{"id":"9580740b-2af7-4219-8ec0-d72eb657607b","shortId":"N2f9Dv","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 226) 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/226/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 sparse: 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-payment","base-network","transaction-receipt","per-call-pricing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call API","crypto payment endpoint"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The specific content of the receipt response is unknown; 'Premium API Access' is a generic description","The broader platform advertises many endpoints (AI, finance, utils) but none were individually verified beyond this one"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/226/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/226/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schema, and no examples. The specific endpoint's purpose ('transaction receipt') is only inferable from the URL path and the generic title 'Premium API Access'. This is effectively a stub 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'/api/v1/transactions/226/receipt':100 '/docs':162 '/pricing':164 '/readme':166 '0.02':83,128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '20000':119 '226':39 '300':154 '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 'base-network' '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 endpoint' '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 'spars':160 'spec':183 'specif':97 'suit':50 'summar':60 'timeout':156 'token':69 'transact':1,14,35 'transaction receipt API' 'transaction-receipt' 'unclear':215 'unit':121 'usdc':13,26,111,123 'usdc-payment' '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":"7100203a-005e-4d41-935e-b00cac651b0a","listingId":"9580740b-2af7-4219-8ec0-d72eb657607b","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/226/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":"2026-04-18T18:59:18.713Z"}],"sources":[{"listingId":"9580740b-2af7-4219-8ec0-d72eb657607b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/226/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:18.713Z","lastSeenAt":"2026-04-24T17:03:04.611Z"}],"details":{"listingId":"9580740b-2af7-4219-8ec0-d72eb657607b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/226/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/226/receipt"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/226/receipt"},{"claim":"The platform lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction ID 226 via a micropayment","Demonstrating x402 protocol payment flows on Base with USDC","Integrating pay-per-call API access without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand transaction receipts without subscription","Projects wanting no-auth, pay-as-you-go API access on Base"],"notFor":["Bulk retrieval of many transaction receipts (no documented batch endpoint)","Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.619Z"},"updatedAt":"2026-04-24T17:03:04.611Z"}}