{"id":"0e356d6a-e6a9-4d35-a6ff-77bf21cc3404","shortId":"wyZJA2","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides a premium API access point for retrieving account balance information (specifically account 115). It is part of a broader platform that offers a variety of x402-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/115/balance` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is purely pay-per-call.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the balance response payload looks like. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know exactly what data is returned or what request body (if any) is expected.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request body or response format","The specific meaning of 'accounts/115/balance' is unexplained — unclear what account 115 refers to","No examples of successful response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/115/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/115/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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of this specific endpoint (account 115 balance) is vague with no context on what 'account' 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'0.02':10,24,77,136 '000':125 '0x8335':130 '115':46 '20':124 '2913':131 '402':209 '6':140 'Base network API' 'USDC micropayment API' 'accept':91 'access':37,150 'account':4,18,41,45 'account balance API' 'account-balance' 'advertis':120,149 'ai':66 'analyt':65 'api':36,62,143,167 'balanc':5,19,42,196 'base':8,22,85,126,133 'base-network' 'bodi':229 'broader':52 'call':156 'caller':104 'challeng':119,210 'confirm':204 'connect':175 'content':181 'crypto payment API' 'data':64,223 'decim':141 'descript':192 'difficult':218 'doc':165 'document':157,215 'endpoint':6,20,30,89,202 'equal':135 'exact':221 'exampl':189 'expect':233 'extrem':162 'financ':69 'gate':3,17,61 'given':137 'handl':99 'header':111 'includ':106 'inform':43 'infrastructur':72 'json':96 'json-response' 'key':144 'know':220 'lack':213 'learn':68 'like':200 'limit':147 'live':205 'look':199 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':67 'make':216 'maxamountrequir':122 'must':105 'network':86 'no-api-key' 'offer':55 'openapi':185 'page':170 'part':49 'pay':9,23,154 'pay-per-cal':153 'pay-per-call balance' 'pay-per-request' 'payload':198 'payment':97,110,115 'per':11,25,78,155 'platform':53 'point':38 'post':92 'premium':35 'price':75,166 'prompt':177 'proof':116 'proper':208 'protocol':103 'provid':33 'pure':152 'rate':146 'readm':169 'render':172 'request':12,26,79,93,228 'request/response':188 'respons':197 'retriev':40 'return':95,206,225 'schema':186 'settl':80 'site':160 'span':63 'spars':163 'specif':44,88 'substant':180 'unit':127 'usdc':14,28,82,129,138 'usdc-settlement' 'util':73 'valid':114 'varieti':57 'via':100 'wallet':176 'web3':70 'x':109 'x-payment':108 'x402':2,16,60,102,118 'x402 API' 'x402-gated':1,15,59 'x402-payment'","prices":[{"id":"1624113d-5df0-4eaa-8d48-8e814d34f07d","listingId":"0e356d6a-e6a9-4d35-a6ff-77bf21cc3404","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/115/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":"2026-04-18T18:40:44.956Z"}],"sources":[{"listingId":"0e356d6a-e6a9-4d35-a6ff-77bf21cc3404","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/115/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:44.956Z","lastSeenAt":"2026-04-27T22:32:47.593Z"}],"details":{"listingId":"0e356d6a-e6a9-4d35-a6ff-77bf21cc3404","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/115/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/115/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 USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/115/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-per-call balance lookups into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Low-volume balance queries where subscription pricing is unnecessary"],"notFor":["High-volume balance queries where per-call pricing adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.203Z"},"updatedAt":"2026-04-27T22:32:47.593Z"}}