{"id":"387f3340-a02c-4072-b2a1-6c942483585f","shortId":"h2L2kt","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource ID 352) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint probed (`/api/v1/transactions/352/receipt`) returns a valid x402 challenge on POST, accepting payment in USDC on the Base network. The `maxAmountRequired` is 20000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's advertised flat pricing. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact-amount scheme with a 300-second timeout.\n\nDocumentation is extremely thin: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The endpoint is live and the x402 challenge is well-formed, but without documentation it is unclear what fields the receipt response includes or what input parameters (if any) the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","transaction-receipt","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request body and response structure are unknown.","The specific endpoint (/api/v1/transactions/352/receipt) is a hardcoded resource ID — unclear if this is a demo or a real transaction receipt.","The platform advertises many API categories (AI, analytics, finance, utils) but no evidence of actual functionality behind them was found in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/352/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/352/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 well-formed x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples of what the receipt payload contains. The docs pages are all empty 'Connect wallet' 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'/api/v1/transactions/352/receipt':100 '/docs':162 '/pricing':164 '/readme':166 '0.02':83,128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '20000':119 '300':154 '352':39 '6':124 'Base network API' 'USDC micropayment API' 'accept':108 'access':32 'actual':196 'address':144 'advertis':48,134 'ai/ml':56 'amount':150 'analysi':59 'analyt':55 'api':52,88 'base':5,18,114,120 'behind':40 'bodi':230 'broader':45 'call':9,22 'chain':142 'challeng':105,205 'classif':61 'commit':95 'connect':172 'consist':129 'contain':197 'content':178 'convers':78 'crypto payment API' 'data':54 'decim':125 'document':157,187,212 'embed':62 'endpoint':3,16,28,98,199 'equal':127 'estim':72 'exact':149 'exact-amount':148 'exampl':190 'exchang':67 'expect':231 'extrem':159 'feed':66 'field':217 'financ':63 'flat':135 'form':209 'gas':71 'generat':79 'geocod':76 'id':38 'includ':221 'infer':57 'infrastructur':74 'input':224 'json-response' 'key':89 'limit':92 'live':201 'lowpaymentfee' 'lowpaymentfee.com':30,46 'maxamountrequir':117 'network':115 'no-api-key' 'on-chain':140 'openapi':182 'page':167 'paid':6,19 'paramet':225 'pay-per-call API' 'payload':195 'payment':109,137 'paywal':43 'per':8,21,84 'per-cal':7,20 'per-call-pricing' 'platform':47 'post':107,229 'price':65,81,136 'probe':99 'prompt':174 'provid':31 'quot':70 'rate':68,91 'receipt':2,15,36,194,219 'render':169 'request':85 'request/response':185 'resourc':37 'respons':220 'return':101 'schema':186 'scheme':151 'second':155 'sentiment':58 'settl':139 'site':132 'span':53 'spec':183 'specif':97 'suit':50 'summar':60 'thin':160 'timeout':156 'token':69 'transact':1,14,35 'transaction receipt API' 'transaction-receipt' 'unclear':215 'unit':121 'usdc':13,26,111,123 'usdc-base' 'use':146 'util':75 'valid':77,103 'via':10,23 'wallet':173 'web3':64 'well':208 'well-form':207 'without':211 'x402':11,24,42,104,204 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"f9956290-c3b5-4070-851d-119a65a5b981","listingId":"387f3340-a02c-4072-b2a1-6c942483585f","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/352/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":"2026-04-18T19:26:20.481Z"}],"sources":[{"listingId":"387f3340-a02c-4072-b2a1-6c942483585f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/352/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:20.481Z","lastSeenAt":"2026-04-24T07:32:36.684Z"}],"details":{"listingId":"387f3340-a02c-4072-b2a1-6c942483585f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/352/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to proceed.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/352/receipt"},{"claim":"The platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/352/receipt"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/transactions/352/receipt"},{"claim":"The /docs, /api, /pricing, and /README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt by paying $0.02 in USDC on Base","Programmatic access to paid API endpoints without API key management","Agent-driven micropayment workflows using x402 protocol"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, on-demand API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-call crypto settlement adds overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.231Z"},"updatedAt":"2026-04-24T07:32:36.684Z"}}