{"id":"77f88854-ac63-4f59-9a0c-b320a0b1b518","shortId":"acMDtL","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/99` is listed as \"Premium API Access.\" Its x402 challenge confirms it accepts POST requests and charges a maximum of 20,000 base-unit USDC (i.e., $0.02, since USDC uses 6 decimals) per call, settled to a wallet on Base. The response MIME type is `application/json`. Beyond the generic \"Premium API Access\" label, no further documentation describes what this particular messages endpoint returns or what input it expects.\n\nThe broader platform advertises categories including sentiment analysis, text summarization, classification, embeddings, metrics, reports, data export, insights, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed parameter docs, or example responses are available for any of these endpoints.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","402 payment api"],"warnings":["No documentation exists for the /api/v1/messages/99 endpoint — its purpose and expected input/output are unknown.","No OpenAPI or JSON schema is provided for any endpoint on the platform.","The broader platform lists many endpoints but none have detailed docs; functionality is unverifiable.","The /pricing, /api, and /README pages returned no meaningful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/99","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/99","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 challenge, confirming pricing and network. However, there is no OpenAPI schema, no documentation of request/response formats, no example payloads, and the 'Premium API Access' label is entirely generic. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':18,36 '0.02':17,35,68,135,211 '000':129 '20':128 '402 payment api' '6':139 'accept':120 'access':114,160 'advertis':180 'ai':11,29 'ai/ml':55 'analysi':184 'analyt':12,30,54 'api':5,23,43,85,113,159 'application/json':154 'attach':96 'avail':225 'base':8,26,76,131,148 'base network api' 'base-unit':130 'beyond':155 'broad':48 'broader':178 'call':4,22,142 'caller':94 'categori':181 'challeng':117 'charg':124 'classif':187 'collect':49 'commit':93 'confirm':118 'convers':204 'cover':10,28 'data':53,58,191 'decim':140 'describ':165 'detail':218 'doc':220 'document':164 'embed':188 'enabl':42 'endpoint':51,64,106,170,230 'estim':201 'everi':63 'exampl':222 'exchang':196 'expect':176 'export':192 'feed':195 'financ':13,31 'finance/web3':57 'gas':200 'general':60 'generat':206 'generic':157 'geocod':202 'header':100 'howev':214 'i.e':134 'includ':182 'infer':56 'infrastructur':61 'input':174 'insight':193 'json-api' 'key':86 'label':161 'limit':89 'list':110 'low payment fee' 'lowpaymentfee.com':37 'maximum':126 'messag':169 'metric':189 'micropayment api' 'mime':151 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':216 'paid':71 'paramet':219 'particular':168 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':99 'per':3,21,69,141 'platform':44,179 'point':213 'post':121 'post-method' 'premium':112,158 'price':66,194,212 'protocol':81 'quot':199 'rate':88,197 'report':190 'request':70,103,122 'respons':150,223 'return':171 'schema':217 'sentiment':183 'settl':143 'simpli':95 'sinc':136 'span':52 'specif':105 'suit':6,24 'summar':186 'text':185 'token':198 'type':152 'unit':132 'upfront':92 'usdc':9,27,73,133,137 'usdc api' 'usdc-base' 'use':138 'util':15,33,62 'valid':203 'via':78 'wallet':146 'x402':41,80,98,116 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"f53442d6-969c-4544-aa3a-467fd2b0b8e4","listingId":"77f88854-ac63-4f59-9a0c-b320a0b1b518","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.540Z"}],"sources":[{"listingId":"77f88854-ac63-4f59-9a0c-b320a0b1b518","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.540Z","lastSeenAt":"2026-04-22T02:32:08.675Z"}],"details":{"listingId":"77f88854-ac63-4f59-9a0c-b320a0b1b518","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/99 \\\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":"Endpoint returns HTTP 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/messages/99"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/99"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to a variety of utility and data endpoints with crypto micropayments","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers exploring x402 protocol integrations","AI agents needing keyless, pay-per-call API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Production workloads requiring well-documented, schema-validated APIs","Users who need fiat payment options or cannot transact in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.238Z"},"updatedAt":"2026-04-22T02:32:08.675Z"}}