{"id":"d6c240b2-9e78-452a-bcff-8c52ff8de597","shortId":"bRMKhH","kind":"x402","title":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/wire/10` is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site's advertised flat $0.02/request pricing.\n\nThe broader platform advertises four categories of APIs: 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. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 protocol using USDC on Base.\n\nDocumentation is extremely sparse. 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 for any endpoint. The purpose and behavior of the `/api/v1/wire/10` endpoint specifically is unclear — the name \"Premium API Access\" is generic and does not describe what data or functionality it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["x402 API","pay per call API","micropayment API","USDC API access","Base network API","low fee API","crypto pay API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/wire/10 ('Premium API Access') is undefined","No OpenAPI schema or request/response examples provided for any endpoint","No rate limit or SLA information available","Cannot verify that the advertised AI, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/10","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/10","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 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/wire/10 is entirely unclear. The docs/pricing/API pages are empty beyond a wallet connect 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'/request':19,38,102,153 '0.02':18,37,90,101,152 '000':85 '20':84 'Base network API' 'USDC API access' 'accept':71 'access':50,69,169,234 'advertis':99,107 'ai':12,31,119 'ai-inference' 'analysi':123 'analyt':113 'api':5,24,48,68,111,160,188,233 'base':8,27,58,75,86,181 'behavior':222 'broader':105 'call':4,23 'categori':109 'challeng':78 'classif':126 'classification' 'collect':42 'connect':197 'consist':94 'content':203 'convers':143 'cost':82 'crypto pay API' 'data':11,30,112,116,242 'data-analytics' 'describ':240 'detail':214 'doc':187 'document':182,215 'embed':127 'embeddings' 'emphas':158 'endpoint':16,35,49,62,146,218,226 'entir':173 'estim':137 'exampl':211 'exchang':132 'export':117 'extrem':184 'feed':131 'financ':13,32,128 'finance-data' 'flat':100 'four':108 'function':244 'gas':136 'generat':144 'generic':236 'geocod':141 'geocoding' 'handl':172 'indic':79 'infrastructur':139 'insight':118 'instant':168 'key':161 'learn':121 'limit':164 'list':65,148 'low fee API' 'lowpaymentfee.com':39 'machin':120 'maximum':81 'metric':114 'micropayment API' 'minimum':166 'name':231 'network':59 'offer':40 'openapi':207 'page':192 'pay':2,21,45 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':44 'payment':54,73,170 'per':3,22,46,92 'platform':106,157 'point':155 'premium':67,232 'price':103,130,154,189 'prompt':199 'protocol':55,177 'purpos':220 'quot':135 'rate':133,163 'readm':191 'render':194 'report':115 'request':47,93 'request/response':210 'return':246 'schema':208 'sentiment':122 'sentiment-analysis' 'site':97 'spars':185 'specif':61,227 'substant':202 'suit':6,25 'summar':125 'text':124 'text-summarization' 'token':134 'unclear':229 'unit':87 'usd':91 'usdc':72,89,179 'usdc-base' 'use':178 'util':15,34,140 'utility-apis' 'valid':142 'via':9,28,51 'wallet':198 'web3':129 'x402':10,29,53,77,176 'x402 API' 'x402-payment'","prices":[{"id":"b24acf28-86d3-439e-bd31-443a7812303e","listingId":"d6c240b2-9e78-452a-bcff-8c52ff8de597","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:29.469Z"}],"sources":[{"listingId":"d6c240b2-9e78-452a-bcff-8c52ff8de597","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:29.469Z","lastSeenAt":"2026-04-22T07:31:59.343Z"}],"details":{"listingId":"d6c240b2-9e78-452a-bcff-8c52ff8de597","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/10 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/10"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/10"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Using utility services like geocoding, validation, and data conversion on a pay-as-you-go basis","Programmatic agents purchasing API calls autonomously via x402 on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle payments autonomously via x402/USDC on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation and response schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.077Z"},"updatedAt":"2026-04-22T07:31:59.343Z"}}