{"id":"3a8dfa9b-b6ab-4e30-90e9-0c2a8e8c3262","shortId":"DjGkfd","kind":"x402","title":"x402-gated account balance endpoint on Base, paid per-call in USDC.","tagline":"x402-gated account balance endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/accounts/43/balance`. It is part of a broader platform that offers dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all payable per-request in USDC on the Base network with no API keys or rate limits required.\n\nThe specific endpoint probed (`/api/v1/accounts/43/balance`) returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call, consistent with the site's advertised flat $0.02/request pricing. Payment is settled on-chain via the \"exact\" scheme to address `0x1A2B…85F3` using the canonical Base USDC contract (`0x8335…2913`). The challenge specifies a 300-second timeout and expects HTTP POST requests.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint name (\"accounts/43/balance\") suggests it returns an account balance, but the exact request body format and response shape are unknown. The platform appears to be a demonstration or early-stage service showcasing low-fee x402 micropayments rather than a mature, documented API product.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","account-balance","no-api-key","micropayment"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto-gated endpoint","402 payment required API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages render only 'Connect wallet' with no content","The endpoint path '/api/v1/accounts/43/balance' appears to reference a specific hardcoded account (43) — purpose and generalizability are unclear","Platform may be a demo or early-stage project; maturity is uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/43/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/43/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 with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (account 43 balance) is unclear and may be a demo. Docs pages are empty beyond a wallet-connect 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'/request':118 '0.02':106,117 '000':101 '0x1a2b':132 '0x8335':140 '20':100 '2913':141 '300':146 '402 payment required API' '85f3':133 'Base network API' 'USDC pay-per-call' 'access':37 'account':4,18,196 'account balance API' 'account-balance' 'accounts/43/balance':191 'address':131 'advertis':115 'ai/ml':62 'analyt':61 'api':36,57,82,161,232 'appear':211 'balanc':5,19,197 'base':8,22,78,102,137 'bodi':202 'broader':48 'call':12,26,109 'canon':136 'chain':125 'challeng':96,143 'connect':169 'consist':110 'content':175 'contract':139 'crypto-gated endpoint' 'data':60,65 'demonstr':215 'doc':159 'document':154,231 'dozen':52 'earli':218 'early-stag':217 'endpoint':6,20,30,58,90,189 'exact':128,200 'exampl':187 'expect':150 'extrem':156 'fee':224 'finance/web3':64 'flat':116 'format':203 'gate':3,17,56 'http':151 'infer':63 'key':83 'limit':86 'low':223 'low-fe':222 'lowpaymentfee' 'lowpaymentfee.com':32 'matur':230 'micropay':226 'micropayment' 'name':190 'network':79 'no-api-key' 'offer':51 'on-chain':123 'openapi':179 'page':164 'paid':9,23 'part':45 'path':41 'payabl':70 'payment':120 'per':11,25,72,108 'per-cal':10,24 'per-request':71 'per-request-billing' 'platform':49,210 'post':152 'premium':35 'price':119,160 'probe':91 'product':233 'prompt':171 'provid':33 'rate':85 'rather':227 'readm':163 'render':166 'request':73,97,153,201 'request/response':182 'requir':87 'resourc':38 'respons':205 'return':93,194 'schema':183 'scheme':129 'second':147 'servic':68,220 'settl':122 'shape':206 'showcas':221 'site':113 'span':59 'spec':180 'specif':89 'specifi':144 'stage':219 'suggest':192 'thin':157 'timeout':148 'unit':103 'unknown':208 'usag':186 'usd':107 'usdc':14,28,75,105,138 'usdc-base' 'use':134 'util':67 'via':126 'wallet':170 'x402':2,16,55,95,225 'x402 micropayment API' 'x402-gated':1,15,54 'x402-payment'","prices":[{"id":"579e2774-46a0-44aa-8fb1-f92802911377","listingId":"3a8dfa9b-b6ab-4e30-90e9-0c2a8e8c3262","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/43/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":"2026-04-18T18:39:40.669Z"}],"sources":[{"listingId":"3a8dfa9b-b6ab-4e30-90e9-0c2a8e8c3262","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/43/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:40.669Z","lastSeenAt":"2026-04-28T08:33:13.510Z"}],"details":{"listingId":"3a8dfa9b-b6ab-4e30-90e9-0c2a8e8c3262","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/43/balance\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/43/balance"},{"claim":"The platform advertises $0.02/request flat pricing 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/43/balance"},{"claim":"Documentation, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying an account balance via a pay-per-call x402 endpoint","Demonstrating x402 micropayment protocol integration on Base","Agent-driven on-chain payment for API access without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Use cases needing keyless, pay-per-request API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need fiat or off-chain payment options","High-throughput use cases where $0.02/request adds up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.276Z"},"updatedAt":"2026-04-28T08:33:13.510Z"}}