{"id":"84d9e2c2-0efb-4cf9-9ea9-618f3032db39","shortId":"e4JKrz","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/171/balance` is described as \"Premium API Access\" and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here is the account balance resource, not the broader catalog.\n\nDocumentation 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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live via a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","balance lookup"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of 'accounts/171/balance' is unclear — it may be a demo or placeholder endpoint","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/171/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/171/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 (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint's actual functionality ('account balance') is vaguely described with no detail on inputs or outputs.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T01:33:39.646Z","embedding":[-0.009712219,-0.0019435883,0.049072266,0.009689331,0.024642944,-0.036376953,-0.014678955,0.016235352,0.078186035,-0.06750488,0.042022705,-0.06890869,-0.034301758,-0.026245117,-0.008865356,0.027801514,-0.023757935,0.031280518,-0.06713867,0.036590576,-0.0014638901,-0.02507019,-0.005180359,0.040252686,-0.021255493,-0.038330078,-0.00674057,-0.029937744,-0.028823853,-0.04135132,0.051452637,-0.026153564,0.0019445419,0.01878357,0.01197052,-0.0007266998,0.007286072,0.026412964,0.04714966,-0.014175415,-0.035125732,-0.040008545,0.0034980774,0.013343811,-0.030639648,0.012084961,0.019577026,-0.018096924,0.005722046,-0.012588501,-0.056396484,0.010917664,0.02381897,0.013374329,0.005859375,0.030700684,-0.007507324,-0.018753052,0.02281189,0.026641846,-0.008293152,-0.049468994,-0.010612488,-0.0012674332,0.014427185,0.05722046,-0.006134033,0.045166016,-0.005443573,0.04550171,0.02368164,0.06842041,0.03253174,-0.010604858,0.01625061,-0.026306152,0.0138549805,0.038970947,-0.026351929,-0.049468994,-0.0044288635,-0.027664185,-0.0871582,-0.009460449,-0.00089645386,-0.04699707,-0.009849548,0.0039634705,-0.024902344,0.05328369,-0.077697754,-0.024124146,0.015205383,0.02619934,0.019699097,-0.035858154,-0.004283905,0.021484375,0.002111435,0.008369446,0.003540039,-0.007965088,0.041290283,-0.017562866,0.044311523,0.04284668,0.01612854,0.007144928,0.004184723,0.0058517456,-0.034362793,-0.005252838,-0.007080078,-0.03640747,0.0032081604,0.017364502,-0.03567505,0.007843018,-0.027816772,0.0059509277,-0.035461426,0.06958008,0.025756836,0.00048327446,0.023742676,-0.055908203,-0.013900757,0.017044067,-0.03074646,0.001543045,0.030929565,0.0016145706,0.012626648,-0.018875122,-0.049346924,0.011711121,-0.0006942749,-0.024353027,-0.031677246,-0.0077209473,0.03439331,-0.017562866,0.021392822,-0.0013189316,-0.089416504,-0.003004074,-0.03704834,0.010192871,-0.02684021,-0.006225586,-0.0022621155,0.009475708,-0.022567749,-0.0132751465,-0.020950317,-0.01991272,0.0009675026,0.020812988,0.0067100525,0.057373047,0.0078048706,0.028533936,0.04434204,0.0011777878,0.030715942,0.033416748,-0.028427124,-0.07098389,-0.08441162,-0.022262573,-0.00039243698,-0.021102905,-0.034942627,-0.0030002594,-0.022506714,-0.072387695,-0.011489868,0.000096559525,-0.02355957,-0.013900757,-0.006252289,-0.019744873,0.0129776,-0.016662598,-0.05126953,-0.013465881,-0.015335083,0.068115234,0.027053833,0.02394104,0.016784668,0.02204895,0.045562744,0.03503418,-0.01751709,-0.016052246,0.0011386871,-0.018737793,0.015701294,0.005870819,0.021133423,-0.024124146,0.038726807,0.051574707,-0.020950317,-0.010910034,0.013755798,-0.048980713,-0.036468506,-0.018569946,0.011672974,0.012237549,-0.010597229,0.018539429,-0.040008545,-0.017196655,0.0060043335,0.026977539,0.0043525696,0.06555176,0.0024051666,0.0075569153,0.021896362,0.016708374,-0.05871582,0.026443481,0.056121826,0.016906738,-0.012756348,-0.029647827,0.032989502,0.024002075,-0.017318726,0.012786865,0.0018396378,0.013282776,0.0030975342,0.017028809,0.03463745,-0.015403748,-0.017547607,-0.0076141357,0.006664276,0.021209717,0.018676758,-0.008926392,-0.033996582,-0.09057617,0.049957275,0.052703857,0.02281189,0.0033073425,0.009613037,-0.031097412,-0.02407837,-0.05859375,0.041625977,0.05670166,-0.010017395,-0.029220581,0.025650024,-0.0074768066,-0.022949219,-0.025756836,-0.0051574707,-0.021194458,-0.020370483,-0.013542175,-0.081726074,0.036193848,0.007007599,0.030303955,0.04751587,0.003742218,-0.050689697,-0.01335907,0.00554657,-0.0009918213,-0.032714844,0.006149292,-0.020401001,0.018493652,0.032318115,0.0035133362,0.013374329,-0.0032081604,-0.023956299,-0.0036888123,0.023361206,0.001077652,-0.023345947,0.025146484,0.01687622,-0.05142212,0.021987915,0.0061950684,0.052886963,-0.04260254,0.03643799,-0.020004272,0.017196655,0.0491333,-0.014465332,-0.04486084,0.034118652,0.007987976,0.050048828,0.05090332,0.021347046,-0.0009756088,-0.009414673,0.059692383,-0.0050735474,-0.005180359,0.009605408,0.027740479,0.030456543,-0.007583618,-0.07531738,-0.046813965,0.0021762848,-0.03881836,0.008644104,-0.020477295,0.014122009,0.0041122437,0.018066406,-0.018753052,-0.011405945,-0.041931152,0.008422852,-0.006259918,0.022338867,-0.01878357,-0.0209198,0.02281189,0.024856567,-0.0051460266,-0.019119263,0.045318604,0.026504517,-0.04473877,-0.009307861,-0.034484863,-0.021362305,-0.030960083,0.028320312,0.00522995,0.015357971,0.025512695,-0.024230957,0.008026123,0.025177002,-0.007106781,0.049926758,0.0020694733,0.0062713623,-0.06451416,-0.033843994,-0.028030396,-0.037841797,0.011817932,0.02458191,-0.014053345,0.059020996,-0.008895874,-0.018325806,-0.03100586,0.04272461,-0.043792725,0.010520935,0.03781128,-0.024414062,-0.02474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'/api/v1/accounts/171/balance':46 '/docs':164 '/pricing':166 '/readme':168 '0.02':73,129 '000':78 '0x8335':66 '20':77 '2913':67 '402':208 '6':82 'Base network API' 'USDC micropayment API' 'access':52 'account':4,18,35,152 'account balance API' 'account-balance' 'advertis':88 'ai/ml':100 'analysi':103 'analyt':99 'api':51,96,134 'avail':195 'balanc':5,19,36,153 'balance lookup' 'base':8,22,61,79 'base-network' 'broader':85,157 'call':12,26 'catalog':158 'challeng':209 'classif':105 'commit':142 'confirm':202 'connect':174 'contract':65 'convers':122 'cost':71 'crawl':198 'data':98,108 'decim':83 'describ':48 'detail':181 'document':159,190 'embed':106 'endpoint':6,20,30,125,146,200 'estim':116 'exampl':194 'exchang':111 'extrem':161 'feed':110 'finance/web3':107 'gas':115 'gate':3,17 'generat':123 'geocod':120 'howev':143 'infer':101 'infrastructur':118 'json':55 'json-response' 'key':135 'limit':138 'list':127,148 'live':203 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,86 'maximum':70 'minimum':141 'network':62 'openapi':185 'page':169 'pay':10,24,93 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':92 'payment':41,56 'per':11,25,75,94,130 'platform':87 'premium':50 'price':109 'prompt':176 'protocol':42 'provid':33 'quot':114 'rate':112,137 'render':171 'request':76,95,131 'request/response':188 'resourc':45,154 'return':54 'schema':189 'sentiment':102 'settl':58 'span':97 'spars':162 'spec':186 'specif':44,145 'suit':90 'summar':104 'technic':180 'token':113 'unit':80 'usag':193 'usdc':14,28,64,74 'usdc-settlement' 'use':63 'util':119 'valid':121,206 'via':38,204 'wallet':175 'x402':2,16,40,207 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2131381d-a40c-44fe-a733-e75ccef4da70","listingId":"84d9e2c2-0efb-4cf9-9ea9-618f3032db39","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/171/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":"2026-04-18T18:41:24.730Z"}],"sources":[{"listingId":"84d9e2c2-0efb-4cf9-9ea9-618f3032db39","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/171/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:24.730Z","lastSeenAt":"2026-04-27T22:32:49.127Z"}],"details":{"listingId":"84d9e2c2-0efb-4cf9-9ea9-618f3032db39","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/171/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":"Endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/171/balance"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/171/balance"}],"useCases":["Querying account balance information via a single paid API call","Integrating pay-per-request balance checks into agent workflows","Demonstrating x402 payment protocol usage on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand account balance data without API key management","Low-volume, pay-as-you-go API consumption"],"notFor":["High-volume balance queries where per-call fees add up","Users needing detailed API documentation or SDKs before integration","Production workloads requiring SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.263Z"},"updatedAt":"2026-04-27T22:32:49.127Z"}}