{"id":"ac39fc20-7b2d-4455-8553-01a774f94865","shortId":"CwJELR","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/wire/180` is listed as \"Premium API Access\" with a max amount of 20,000 base units of USDC (0.02 USDC = $0.02), consistent with the site-wide pricing. The platform advertises no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 payment header. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality behind the `/api/v1/wire/180` path is unclear — it does not map to any of the named endpoints listed on the homepage. Users should treat this as an exploratory integration until more documentation becomes available.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api","crypto api access"],"warnings":["The endpoint path /api/v1/wire/180 does not correspond to any named endpoint on the homepage catalog — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content.","No OpenAPI schema, request/response examples, or detailed endpoint documentation available.","No information about rate limits, uptime guarantees, or data sources."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/180","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but documentation is essentially nonexistent — all doc pages return only 'Connect wallet'. The specific /api/v1/wire/180 endpoint is not described anywhere on the site, there is no OpenAPI schema, and no request/response examples are available. This is effectively a stub 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'/request':12,31 '0.02':11,30,99,135,137 '000':130 '20':129 '402 payment api' 'accept':180 'access':123,158 'across':58 'advertis':147 'ai':15,34,68 'ai-inference' 'amount':127 'analysi':72 'analyt':62 'api':5,24,45,122,149,189 'avail':255 'base':8,27,107,131 'base network api' 'becom':254 'behind':223 'broad':50 'call':4,23 'captur':173 'catalog':51 'categori':60 'challeng':170 'classif':75 'classification' 'confirm':174 'connect':198 'consist':138 'content':204 'convers':92 'conversion' 'crypto api access' 'data':14,33,61,65 'data-analytics' 'detail':215 'doc':188 'document':183,216,253 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,115,176,219,238 'entir':162 'estim':86 'exact':221 'exampl':212 'exchang':81 'exchange-rates' 'exploratori':249 'export':66 'extrem':185 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'function':222 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'handl':161 'header':167 'homepag':242 'infrastructur':88 'insight':67 'instant':157 'integr':250 'key':150 'learn':70 'limit':153 'list':119,239 'live':178 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'map':232 'max':126 'metric':63 'micropayment api' 'minimum':155 'name':237 'network':108 'offer':48 'openapi':208 'page':193 'paid':102 'path':226 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':159,166 'per':3,22,55,100 'platform':6,25,46,146 'post':181 'premium':121 'price':79,97,144,190 'prompt':200 'protocol':112 'quot':84 'rate':82,152 'readm':192 'report':64 'request':56,101,182 'request/response':211 'return':195 'schema':209 'sentiment':71 'sentiment-analysis' 'site':142 'site-wid':141 'spars':186 'specif':114 'substant':203 'success':172 'summar':74 'text':73 'text-summarization' 'token':83 'treat':245 'unclear':228 'unit':132 'usdc':104,134,136 'usdc api' 'usdc-base' 'user':243 'util':18,37,89 'valid':91 'validation' 'via':9,28,109 'wallet':199 'web3':78 'wide':143 'x402':10,29,43,111,165,169 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"31ca2dc7-83f1-4583-9f98-08819e3d2435","listingId":"ac39fc20-7b2d-4455-8553-01a774f94865","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:02.266Z"}],"sources":[{"listingId":"ac39fc20-7b2d-4455-8553-01a774f94865","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/180","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:02.266Z","lastSeenAt":"2026-04-22T07:01:44.592Z"}],"details":{"listingId":"ac39fc20-7b2d-4455-8553-01a774f94865","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/180 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/180"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/180"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion via micropayments"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","x402-compatible clients that can settle USDC payments on Base"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.47Z"},"updatedAt":"2026-04-22T07:01:44.592Z"}}