{"id":"38571d80-febc-4cdb-b080-0a035612a4d5","shortId":"Asa6Gm","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/143` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple 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 priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/wire/143` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example payloads. Without paying and calling the endpoint, the actual response format and data returned remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","wire API","premium API access"],"warnings":["The specific functionality of /api/v1/wire/143 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content.","No input or output schema is available; callers cannot know what to send or what to expect back.","The platform lists many API categories (AI, finance, data, etc.) but none are documented beyond endpoint names and prices."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/143","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/143","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 pricing and payment details. However, the actual functionality behind /api/v1/wire/143 is completely undocumented — no input schema, no output schema, no examples, and all documentation pages return only a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,80,151 '000':74 '20':73 '402':68 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,168 'actual':200 'addit':186 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,167,173 'attach':93 'base':8,23,51,75 'behind':158 'beyond':163 'broader':106 'call':4,19,82,196 'caller':91 'categori':111 'challeng':69 'classif':127 'connect':181 'convers':144 'crawl':170 'data':113,117,204 'doc':171 'document':162,188 'embed':128 'endpoint':55,147,198 'estim':138 'exampl':191 'exchang':133 'export':118 'feed':132 'financ':129 'format':202 'function':157 'gas':137 'generat':145 'geocod':142 'header':98 'howev':154 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'key':85 'label':165 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'page':176 'pay':2,17,35,194 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':192 'payment':48,97,103 'per':3,18,36,81,152 'platform':6,21,39,107 'premium':60,166 'premium API access' 'price':131,149,172 'prompt':183 'proof':104 'protocol':44 'quot':136 'rate':87,134 'readm':175 'remain':206 'report':116 'request':37,70,153 'requir':90 'respons':201 'return':64,178,205 'schema':189 'sentiment':123 'simpli':92 'specif':54,156 'standard':66 'summar':126 'technic':187 'text':125 'token':135 'unit':76 'unknown':207 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':182 'web3':130 'wire API' 'without':193 'x':96 'x-payment':95 'x402':11,26,43,67,102 'x402 API' 'x402-payment'","prices":[{"id":"fc5099b6-c5da-4e64-8565-bd8401e26243","listingId":"38571d80-febc-4cdb-b080-0a035612a4d5","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:47.157Z"}],"sources":[{"listingId":"38571d80-febc-4cdb-b080-0a035612a4d5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:47.157Z","lastSeenAt":"2026-04-22T19:32:28.882Z"}],"details":{"listingId":"38571d80-febc-4cdb-b080-0a035612a4d5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/143 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/143"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/143"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers or agents wanting frictionless pay-per-call access without API key management","x402-compatible agents that can settle USDC on Base","Low-volume or bursty workloads where flat $0.02/request pricing is attractive"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume bulk consumers who need volume discounts or subscription pricing","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.213Z"},"updatedAt":"2026-04-22T19:32:28.882Z"}}