{"id":"2998d10e-e7f7-4163-a598-433d0a6c78d4","shortId":"mhGh8G","kind":"x402","title":"x402-payable account balance endpoint on Base, $0.02 per request in USDC.","tagline":"x402-payable account balance endpoint on Base, $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/127/balance` returns balance information for account 127 in JSON format. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units (i.e., $0.02 per request, since USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broader catalog of x402-payable APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 usage examples available. The endpoint is confirmed live via a valid x402 402 challenge, but the actual behavior and response format of the balance endpoint can only be inferred from the endpoint path and MIME type (application/json).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","json-response","per-request-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee API","crypto payment endpoint"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","Actual response format and fields for the balance endpoint are unknown","The endpoint path references a hardcoded account ID (127); unclear if this is parameterizable","Provider catalog lists many endpoints but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/127/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/127/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 via a valid x402 402 challenge, but there is zero documentation on request parameters, response schema, or actual functionality. The docs, pricing, API, and README pages are all blank beyond a wallet connect prompt. The listing title 'Premium API Access' is generic and uninformative. Without any schema or examples, this is effectively a 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'/api/v1/accounts/127/balance':44 '/docs':148 '/pricing':149 '/readme':152 '0.02':9,22,76,128 '000':72 '0x8335':64 '127':50 '20':71 '2913':65 '402':189 '6':82 'Base network API' 'USDC micropayment API' 'account':4,17,33,49 'account balance API' 'account-balance' 'actual':193 'ai/ml':99 'analysi':102 'analyt':98 'api':95,133 'application/json':213 'avail':179 'balanc':5,18,34,46,200 'base':8,21,59,73 'base-network' 'behavior':194 'broader':89 'catalog':90 'challeng':190 'classif':104 'commit':141 'confirm':183 'connect':158 'contract':63 'convers':121 'cost':69 'crypto payment endpoint' 'data':97 'decim':83 'detail':165 'document':143,174 'embed':105 'endpoint':6,19,28,124,181,201,208 'estim':115 'exampl':178 'exchang':110 'extrem':145 'feed':109 'financ':106 'format':53,197 'gas':114 'generat':122 'geocod':119 'host':87 'i.e':75 'infer':100,205 'inform':47 'infrastructur':117 'json':52 'json-response' 'key':134 'limit':137 'list':126 'live':184 'lookup':35 'lowpaymentfee API' 'lowpaymentfee.com':30,86 'maximum':68 'mime':211 'minimum':140 'network':60 'no-api-key' 'openapi':169 'page':153 'path':209 'pay-per-call balance' 'payabl':3,16,94 'payment':39,54 'per':10,23,77,129 'per-request-pricing' 'price':108 'prompt':160 'protocol':40 'provid':31,85 'quot':113 'rate':111,136 'render':155 'request':11,24,78,130 'request/response':172 'requir':142 'resourc':43 'respons':196 'return':45 'schema':173 'sentiment':101 'settl':56 'sinc':79 'span':96 'spars':146 'spec':170 'specif':42 'summar':103 'technic':164 'token':112 'type':212 'unit':74 'usag':177 'usdc':13,26,62,80 'usdc-settlement' 'use':61,81 'util':118 'valid':120,187 'via':36,185 'wallet':159 'web3':107 'x402':2,15,38,93,188 'x402 balance check' 'x402-payable':1,14,92 'x402-payment'","prices":[{"id":"e0ba3bdf-615d-4e0e-8c5f-eb91caa7e90c","listingId":"2998d10e-e7f7-4163-a598-433d0a6c78d4","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/127/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":"2026-04-18T18:40:51.570Z"}],"sources":[{"listingId":"2998d10e-e7f7-4163-a598-433d0a6c78d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/127/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:51.570Z","lastSeenAt":"2026-04-29T03:33:52.412Z"}],"details":{"listingId":"2998d10e-e7f7-4163-a598-433d0a6c78d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/127/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 requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/127/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/127/balance"},{"claim":"Provider lists all endpoints at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a Connect wallet prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information via a pay-per-request model","Integrating x402-compatible agents with on-chain USDC micropayments on Base","Accessing financial data without API key registration or subscription"],"bestFor":["Agents or bots that need frictionless pay-per-call access without signup","Developers experimenting with x402 protocol integrations","Use cases requiring low-cost, no-commitment API access on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","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":"2026-02-17T23:14:34.853Z"},"updatedAt":"2026-04-29T03:33:52.412Z"}}