{"id":"1f066503-6233-4ac4-a371-6443441e25e1","shortId":"Lcw6eh","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/37/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 pay-per-call 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 appear to use the same x402 exact-payment scheme on Base with USDC at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access.\n\nThis particular endpoint (`/accounts/37/balance`) is labeled \"Premium API Access\" but its actual functionality appears to be an account balance query. Documentation beyond the landing page is extremely thin — the docs, API, pricing, 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 detailed documentation available. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","account-balance","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The endpoint path references a hardcoded account ID (37); unclear if this is parameterizable","Actual response format and fields are unknown — no examples exist in crawled material","The 'Premium API Access' label is generic and does not describe the endpoint's real function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/37/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/37/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 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The endpoint's actual functionality ('accounts/37/balance') is unclear and 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'/api/v1/accounts/37/balance':46 '/request':87 '0.02':74,86,147 '000':69 '20':68 '402':229 'Base network API' 'USDC micropayment API' 'access':161,170 'account':4,18,35,179 'account balance API' 'account-balance' 'actual':173 'advertis':152 'ai/ml':106 'analysi':109 'analyt':105 'api':102,154,169,192 'appear':132,175 'avail':220 'balanc':5,19,36,180 'base':8,22,58,70,143 'behind':49 'beyond':183 'broader':95 'call':12,26,101,149 'challeng':62,230 'classif':111 'confirm':224 'connect':201 'consist':78 'content':207 'convers':128 'cost':66 'crypto payment API' 'data':104 'detail':218 'doc':191 'document':182,219 'embed':112 'endpoint':6,20,30,131,164,222 'estim':122 'exact':139 'exact-pay':138 'exampl':215 'exchang':117 'extrem':188 'feed':116 'financ':113 'function':174 'gas':121 'gate':3,17,48 'generat':129 'geocod':126 'host':93 'indic':63 'infer':107 'infrastructur':124 'instant':160 'json-response' 'key':155 'label':167 'land':185 'limit':158 'live':225 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,92 'maximum':65 'model':89 'network':59 'openapi':211 'page':186,196 'particular':163 'pay':10,24,99 'pay-per-cal':9,23,98 'pay-per-call' 'pay-per-request API' 'payment':41,55,140 'per':11,25,52,76,100,148 'per-request':51 'platform':151 'premium':168 'price':88,115,193 'prompt':203 'protocol':42 'provid':33,81,91 'queri':181 'quot':120 'rate':118,157 'readm':195 'render':198 'request':53,77 'request/response':214 'resourc':45 'respons':231 'schema':212 'scheme':141 'sentiment':108 'site':84 'site-wid':83 'span':103 'specif':44 'substant':206 'suit':96 'summar':110 'thin':189 'token':119 'unit':71 'usd':75 'usdc':14,28,54,73,145 'usdc-base' 'use':134 'util':125 'valid':127,228 'via':38,226 'wallet':202 'web3':114 'wide':85 'x402':2,16,40,61,137 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d25aedda-ac15-4dd6-a311-d239665bbb2b","listingId":"1f066503-6233-4ac4-a371-6443441e25e1","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/37/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":"2026-04-18T18:39:34.793Z"}],"sources":[{"listingId":"1f066503-6233-4ac4-a371-6443441e25e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/37/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:34.793Z","lastSeenAt":"2026-04-28T08:33:13.327Z"}],"details":{"listingId":"1f066503-6233-4ac4-a371-6443441e25e1","quickStartSnippet":"# 1. POST to the endpoint — you'll get a 402 with payment challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/37/balance\n\n# 2. Pay the x402 challenge (0.02 USDC on Base) and include the\n#    X-PAYMENT header with your signed payment proof to get the response.","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 Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/37/balance"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","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 single paid API call","Integrating pay-per-call balance lookups into agent workflows","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing simple per-call balance data without API key management","Projects requiring USDC micropayment-settled endpoints on Base"],"notFor":["Production use cases requiring documented request/response schemas","High-volume balance queries where per-call pricing is inefficient","Users who need detailed API documentation or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.522Z"},"updatedAt":"2026-04-28T08:33:13.327Z"}}