{"id":"5e813883-53af-4abe-9884-041654b34a20","shortId":"YWeHcs","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/wire/114` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to the specified payTo address, with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page 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 usage examples available from the crawl. The exact functionality behind the \"Premium API Access\" label at `/api/v1/wire/114` is unclear; it does not map to any of the named endpoints listed on the homepage. Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or direct contact with the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available beyond the landing page — /docs, /pricing, /api, /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The endpoint path /api/v1/wire/114 does not match any of the named endpoints listed on the homepage; its actual functionality is unknown","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/114","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/wire/114 ('Premium API Access') is undocumented and does not correspond to any named endpoint on the 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'/api/v1/wire/114':123,235 '/docs':191 '/pricing':193 '/readme':195 '/request':19,38 '0.02':18,37,95,151 '000':141 '0x8335':146 '20':140 '300':171 '402 payment api' '6':155 'accept':176 'access':129,232 'across':54 'address':168 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,128,231 'application/json':181 'avail':221 'awar':256 'base':8,27,103,142,148 'base network api' 'behind':228 'beyond':183 'broad':50 'call':4,23 'caller':253 'catalog':51 'categori':56 'challeng':135 'classif':71 'classification' 'commit':118 'connect':201 'contact':267 'content':207 'convers':88 'crawl':224 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':156 'direct':266 'document':182,216,259 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,175,247 'equal':150 'estim':82 'exact':162,226 'exampl':220 'exchang':77 'experiment':264 'export':62 'expos':48 'extrem':188 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':227 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':152 'homepag':251 'http':177 'infrastructur':84 'input/output':260 'insight':63 'integr':262 'key':111 'label':233 'land':185 'learn':66 'limit':114 'list':125,248 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':159 'map':241 'maxamountrequir':138 'metric':59 'micropayment api' 'name':246 'network':104 'offer':10,29 'openapi':211 'page':186,196 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':157 'payto':167 'per':3,22,96 'platform':6,25,46 'post':178 'premium':127,230 'price':75,93 'prompt':203 'prospect':252 'protocol':108 'provid':270 'quot':80 'rate':78,113 'render':198 'report':60 'request':97 'request/response':214 'requir':263 'return':131,180 'schema':215,261 'scheme':163 'second':172 'sentiment':67 'sentiment-analysis' 'spars':189 'spec':212 'specif':120 'specifi':166 'summar':70 'text':69 'text-summarization' 'timeout':173 'token':79 'unclear':237 'unit':143 'upfront':117 'usag':219 'usdc':9,28,100,145,153 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87,133 'via':105,160 'wallet':202 'web3':74 'without':258 'x402':43,107,134 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"affbff8c-f23f-4247-9b45-117e9e5967a3","listingId":"5e813883-53af-4abe-9884-041654b34a20","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:31.894Z"}],"sources":[{"listingId":"5e813883-53af-4abe-9884-041654b34a20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/114","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:31.894Z","lastSeenAt":"2026-04-22T07:01:43.398Z"}],"details":{"listingId":"5e813883-53af-4abe-9884-041654b34a20","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/114 \\\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":"All endpoints 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 x402 challenge for /api/v1/wire/114 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/114"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates via pay-as-you-go calls","Geocoding and data validation as utility microservices"],"bestFor":["AI agents that need keyless, pay-per-use API access","Developers wanting to avoid subscription commitments for low-volume API usage","Web3-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on Base or unfamiliar with x402 payment flows","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.973Z"},"updatedAt":"2026-04-22T07:01:43.398Z"}}