'base':9,22,63,81,139,148 'base-network' 'behavior':209 'bodi':196 'broader':44 'call':50,78,221 'captur':129 'cfx':2,15,37 'cfx-balance' 'challeng':126 'check':1,14 'confirm':130 'conflux':36 'connect':172 'contain':198 'contract':141 'cost':75 'crypto wallet balance API' 'decim':87 'descript':190 'detail':179 'discov':216 'doc':162 'document':157 'endpoint':28,69,100,132,206 'exampl':187 'extrem':159 'format':211 'header':123 'inlin':116 'input':210 'instant':111 'key':104 'like':204 'limit':107 'live':134 'look':203 'lowpaymentfee' 'lowpaymentfee.com':30,54 'made':115 'make':218 'micropay':7,20 'micropayment API' 'minimum':109 'model':94 'must':214 'network':64 'no-api-key' 'offer':52 'openapi':183 'page':167 'paid':220 'paramet':193 'part':41 'pay':48 'pay-per-cal':47 'pay-per-call' 'payment':113,122,137,152 'per':12,25,49,77,96 'post':72,195 'price':93,164 'prompt':174 'protocol':60 'provid':89 'rate':106 'readm':166 'render':169 'request':13,26,73,97 'request/response':186 'respons':202,212 'return':31 'schema':184,213 'second':156 'settl':56 'settlement':153 'simpl':92 'spars':160 'specif':68 'success':128 'suit':45 'technic':178 'timeout':150 'unit':82 'usdc':66,84,146 'usdc-settlement' 'use':65 'via':5,18,57,117 'wallet':3,16,38,173 'wallet-balance' 'x':121 'x-payment':120 'x402':6,19,59,119,125 'x402 wallet API' 'x402-payment'","prices":[{"id":"b83f81ae-506d-48e2-9d4c-ab80c555e273","listingId":"68b5d6a4-21de-47d6-99d2-805993c89828","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/CFX/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":"2026-04-18T19:28:09.304Z"}],"sources":[{"listingId":"68b5d6a4-21de-47d6-99d2-805993c89828","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/CFX/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:09.304Z","lastSeenAt":"2026-04-23T14:01:59.222Z"}],"details":{"listingId":"68b5d6a4-21de-47d6-99d2-805993c89828","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/CFX/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"address\": \"cfx:...\"}'","exampleRequest":{"address":"cfx:aak2rra2njvd77ezwjvx04kkds9fzagfe6ku8scz91"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, confirming it is live on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/wallet/CFX/balance"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC, 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/wallet/CFX/balance"},{"claim":"Site advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wallet/CFX/balance"}],"useCases":["Querying the balance of a Conflux (CFX) wallet address programmatically","Integrating CFX balance checks into trading bots or portfolio dashboards","Agent-driven wallet monitoring without needing API key registration"],"bestFor":["Developers needing quick, keyless CFX balance lookups","AI agents that can settle x402 micropayments on Base","Low-volume or sporadic wallet balance queries where per-call pricing is preferable"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users who need detailed transaction history or multi-chain wallet data","Anyone without a Base-compatible USDC wallet for x402 settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.027Z"},"updatedAt":"2026-04-23T14:01:59.222Z"}}