{"id":"590dfded-25dc-4ec3-bb14-cc58c2b6441c","shortId":"GztVng","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/130/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the provider's site-wide $0.02/request pricing model.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of x402-gated 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 advertised at $0.02 per request with no API keys, no rate limits, and instant access. Payment settles in USDC on the Base L2 network.\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 schema, no request/response examples, and no description of what the balance endpoint actually returns. The endpoint is confirmed live (returns a valid x402 402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","USDC payment API","x402 endpoint","Base network API","pay-per-call API","lowpaymentfee","crypto payment gateway"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific endpoint path (/api/v1/accounts/130/balance) has a hardcoded account ID (130); unclear if this is parameterizable","Purpose and response structure of the balance endpoint are unknown — only the URL path suggests it returns an account balance"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/130/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/130/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, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /accounts/130/balance resource is only inferable from its URL 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'/api/v1/accounts/130/balance':46 '/docs':161 '/pricing':162 '/readme':165 '/request':87 '0.02':74,86,134 '000':69 '20':68 '402':206 'Base network API' 'USDC payment API' 'access':146 'account':4,18,35 'account balance API' 'account-balance' 'actual':195 'advertis':132 'ai/ml':105 'analysi':108 'analyt':104 'api':101,139 'balanc':5,19,36,193 'base':8,22,58,70,153 'base-network' 'behind':49 'broader':95 'call':12,26 'challeng':62,207 'classif':110 'confirm':200 'connect':171 'consist':78 'convers':127 'cost':66 'crypto payment gateway' 'data':103 'descript':189 'detail':178 'difficult':215 'document':156,212 'embed':111 'endpoint':6,20,30,130,194,198 'estim':121 'exampl':186 'exchang':116 'expect':226 'extrem':158 'feed':115 'financ':112 'gas':120 'gate':3,17,48,100 'generat':128 'geocod':125 'host':93 'indic':63 'infer':106 'infrastructur':123 'instant':145 'key':140 'know':217 'l2':154 'lack':210 'limit':143 'live':201 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,92 'make':213 'maximum':65 'model':89 'network':59,155 'no-api-key' 'openapi':182 'page':166 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payload':219 'payment':41,55,147 'per':11,25,52,76,135 'per-request':51 'price':88,114 'prompt':173 'protocol':42 'provid':33,81,91 'quot':119 'rate':117,142 'render':168 'request':53,77,136 'request/response':185 'resourc':45 'respons':224 'return':196,202 'schema':183 'send':221 'sentiment':107 'settl':148 'site':84 'site-wid':83 'span':102 'spars':159 'specif':44 'suit':96 'summar':109 'technic':177 'token':118 'unit':71 'usd':75 'usdc':14,28,54,73,150 'usdc-settlement' 'util':124 'valid':126,204 'via':38 'wallet':172 'web3':113 'wide':85 'x402':2,16,40,61,99,205 'x402 endpoint' 'x402-gated':1,15,98 'x402-payment'","prices":[{"id":"8a65c465-8192-4975-9786-6dd6c5fae4f4","listingId":"590dfded-25dc-4ec3-bb14-cc58c2b6441c","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/130/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":"2026-04-18T18:40:55.229Z"}],"sources":[{"listingId":"590dfded-25dc-4ec3-bb14-cc58c2b6441c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/130/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:55.229Z","lastSeenAt":"2026-04-27T22:03:23.076Z"}],"details":{"listingId":"590dfded-25dc-4ec3-bb14-cc58c2b6441c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/130/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":"The x402 challenge returns maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/130/balance"},{"claim":"All endpoints 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 provider offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information via a pay-per-request model","Integrating x402 micropayment-gated API calls into agent workflows","Accessing financial data without traditional API key provisioning"],"bestFor":["Agents or applications that already support x402 payment flows","Users who want keyless, pay-as-you-go API access","Developers experimenting with x402 protocol integration on Base"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may not be cost-effective","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.725Z"},"updatedAt":"2026-04-27T22:03:23.076Z"}}