{"id":"df032d23-a989-44da-b597-edab5535365a","shortId":"Ldft9t","kind":"x402","title":"Check account balance via x402 micropayment on Base for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides account balance information behind an x402 paywall. The specific resource `/api/v1/accounts/123/balance` accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe provider operates a broader platform offering dozens of pay-per-call 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 — payment is handled entirely through the x402 protocol.\n\nDocumentation 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 spec, no request/response schema documentation, and no usage examples. The specific account balance endpoint probed here uses a hardcoded account ID (123), and it is unclear whether the path supports arbitrary account IDs or what fields the response contains. The endpoint is confirmed live (402 challenge returned successfully).","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","balance check endpoint"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request body and response format are completely unknown","The probed path uses a hardcoded account ID (123); unclear if this is parameterizable","The platform lists many diverse API categories (AI, finance, geocoding, etc.) at uniform $0.02 pricing with no detail on data sources or model providers, which raises questions about actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/123/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/123/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific endpoint path contains a hardcoded account ID with no explanation. The platform's purpose and data sources are 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'0.02':10,22,63,118 '000':67 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':57 '123':188 '20':66 '402':211 '6':71 'Base network API' 'USDC pay-per-call' 'accept':41 'account':2,14,30,178,186,198 'account balance API' 'account-balance' 'ai/ml':90 'analysi':93 'analyt':89 'api':86,123,146 'arbitrari':197 'balanc':3,15,31,179 'balance check endpoint' 'base':8,20,52,68 'behind':33 'broader':77 'call':85 'challeng':212 'check':1,13 'classif':95 'commit':131 'confirm':209 'connect':155 'contain':205 'contract':56 'convers':111 'cost':61 'crypto payment API' 'data':88 'decim':72 'detail':162 'doc':145 'document':140,171 'dozen':80 'embed':96 'endpoint':26,114,180,207 'entir':135 'estim':105 'exampl':175 'exchang':100 'extrem':142 'feed':99 'field':202 'finance/web3':97 'gas':104 'generat':112 'geocod':109 'handl':134 'hardcod':185 'id':187,199 'infer':91 'inform':32 'infrastructur':107 'json':46 'json-response' 'key':124 'limit':127 'list':116 'live':210 'lowpaymentfee' 'lowpaymentfee.com':28 'maximum':60 'micropay':6,18 'minimum':130 'network':53 'no-api-key' 'offer':79 'openapi':166 'oper':75 'page':150 'path':195 'pay':83 'pay-per-cal':82 'pay-per-request' 'payment':47,132 'paywal':36 'per':11,23,64,84,119 'platform':78 'post':42 'price':98,147 'probe':181 'prompt':157 'protocol':139 'provid':29,74 'quot':103 'rate':101,126 'readm':149 'render':152 'request':12,24,43,65,120 'request/response':169 'resourc':39 'respons':204 'return':45,213 'schema':170 'sentiment':92 'settl':49 'span':87 'spars':143 'spec':167 'specif':38,177 'success':214 'summar':94 'support':196 'technic':161 'token':102 'unclear':192 'unit':69 'usag':174 'usdc':55 'usdc-base' 'use':54,183 'util':108 'valid':110 'via':4,16 'wallet':156 'whether':193 'x402':5,17,35,138 'x402 micropayment API' 'x402-payment'","prices":[{"id":"3fc7162c-2770-4e41-956b-c2e9669d463b","listingId":"df032d23-a989-44da-b597-edab5535365a","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/123/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":"2026-04-18T18:40:52.153Z"}],"sources":[{"listingId":"df032d23-a989-44da-b597-edab5535365a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/123/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:52.153Z","lastSeenAt":"2026-04-29T03:33:52.412Z"}],"details":{"listingId":"df032d23-a989-44da-b597-edab5535365a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/123/balance\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment on Base to complete the request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 v1 challenge accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/123/balance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/123/balance"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-as-you-go balance lookups into agent workflows","Accessing financial data without API key registration"],"bestFor":["Developers wanting zero-signup API access paid via crypto","AI agents that can settle x402 payments on Base","Quick one-off balance queries without subscription overhead"],"notFor":["Users needing detailed API documentation or response schemas before integration","High-volume use cases where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.852Z"},"updatedAt":"2026-04-29T03:33:52.412Z"}}