{"id":"94b8b04c-0adf-48fa-9da0-3f71da0cd767","shortId":"3PBeTC","kind":"x402","title":"x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, pay $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 77). It is part of a broader platform that offers a variety of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/77/balance` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a valid payment proof. The challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and did not yield substantive content during crawl, so the exact response schema and detailed usage instructions are unknown. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","json-response","per-request-pricing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance endpoint","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee API","crypto-gated API"],"warnings":["Documentation pages (/docs, /pricing, /README) all returned only 'Connect wallet' with no substantive content","No OpenAPI or response schema available — the response format is entirely unknown","The meaning of 'accounts/77/balance' is unclear; it is unknown what account system or data source is being queried","The broader platform lists many endpoint categories (AI, analytics, finance, utils) all at $0.02, but none were probed for liveness beyond this one"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/77/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/77/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no response examples, and all documentation pages returned only a 'Connect wallet' prompt with no usable content. The purpose of 'account 77 balance' is opaque — it is unclear what account system this refers 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'/docs':169 '/pricing':170 '/readme':171 '0.02':10,24,77,136 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':130 '20':124 '2913':131 '300':153 '402':205 '6':140 '77':46 'Base network API' 'USDC micropayment API' 'accept':91 'access':37,166 'account':4,18,41,45 'account balance API' 'account-balance' 'address':147 'advertis':119,157 'ai/ml':67 'amount':122 'analyt':66 'api':36,62,159 'appear':172 'balanc':5,19,42 'base':8,22,85,126,133 'base-network' 'broader':52 'caller':104 'challeng':118,206 'connect':177 'contain':112 'content':183 'crawl':185 'crypto-gated API' 'data':65,70 'decim':141 'detail':192 'document':167 'endpoint':6,20,30,63,89,198 'equal':135 'exact':188 'finance/web3':69 'gate':3,17,61 'given':137 'handl':99 'header':111 'includ':106 'infer':68 'inform':43 'infrastructur':72 'instant':165 'instruct':194 'json':96 'json-response' 'key':160 'limit':163 'live':200 'lowpaymentfee API' 'lowpaymentfee.com':32 'max':121 'must':105 'network':86 'no-api-key' 'offer':55 'page':168 'part':49 'pay':9,23 'pay-per-call balance' 'payment':97,110,115,143 'per':11,25,78 'per-request-pricing' 'platform':53,156 'point':38 'post':92 'premium':35 'price':75 'proof':116 'proper':204 'protocol':103 'provid':33 'rate':162 'request':12,26,79,93 'requir':174 'respons':189 'retriev':40 'return':95,202 'schema':190 'second':154 'sent':145 'settl':80 'span':64 'specif':44,88 'substant':182 'timeout':151 'unit':127 'unknown':196 'usag':193 'usdc':14,28,82,129,138 'usdc-settlement' 'util':73 'valid':114 'varieti':57 'via':100 'wallet':176 'x':109 'x-payment':108 'x402':2,16,60,102 'x402 balance endpoint' 'x402-gated':1,15,59 'x402-payment' 'yield':181","prices":[{"id":"05cebf39-c376-40c5-84f5-535a129a899e","listingId":"94b8b04c-0adf-48fa-9da0-3f71da0cd767","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/77/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":"2026-04-18T18:40:07.280Z"}],"sources":[{"listingId":"94b8b04c-0adf-48fa-9da0-3f71da0cd767","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/77/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:07.280Z","lastSeenAt":"2026-04-28T03:33:09.319Z"}],"details":{"listingId":"94b8b04c-0adf-48fa-9da0-3f71da0cd767","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/77/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 network","source_url":"https://lowpaymentfee.com/api/v1/accounts/77/balance"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/77/balance"}],"useCases":["Retrieving account balance data with per-request USDC micropayments","Integrating pay-per-call balance checks into agent workflows","Accessing financial account information without API key registration"],"bestFor":["Agents or services that need on-demand account balance lookups without subscription commitments","Developers experimenting with x402 payment-gated APIs on Base","Workflows requiring low-cost, keyless API access"],"notFor":["High-volume balance polling where per-request costs would accumulate significantly","Users who need detailed documentation or guaranteed SLAs before integration","Non-crypto-native callers who cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.04Z"},"updatedAt":"2026-04-28T03:33:09.319Z"}}