{"id":"a3c8c4d9-da89-483f-b7c4-5daefcb03c17","shortId":"xd22Um","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information, accessible via the x402 payment protocol on the Base network. The endpoint charges 0.02 USDC per request (20,000 base units with 6 decimals) settled in USDC on Base. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider operates a broader platform offering multiple API categories including data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.\n\nThe specific endpoint probed (`/api/v1/accounts/1/balance`) appears to be an account balance lookup. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the balance response contains or what the account ID parameter represents. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to assess actual functionality.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","micropayment","no-api-key","pay-per-request"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","Base USDC micropayment API","lowpaymentfee","crypto payment API","pay-per-call API"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","Unknown what 'accounts/1/balance' returns or what the account ID represents","The broader platform lists many endpoints (AI, finance, utils) but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/1/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/accounts/1/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and all documentation pages render only 'Connect wallet' with no technical content. The actual functionality of the balance endpoint is 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'0.02':11,24,48,136 '000':53 '20':52 '402':209 '6':57 'Base USDC micropayment API' 'access':35 'account':2,15,32,148,197 'account balance API' 'account-balance' 'actual':222 'ai':104 'analysi':108 'analyt':98 'api':65,94,158 'appear':144 'assess':221 'attach':74 'balanc':3,16,33,149,191 'base':8,21,43,54,63 'broader':90 'caller':72 'categori':95 'challeng':211 'charg':47 'check':1,14 'classif':111 'confirm':204 'connect':167 'contain':193 'convers':128 'crypto payment API' 'data':97,101 'decim':58 'descript':186 'detail':174 'difficult':219 'doc':157 'document':152,216 'embed':112 'endpoint':28,46,131,141,202 'estim':122 'exampl':181 'exchang':117 'export':102 'extrem':154 'feed':116 'field':189 'financ':113 'function':223 'gas':121 'generat':129 'geocod':126 'header':79 'howev':151 'id':198 'includ':96 'inform':34 'infrastructur':124 'insight':103 'key':66 'lack':214 'learn':106 'limit':69 'live':205 'lookup':150 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':105 'make':217 'metric':99 'micropay':6,19 'micropayment' 'multipl':93 'network':9,22,44 'no-api-key' 'offer':92 'openapi':178 'oper':88 'page':162 'paramet':199 'pay-per-call API' 'pay-per-request' 'payload':183 'payment':39,78,84 'per':12,25,50,137 'platform':91 'price':115,134,159 'probe':142 'prompt':169 'proof':85 'proper':208 'protocol':40 'provid':87 'quot':120 'rate':68,118 'readm':161 'render':164 'report':100 'repres':200 'request':13,26,51,138 'request/response':182 'requir':71 'respons':192 'return':31,206 'schema':179 'sentiment':107 'settl':59 'simpli':73 'spars':155 'specif':140 'summar':110 'technic':173 'text':109 'token':119 'uniform':133 'unit':55 'usdc':49,61 'usdc-base' 'util':125 'valid':82,127 'via':4,17,36 'wallet':168 'web3':114 'x':77 'x-payment':76 'x402':5,18,38,83,210 'x402 balance check' 'x402-payment'","prices":[{"id":"8c9abf73-1976-40da-95c1-b4dd893028b9","listingId":"a3c8c4d9-da89-483f-b7c4-5daefcb03c17","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/accounts/1/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":"2026-04-18T18:39:12.346Z"}],"sources":[{"listingId":"a3c8c4d9-da89-483f-b7c4-5daefcb03c17","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/1/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:12.346Z","lastSeenAt":"2026-04-30T10:06:14.253Z"}],"details":{"listingId":"a3c8c4d9-da89-483f-b7c4-5daefcb03c17","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/1/balance\n# Response: 402 with x402 payment challenge\n# 2. Construct an X-PAYMENT header using the x402 client SDK,\n#    paying 0.02 USDC on Base to the specified payTo address.\n# 3. Resend with the header:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/1/balance \\\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, maxAmountRequired 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/1/balance"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request micropayments","Agent-driven balance lookups without pre-registration or API keys","Integrating pay-as-you-go account data into automated workflows"],"bestFor":["Developers wanting zero-signup API access via x402","AI agents that can settle USDC payments on Base","Low-volume or sporadic balance queries where per-call pricing is preferable"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.547Z"},"updatedAt":"2026-04-30T10:06:14.253Z"}}