{"id":"aa524ce8-5320-469a-9d41-7ed10f25ecab","shortId":"y22jBk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/wire/192` is listed as \"Premium API Access\" and accepts HTTP POST requests. Payment is settled on-chain via the x402 exact-payment scheme using USDC (contract 0x8335…2913) on Base. The x402 challenge confirms the endpoint is live, advertising a maxAmountRequired of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/wire/192` endpoint specifically returns. The site's landing page groups endpoints into categories but does not clarify which category or function this particular wire endpoint serves. Prospective callers should be aware that the actual behavior behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","premium API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","The specific function of /api/v1/wire/192 is unknown; 'Premium API Access' is the only description","No OpenAPI schema or request/response examples provided","No information on what data or service is returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/192","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this specific endpoint does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,86,157 '000':153 '0x8335':136 '20':152 '2913':137 '300':167 '6':161 'Base network API' 'USDC pay-per-call' 'accept':116 'access':7,22,38,114 'actual':239 'advertis':148 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,95,113,176 'awar':236 'base':9,24,91,139,154 'behavior':240 'behind':241 'broad':48 'call':4,19,54 'caller':233 'catalog':49 'categori':218,224 'chain':125 'challeng':142 'clarifi':222 'classif':64 'commit':103 'confirm':143 'connect':184 'content':190 'contract':135 'convers':81 'cost':85 'data':57 'decim':162 'descript':202 'detail':201 'doc':174 'document':169 'embed':65 'endpoint':32,107,145,207,216,230,243 'estim':75 'exact':130 'exact-pay':129 'exampl':198 'exchang':70 'extrem':171 'feed':69 'financ':66 'function':226 'gas':74 'generat':82 'geocod':79 'given':158 'group':215 'host':46 'http':117 'http-post' 'i.e':156 'infer':60 'infrastructur':77 'key':96 'land':213 'limit':99 'list':110 'live':147 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'maxamountrequir':150 'micropayment API' 'minimum':102 'network':92 'no-api-key' 'no-rate-limit' 'on-chain':123 'openapi':194 'page':179,214 'particular':228 'pay':2,17,52 'pay-per-cal':1,16,51 'pay-per-call' 'payment':42,120,131,164 'per':3,18,53 'post':118 'premium':5,20,36,112 'premium API access' 'price':68,175 'prompt':186 'prospect':232 'protocol':43 'provid':35 'quot':73 'rate':71,98 'readm':178 'render':181 'request':84,119 'request/response':197 'requir':104 'return':209 'schema':195 'scheme':132 'second':168 'sentiment':61 'serv':231 'settl':122 'site':45,211 'span':56 'spars':172 'specif':106,208 'summar':63 'timeout':165 'token':72 'undocu':245 'unit':155 'usdc':15,30,88,134,159 'usdc-base' 'use':133 'util':78 'valid':80 'via':10,25,39,126 'wallet':185 'web3':67 'wire':229 'x402':11,26,41,128,141 'x402 API' 'x402-payment'","prices":[{"id":"ed168943-bcdf-4b5a-ad2b-63a7995547b2","listingId":"aa524ce8-5320-469a-9d41-7ed10f25ecab","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:59.825Z"}],"sources":[{"listingId":"aa524ce8-5320-469a-9d41-7ed10f25ecab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/192","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:59.825Z","lastSeenAt":"2026-04-22T13:32:00.213Z"}],"details":{"listingId":"aa524ce8-5320-469a-9d41-7ed10f25ecab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/192 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/192"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/192"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-chain micropayment settlement per request","Exploring a multi-category API marketplace (data, AI, finance, utilities) with uniform pricing"],"bestFor":["Developers or agents wanting frictionless pay-per-call access without subscriptions","Use cases requiring USDC micropayments on Base L2","Callers who prefer no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume callers who would benefit from bulk pricing or subscription plans","Anyone requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.522Z"},"updatedAt":"2026-04-22T13:32:00.213Z"}}