{"id":"da7553ed-b8bb-4c03-83ed-7fd9cb4c4f3d","shortId":"cMgrf9","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 settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/113` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach a cryptographic payment header and receive the response immediately.\n\nThe wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing with no rate limits or minimum commitments.\n\nThe specific `/api/v1/messages/113` endpoint accepts HTTP POST requests and returns `application/json`. Beyond the generic \"Premium API Access\" label, there is no documentation describing the request body schema, response format, or what data this particular endpoint returns. The platform's docs, pricing, and README pages all gate behind a wallet-connect flow, so no further technical detail was available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid endpoint","402 payment API"],"warnings":["No request or response schema available — the purpose of /api/v1/messages/113 is unknown beyond the generic label 'Premium API Access'","Documentation, pricing, and README pages are gated behind a wallet-connect flow and returned no useful content","No OpenAPI specification or ai-plugin manifest found","The endpoint's actual functionality cannot be verified without making a paid call"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/113","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/messages/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request/response schemas, no OpenAPI spec, and the endpoint name 'Premium API Access' is entirely generic. The crawl yielded only a landing page listing many endpoints without technical detail; docs pages required wallet connection and returned no 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'/request':19,38,165 '0.02':18,37,80,164 '000':84 '20':83 '402 payment API' '6':90 'Base network API' 'USDC micropayment API' 'accept':178 'access':75,190 'account':102 'advertis':121 'ai':12,31,132 'analysi':136 'analyt':126 'api':5,24,45,74,100,189 'application/json':184 'attach':108 'avail':232 'base':8,27,63,85 'behind':220 'beyond':185 'bodi':199 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':124 'classif':139 'commit':173 'connect':224 'convers':156 'cost':77 'crawl':235 'crypto-paid endpoint' 'cryptograph':110 'data':11,30,125,129,205 'decim':91 'describ':196 'detail':230 'doc':213 'document':195 'embed':140 'enabl':44 'endpoint':16,35,57,67,123,160,177,208 'estim':150 'exchang':145 'export':130 'feed':144 'financ':13,32,141 'flow':225 'format':202 'four':122 'gas':149 'gate':219 'generat':157 'generic':187 'geocod':154 'handl':94 'header':112 'http':179 'http-post' 'immedi':117 'infrastructur':152 'insight':131 'json-response' 'key':101 'label':191 'learn':134 'limit':170 'list':71,159 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':133 'metric':127 'minimum':172 'network':64 'no-api-key' 'no-rate-limit' 'offer':10,29 'page':217 'particular':207 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,111 'per':3,22,55,81 'platform':6,25,46,120,211 'post':180 'premium':73,188 'price':143,166,214 'protocol':98 'provid':48 'quot':148 'rate':146,169 'readm':216 'receiv':114 'report':128 'request':56,181,198 'requir':106 'respons':116,201 'return':183,209 'schema':200 'sentiment':135 'settl':58 'share':161 'specif':66,175 'subscript':104 'summar':138 'technic':229 'text':137 'token':147 'unit':86 'usdc':9,28,60,88 'usdc-base' 'util':15,34,153 'valid':155 'via':95 'wallet':223 'wallet-connect':222 'web3':142 'wider':119 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"41abc51e-0b81-4c36-9a3b-d159646876ea","listingId":"da7553ed-b8bb-4c03-83ed-7fd9cb4c4f3d","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/messages/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.715Z"}],"sources":[{"listingId":"da7553ed-b8bb-4c03-83ed-7fd9cb4c4f3d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/113","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.715Z","lastSeenAt":"2026-04-22T04:02:39.362Z"}],"details":{"listingId":"da7553ed-b8bb-4c03-83ed-7fd9cb4c4f3d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/113 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/113"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints 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/messages/113"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using on-chain USDC payments","Integrating pay-as-you-go endpoints into workflows that settle on Base L2"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with USDC wallets on Base that need to call APIs autonomously","Prototyping integrations where subscription commitments are undesirable"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.183Z"},"updatedAt":"2026-04-22T04:02:39.362Z"}}