{"id":"d5561b59-2e06-41da-ac38-2264db206462","shortId":"dsjwkK","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/wire/144` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises several API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific endpoint probed here (`/api/v1/wire/144`) does not clearly map to any of those named services — it sits under a `/wire/` path whose purpose is not documented.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what data or functionality `/api/v1/wire/144` actually provides when paid.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","crypto"],"synonyms":["x402 API","USDC pay-per-call","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content","The /api/v1/wire/144 path does not correspond to any named service on the site's landing page","No request or response schema is provided; callers cannot know what to send or expect back","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/144","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific /wire/144 path is not described anywhere on the site. Effectively a stub 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'/request':12,30,160 '/wire':184 '0.02':11,29,80,159 '000':74 '20':73 '402':237 '402 payment API' '6':86 'Base network API' 'USDC pay-per-call' 'accept':52 'access':68 'actual':251 'advertis':96,114 'ai':126 'analysi':130 'analyt':120 'api':5,16,23,34,44,67,89,116,197 'attach':99 'avail':225 'base':8,26,57,75 'broader':112 'call':4,22,82 'caller':97 'categori':117 'challeng':239 'charg':70 'classif':133 'clear':172 'confirm':232 'connect':206 'content':212 'convers':150 'crawl':228 'data':119,123,247 'decim':87 'doc':196 'document':190,191,242 'embed':134 'endpoint':61,153,166,230 'estim':144 'exampl':224 'exchang':139 'export':124 'extrem':193 'feed':138 'financ':135 'function':249 'gas':143 'generat':151 'geocod':148 'header':104 'howev':163 'i.e':79 'includ':118 'infrastructur':146 'insight':125 'json-response' 'key':17,35,90 'learn':128 'limit':94 'list':64,155 'live':233 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':127 'map':173 'metric':121 'micropayment API' 'name':178 'network':58 'no-api-key' 'openapi':216 'page':201 'paid':254 'path':185 'pay':2,20,41 'pay-per-cal':1,19 'pay-per-request':40 'payment':54,103,109 'per':3,21,42,81 'platform':6,24,45,113 'point':162 'premium':66 'price':137,161,198 'probe':167 'prompt':208 'proof':110 'proper':236 'protocol':50 'provid':252 'purpos':187 'quot':142 'rate':93,140 'readm':200 'report':122 'request':43 'request/response':219 'requir':18,36 'return':203,234 'schema':220 'sentiment':129 'servic':179 'sever':115 'simpli':98 'sinc':83 'sit':181 'spars':194 'spec':217 'specif':60,165 'subscript':91 'substant':211 'summar':132 'text':131 'token':141 'unclear':245 'unit':76 'usag':223 'usdc':14,32,53,78,84 'usdc-base-network' 'use':47,85 'util':147 'valid':107,149 'via':9,27 'wallet':207 'web3':136 'whose':186 'without':241 'x':102 'x-payment':101 'x402':10,28,49,108,238 'x402 API' 'x402-payment'","prices":[{"id":"15670902-eacc-49fe-846b-b46dfdc328f5","listingId":"d5561b59-2e06-41da-ac38-2264db206462","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:44.142Z"}],"sources":[{"listingId":"d5561b59-2e06-41da-ac38-2264db206462","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/144","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:44.142Z","lastSeenAt":"2026-04-22T19:32:28.706Z"}],"details":{"listingId":"d5561b59-2e06-41da-ac38-2264db206462","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/144 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","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/144"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/144"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an undocumented premium API endpoint via x402 micropayments","Agent-driven API consumption without pre-registration or API key management","Paying per-call in USDC on Base for on-demand data or services"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-as-you-go API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need well-documented API contracts and schemas before integrating","High-volume production workloads requiring SLAs and support","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.349Z"},"updatedAt":"2026-04-22T19:32:28.706Z"}}