{"id":"12b25e8b-fa13-4dcb-b751-d1ed90b85f8d","shortId":"nuxqnE","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 provides a broad catalog of pay-per-request 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.\n\nThe specific endpoint `/api/v1/keys/27` is listed as \"Premium API Access\" and carries a max amount of 20,000 base units of USDC (0.02 USD, i.e., two cents). Payment is settled on-chain to address 0x1A2B...85F3 using USDC (contract 0x8335...2913) on Base. The platform advertises no API keys, no rate limits, no minimums, and instant access — users simply attach an x402 payment header to each request.\n\nDocumentation is minimal: the /api, /pricing, and /README pages all resolve to 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 crawled pages. The exact functionality behind the \"Premium API Access\" label at `/api/v1/keys/27` is unclear — it may be a meta-endpoint for obtaining access keys or a generic premium tier, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto pay API","on-demand API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no useful content","The exact functionality of /api/v1/keys/27 ('Premium API Access') is unclear — it may be a meta-endpoint rather than a data API","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/27","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/keys/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/keys/27 ('Premium API Access') is ambiguous. Effectively a stub 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'/api/v1/keys/27':116,229 '/pricing':186 '/readme':188 '/request':19,38 '0.02':18,37,99,135 '000':130 '0x1a2b':148 '0x8335':153 '20':129 '2913':154 '85f3':149 'Base network API' 'USDC API' 'access':122,170,226,241 'across':58 'address':147 'advertis':159 'ai':12,31,68 'ai-inference' 'amount':127 'analysi':72 'analyt':62 'api':5,24,45,121,161,225 'attach':173 'avail':214,254 'base':8,27,107,131,156 'behind':222 'broad':50 'call':4,23 'cannot':250 'carri':124 'catalog':51 'categori':60 'cent':139 'chain':145 'classif':75 'confirm':252 'connect':194 'content':200 'contract':152 'convers':92 'conversion' 'crawl':217 'crypto pay API' 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'document':181,209 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,238 'estim':86 'exact':220 'exampl':213 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':221 'gas':85 'gas-estimates' 'generat':93 'generic':245 'geocod':90 'geocoding' 'header':177 'i.e':137 'infrastructur':88 'insight':67 'instant':169 'key':162,242 'label':227 'learn':70 'limit':165 'list':118 'low fee API' 'lowpaymentfee.com':39 'machin':69 'materi':255 'max':126 'may':233 'meta':237 'meta-endpoint':236 'metric':63 'micropayment API' 'minim':183 'minimum':167 'network':108 'obtain':240 'offer':10,29 'on-chain':143 'on-demand API' 'openapi':204 'page':189,218 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payabl':102 'payment':140,176 'per':3,22,55,100 'per-request-billing' 'platform':6,25,46,158 'premium':120,224,246 'price':79,97 'prompt':196 'protocol':112 'provid':48 'quot':84 'rate':82,164 'report':64 'request':56,101,180 'request/response':207 'resolv':191 'schema':208 'sentiment':71 'sentiment-analysis' 'settl':142 'simpli':172 'spec':205 'specif':114 'summar':74 'text':73 'text-classification' 'text-summarization' 'tier':247 'token':83 'two':138 'unclear':231 'unit':132 'usag':212 'usd':136 'usdc':9,28,104,134,151 'usdc-base' 'use':150 'user':171 'util':15,34,89 'valid':91 'validation' 'via':109 'wallet':195 'web3':78 'x402':43,111,175 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"aaa93829-37d5-45b6-bc79-cf9ee995829d","listingId":"12b25e8b-fa13-4dcb-b751-d1ed90b85f8d","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/keys/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.193Z"}],"sources":[{"listingId":"12b25e8b-fa13-4dcb-b751-d1ed90b85f8d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.193Z","lastSeenAt":"2026-04-22T09:02:14.547Z"}],"details":{"listingId":"12b25e8b-fa13-4dcb-b751-d1ed90b85f8d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/27 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/keys/27 specifies maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/27"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/27"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that prefer on-chain USDC settlement over traditional billing"],"notFor":["High-volume production workloads where per-call crypto payment overhead is impractical","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Teams without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.261Z"},"updatedAt":"2026-04-22T09:02:14.547Z"}}