{"id":"18960ec7-ba38-4e50-aa20-f2c09e178838","shortId":"ms9gqG","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach an X-PAYMENT header with a signed USDC transfer, and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/235` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises four categories of APIs: 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). However, documentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There are no OpenAPI specs, no request/response schemas, and no usage examples available from the crawled content. The actual behavior and response format of this specific transactions endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all docs/pricing/README pages return only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/transactions/235 is undocumented","No request or response examples could be obtained","The broad API catalog is advertised but individual endpoint behavior is unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/235","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/transactions/235","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific '/transactions/235' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,141 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '0x8335':135 '20':128 '2913':136 '300':156 '402 payment api' '6':145 'accept':118 'access':116 'actual':242 'address':152 'advertis':124,162 'ai':174 'ai-inference' 'ai/ml':49 'analysi':178 'analyt':48,168 'api':5,20,37,71,115,166,207 'asset':134 'attach':87 'avail':236 'base':8,23,67,130,138 'base network api' 'behavior':243 'broad':42 'broader':160 'call':4,19 'caller':86 'catalog':43 'categori':164 'challeng':123 'classif':181 'classification' 'commit':79 'connect':216 'content':240 'convers':198 'cost':58 'crawl':239 'crypto-quotes' 'data':47,52,167,171 'data-analytics' 'decim':146 'detail':223 'direct':150 'doc':206 'document':201 'embed':182 'embeddings' 'enabl':36 'endpoint':45,57,108,251 'equal':140 'estim':192 'everi':56 'exampl':235 'exchang':187 'export':172 'extrem':203 'feed':186 'financ':183 'finance-data' 'finance/web3':51 'format':246 'four':163 'fulfil':101 'gas':191 'generat':199 'geocod':196 'geocoding' 'given':142 'handl':83 'header':92 'howev':200 'infer':50 'infrastructur':194 'inlin':85 'insight':173 'key':72 'learn':176 'limit':75 'list':112 'low payment fee' 'lowpaymentfee.com':31 'machin':175 'maxamountrequir':126 'metric':169 'micropayment api' 'network':9,24,68 'offer':40 'openapi':227 'page':211 'paid':62 'pay':2,17 'pay per request api' 'pay-per-cal':1,16 'pay-per-call' 'payment':84,91,148 'per':3,18,60 'platform':6,21,38,161 'post':119 'premium':114 'price':185,208 'prompt':218 'protocol':82 'quot':190 'rate':74,188 'readm':210 'render':213 'report':170 'request':61,103,120 'request/response':230 'respons':245 'schema':231 'second':157 'sentiment':177 'sentiment-analysis' 'server':100 'servic':55 'sign':95 'span':46 'spec':228 'specif':107,249 'summar':180 'technic':222 'text':179 'text-summarization' 'thin':204 'timeout':158 'token':189 'transact':250 'transfer':97 'unit':131 'unknown':253 'upfront':78 'upon':104 'usag':234 'usdc':15,30,64,96,133,143 'usdc api' 'usdc-base' 'util':54,195 'utility-services' 'valid':197 'verif':105 'via':10,25 'wallet':217 'web3':184 'x':90 'x-payment':89 'x402':11,26,35,81,122 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2f7c20dc-e94c-40fa-8ba4-2167d3d43282","listingId":"18960ec7-ba38-4e50-aa20-f2c09e178838","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/transactions/235","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:27.619Z"}],"sources":[{"listingId":"18960ec7-ba38-4e50-aa20-f2c09e178838","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/235","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:27.619Z","lastSeenAt":"2026-04-22T21:31:38.205Z"}],"details":{"listingId":"18960ec7-ba38-4e50-aa20-f2c09e178838","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/235 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/235"},{"claim":"Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding or data validation utilities with instant USDC micropayments","Exporting analytics data or generating reports via pay-as-you-go endpoints"],"bestFor":["Developers who want zero-signup, pay-per-call API access","Agents and bots that can settle payments via x402 on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring high-throughput bulk access at volume-discounted pricing","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.136Z"},"updatedAt":"2026-04-22T21:31:38.205Z"}}