{"id":"68aa82e5-5ff4-40f8-b5c5-6840a5ddf56f","shortId":"yCjmvW","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or upfront commitments.\n\nThe specific endpoint at `/api/v1/wire/53` is listed as \"Premium API Access.\" Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST requests and returns `application/json`. Payment is made via the x402 exact scheme, with a 300-second timeout window.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 per request price point. However, documentation beyond the landing page is essentially empty (docs, pricing, and README pages all show only a \"Connect wallet\" prompt), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","http-post","no-api-key","no-rate-limits"],"categories":["general","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","premium api access","wire api"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content.","The specific function of /api/v1/wire/53 ('Premium API Access') is not described anywhere; it is unclear what data or service it provides.","No request or response schema is published for any endpoint on the platform.","The platform lists many endpoint categories (AI, finance, analytics, utils) but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/53","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/wire/53","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, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/wire/53' specifically is unclear beyond the generic label 'Premium API Access.' The docs, pricing, and README pages are all blank 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'/request':12,30 '0.02':11,29,65,116,175 '000':105 '0x8335':110 '20':104 '2913':111 '300':141 '6':120 'accept':124 'access':95 'actual':203 'advertis':99,148 'ai/ml':55 'amount':102 'analysi':152 'analyt':54 'api':5,16,23,34,43,78,94 'application/json':130 'base':8,26,70,106,113 'base usdc api' 'beyond':182 'broad':48 'broader':146 'call':4,22,63 'chain':75 'challeng':98 'classif':155 'commit':84 'connect':198 'convers':167 'cost':64 'data':53,58,169 'decim':121 'doc':189 'document':181 'embed':156 'empti':188 'enabl':42 'endpoint':51,87,123,149,208 'equal':115 'essenti':187 'estim':164 'everi':62 'exact':137 'exchang':159 'feed':158 'finance/web3':57 'gas':163 'generat':170 'geocod':165 'given':117 'howev':180 'http':125 'http-post' 'individu':207 'infer':56 'json-api' 'key':17,35,79 'land':184 'limit':81 'list':91 'low payment fee' 'lowpaymentfee.com':37 'made':133 'max':101 'micropayment api' 'network':71 'no-api-key' 'no-rate-limits' 'offer':46 'on-chain':73 'page':185,193 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-call' 'payment':131 'per':3,21,176 'platform':6,24,44,147 'point':179 'post':126 'premium':93 'premium api access' 'price':157,178,190 'prompt':200 'quot':162 'rate':80,160 'readm':192 'request':127,177 'request/response':204 'requir':18,36 'return':129 'schema':205 'scheme':138 'second':142 'sentiment':151 'servic':61 'set':49 'settl':72 'show':195 'span':52 'specif':86 'summar':154 'text':153 'timeout':143 'token':161 'unit':107 'unknown':210 'upfront':83 'usdc':14,32,67,109,118 'usdc-base' 'util':60 'valid':166 'via':9,27,134 'wallet':199 'window':144 'wire api' 'x402':10,28,41,97,136 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"27a5dd30-0238-430f-8b45-c9cc87bc0223","listingId":"68aa82e5-5ff4-40f8-b5c5-6840a5ddf56f","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/wire/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:06.503Z"}],"sources":[{"listingId":"68aa82e5-5ff4-40f8-b5c5-6840a5ddf56f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:06.503Z","lastSeenAt":"2026-04-22T07:32:01.054Z"}],"details":{"listingId":"68aa82e5-5ff4-40f8-b5c5-6840a5ddf56f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/53"},{"claim":"All endpoints cost $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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/53"},{"claim":"Docs, pricing, and README pages show only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API key management","Programmatic access to utility or data endpoints with per-call crypto micropayments","Testing x402 payment flows on Base network"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-native agents that can settle USDC on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.24Z"},"updatedAt":"2026-04-22T07:32:01.054Z"}}