{"id":"9bcd4319-f552-4153-88b9-602ee197f50a","shortId":"wU4EKx","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/12` is listed as \"Premium API Access\" and returns a 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/12` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform. The endpoint is live and responds with a well-formed x402 challenge, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content","The specific functionality of /api/v1/wire/12 ('Premium API Access') is completely undocumented","No OpenAPI schema or request/response examples are provided","No way to verify what data or service is returned after payment without actually paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages render only a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,166 'actual':223 'addit':183 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,165 'attach':91 'avail':197 'base':8,23,51,73 'behind':156 'beyond':161 'broader':104 'call':4,19,80 'caller':89 'categori':109 'challeng':67,219 'classif':125 'connect':178 'content':184 'convers':142 'crawl':168 'crypto-paid API' 'data':111,115 'detail':195 'doc':169 'document':160,196 'embed':126 'endpoint':55,145,203,208 'estim':136 'exampl':192 'exchang':131 'export':116 'feed':130 'financ':127 'form':217 'function':155 'gas':135 'generat':143 'geocod':140 'header':96 'howev':152 'http-post' 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'key':83 'label':163 'learn':120 'limit':86 'list':58 'live':210 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'multipl':107 'network':9,24,52 'no-api-key' 'openapi':188 'page':173 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,101,227 'per':3,18,36,79,150 'platform':6,21,39,105,206 'premium':60,164 'premium API access' 'price':129,147,170 'prompt':180 'proof':102 'protocol':44 'quot':134 'rate':85,132 'readm':172 'report':114 'request':37,68,151 'request/response':191 'requir':88 'respond':212 'return':64,175,224 'schema':189 'sentiment':121 'simpli':90 'specif':54,154 'success':226 'summar':124 'text':123 'token':133 'unit':74 'unknown':229 'upon':225 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':179 'web3':128 'well':216 'well-form':215 'x':94 'x-payment':93 'x402':11,26,43,100,218 'x402 API' 'x402-payment'","prices":[{"id":"f4a41dac-c103-46e4-8ec3-5bdd2929fdb6","listingId":"9bcd4319-f552-4153-88b9-602ee197f50a","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:37.411Z"}],"sources":[{"listingId":"9bcd4319-f552-4153-88b9-602ee197f50a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:37.411Z","lastSeenAt":"2026-04-22T20:01:46.346Z"}],"details":{"listingId":"9bcd4319-f552-4153-88b9-602ee197f50a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/12 \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/12"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/12"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads requiring well-documented schemas and error handling","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.7Z"},"updatedAt":"2026-04-22T20:01:46.346Z"}}