{"id":"7cb206f9-7e4f-4a77-bc3e-4a98df085ddf","shortId":"JyDrNv","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/28/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 advertised flat $0.02/request pricing across all their API endpoints.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of x402-gated APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol using USDC on Base.\n\nThis particular endpoint appears to return account balance information in JSON format. However, documentation 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 schema, no request/response examples, and no description of what fields the balance response contains or what parameters the POST request accepts. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes integration uncertain without experimentation.","tags":[],"capabilities":["x402-payment","usdc-on-base","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","USDC payment API","x402 API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific endpoint /api/v1/accounts/28/balance references a hardcoded account ID (28) with no explanation of what this account represents","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/28/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/28/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 402 challenge with clear pricing, but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose of this specific endpoint (account 28 balance) is unclear and 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'/request':86,137 '0.02':74,85,136 '000':69 '20':68 '402':231 'Base network API' 'USDC payment API' 'accept':222 'account':4,18,35,168 'account balance API' 'account-balance' 'across':88 'advertis':83 'ai/ml':108 'analysi':110 'analyt':107 'api':91,104,141,181 'appear':165 'balanc':5,19,36,169,213 'base':8,22,58,70,161 'behind':49 'broader':98 'call':12,26 'catalog':99 'challeng':62,232 'classif':112 'commit':148 'confirm':226 'connect':190 'consist':78 'contain':215 'convers':129 'cost':66 'crypto payment endpoint' 'data':106 'descript':208 'detail':197 'doc':180 'document':175,237 'embed':113 'endpoint':6,20,30,92,132,164,224 'entir':153 'estim':123 'exampl':205 'exchang':118 'experiment':242 'extrem':177 'feed':117 'field':211 'financ':114 'flat':84 'format':173 'gas':122 'gate':3,17,48,103 'generat':130 'geocod':127 'handl':152 'host':96 'howev':174 'indic':63 'inform':170 'infrastructur':125 'integr':239 'json':172 'json-response' 'key':142 'lack':235 'limit':145 'live':227 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Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:26.329Z"}],"sources":[{"listingId":"7cb206f9-7e4f-4a77-bc3e-4a98df085ddf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/28/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:26.329Z","lastSeenAt":"2026-04-30T08:34:12.722Z"}],"details":{"listingId":"7cb206f9-7e4f-4a77-bc3e-4a98df085ddf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/28/balance \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires a maximum of 20,000 base units of USDC (USD Coin) on the Base network, equating to $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/accounts/28/balance"},{"claim":"The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers additional API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating keyless API access into agent workflows via x402 protocol","Programmatic balance lookups without subscription or API key management"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-per-use over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.897Z"},"updatedAt":"2026-04-30T08:34:12.722Z"}}