{"id":"665cd92f-905c-4dae-9b66-6e74a29b8f2f","shortId":"BDcTpC","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/178` is listed as \"Premium API Access\" and accepts HTTP POST requests. Payment is settled on-chain via the x402 exact-payment scheme: the caller attaches an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) to the payTo address on Base. The response MIME type is application/json. The x402 challenge was captured live and confirms the endpoint is operational.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The name \"Premium API Access\" and the path `/api/v1/wire/178` do not clearly indicate what data or functionality this specific endpoint provides, making it difficult to determine its exact purpose without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-response","no-api-key","http-post"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","wire API"],"warnings":["No OpenAPI or schema documentation available — endpoint purpose is unclear","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/wire/178 ('Premium API Access') is not described anywhere","No request body schema or response schema documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/178","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/178","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 the endpoint is operational with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/wire/178 is unclear. The docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,86,153 '000':150 '20':149 '6':157 'Base network API' 'USDC pay-per-call' 'accept':116 'access':7,22,38,114,227 'actual':221 'address':162 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,95,113,189,226 'application/json':170 'attach':135 'base':9,24,91,151,164 'broad':48 'call':4,19,54 'caller':134 'captur':175 'catalog':49 'chain':125 'challeng':173 'classif':64 'clear':234 'commit':103 'confirm':178 'connect':198 'contain':141 'content':204 'convers':81 'cost':85 'data':57,237 'decim':158 'determin':248 'difficult':246 'doc':188 'document':183,213 'embed':65 'endpoint':32,107,180,220,242 'estim':75 'exact':130,250 'exact-pay':129 'exampl':216 'exchang':70 'extrem':185 'feed':69 'financ':66 'function':239 'gas':74 'generat':82 'geocod':79 'header':140 'host':46 'http':117 'http-post' 'indic':235 'infer':60 'infrastructur':77 'json-response' 'key':96 'limit':99 'list':110 'live':176 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'make':244,253 'micropayment API' 'mime':167 'minimum':102 'name':224 'network':92 'no-api-key' 'on-chain':123 'openapi':208 'oper':182 'page':193 'paid':255 'path':230 'pay':2,17,52 'pay-per-cal':1,16,51 'pay-per-call' 'payment':42,120,131,139,145 'payto':161 'per':3,18,53 'post':118 'premium':5,20,36,112,225 'price':68,190 'prompt':200 'protocol':43 'provid':35,243 'purpos':251 'quot':73 'rate':71,98 'readm':192 'render':195 'request':84,119,256 'request/response':211 'requir':104 'respons':166 'return':222 'schema':212 'scheme':132 'sentiment':61 'settl':122 'sign':143 'sinc':154 'site':45 'span':56 'spars':186 'spec':209 'specif':106,241 'summar':63 'token':72 'type':168 'unit':152 'usdc':15,30,88,144,155 'usdc-base' 'use':156 'util':78 'valid':80 'via':10,25,39,126 'wallet':199 'web3':67 'wire API' 'without':252 'x':138 'x-payment':137 'x402':11,26,41,128,172 'x402 API' 'x402-payment'","prices":[{"id":"5898e0e1-40df-4e45-8afc-8546ba8ff821","listingId":"665cd92f-905c-4dae-9b66-6e74a29b8f2f","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:44.735Z"}],"sources":[{"listingId":"665cd92f-905c-4dae-9b66-6e74a29b8f2f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:44.735Z","lastSeenAt":"2026-04-22T05:31:49.871Z"}],"details":{"listingId":"665cd92f-905c-4dae-9b66-6e74a29b8f2f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/178 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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/178"},{"claim":"All APIs 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":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/178"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.326Z"},"updatedAt":"2026-04-22T05:31:49.871Z"}}