{"id":"dee3b014-f99e-469f-9ca1-99cf1b4ffb15","shortId":"QKKCVc","kind":"x402","title":"Pay-per-call API platform on Base offering data, AI, finance, and utility endpoints at $0.02 each via x402.","tagline":"Pay-per-call API platform on Base offering data, AI, finance, and utility endpoints at $0.02 each via x402.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad set 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, paid in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint being listed here — `/api/v1/transactions/9/receipt` — is described as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns `application/json`. The payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.\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 additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular receipt endpoint actually returns. The endpoint path suggests it retrieves a receipt for transaction ID 9, but the exact payload structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","no-api-key","transaction-receipt"],"categories":["finance","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","transaction receipt API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'","The exact request body and response structure for this endpoint are undocumented","The endpoint path references a hardcoded transaction ID (9), which may indicate a demo or placeholder rather than a general-purpose API","No information on what 'Premium API Access' actually provides beyond the generic label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/9/receipt","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/9/receipt","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 network. However, there is no OpenAPI spec, no documentation of request/response schemas, no examples, and the docs pages are empty. The specific purpose of this 'transactions/9/receipt' endpoint is unclear beyond its 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'/api/v1/transactions/9/receipt':124 '/docs':190 '/pricing':192 '/readme':194 '0.02':17,37,97,145,148 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':174 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':180 '20':139 '402':134 '9':239 'Base network API' 'USDC pay-per-call' 'accept':159 'access':130 'across':56 'actual':226 'addit':205 'address':173 'ai':11,31,66 'analysi':70 'analyt':60 'api':5,25,47,109,129 'application/json':164 'base':8,28,105,141,150 'beyond':182 'broad':52 'call':4,24 'categori':58 'chain':171 'challeng':135,153 'classif':73 'commit':117 'confirm':154 'connect':200 'content':207 'contract':178 'convers':90 'crypto payment endpoint' 'data':10,30,59,63 'describ':126 'document':181,216 'embed':74 'enabl':46 'endpoint':15,35,55,93,120,156,225,229 'estim':84 'exact':242 'exampl':219 'exchang':79 'export':64 'expos':50 'extrem':187 'feed':78 'financ':12,32,75 'four':57 'gas':83 'generat':91 'geocod':88 'i.e':147 'id':238 'infrastructur':86 'insight':65 'json-api' 'key':110 'land':184 'learn':68 'limit':113 'list':122 'live':158 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':67 'metric':61 'micropayment API' 'minimum':116 'network':106 'no-api-key' 'offer':9,29 'on-chain':169 'openapi':211 'page':185,195 'paid':100 'particular':223 'path':230 'pay':2,22 'pay-per-cal':1,21 'pay-per-call' 'payload':243 'payment':166 'per':3,23,98 'platform':6,26,48 'post':160 'premium':128 'price':77,95 'prompt':202 'quot':82 'rate':80,112 'receipt':224,235 'render':197 'report':62 'request':99,136,161 'request/response':214 'retriev':233 'return':132,163,227 'schema':215 'sentiment':69 'set':53 'settl':168 'spars':188 'spec':212 'specif':119 'structur':244 'suggest':231 'summar':72 'technic':206 'text':71 'token':81 'transact':237 'transaction receipt API' 'transaction-receipt' 'unit':142 'unknown':246 'usdc':102,144,146,177 'usdc-base' 'use':175 'util':14,34,87 'valid':89 'via':19,39 'wallet':201 'web3':76 'x402':20,40,45,152 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"11971993-691d-472b-ac1b-84c8db1b24f8","listingId":"dee3b014-f99e-469f-9ca1-99cf1b4ffb15","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/9/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:13.680Z"}],"sources":[{"listingId":"dee3b014-f99e-469f-9ca1-99cf1b4ffb15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/9/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:13.680Z","lastSeenAt":"2026-04-23T23:32:53.899Z"}],"details":{"listingId":"dee3b014-f99e-469f-9ca1-99cf1b4ffb15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/9/receipt \\\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 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 requests maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/9/receipt"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/9/receipt"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipts via a pay-per-call model without API key registration","Integrating on-chain micropayment-gated endpoints into agent workflows","Accessing low-cost utility and data APIs settled in USDC on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing cheap per-call pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.663Z"},"updatedAt":"2026-04-23T23:32:53.899Z"}}