{"id":"297225f4-bdbb-4182-982c-fa1b9e865230","shortId":"6QtCVc","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 a transaction receipt resource (transaction ID 175) 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 settlement on the Base network using USDC.\n\nThe specific endpoint probed (`/api/v1/transactions/175/receipt`) returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base. Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised flat pricing. Payment is made via the x402 \"exact\" scheme, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 responding with a proper 402 challenge, but without documentation it is difficult to know what fields the receipt includes or what input body (if any) the POST expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","per-call-pricing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt","payment receipt","x402 api","lowpaymentfee","pay-per-call api","USDC micropayment","Base network API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/175/receipt is not listed among the site's advertised APIs — its purpose and response format are unknown","Request body schema for the POST is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/175/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/175/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on request format, response schema, or what the receipt contains. All doc pages render only a wallet-connect prompt. The specific endpoint path (/transactions/175/receipt) is not listed on the homepage, making its purpose unclear beyond the generic 'Premium API Access' 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'/api/v1/transactions/175/receipt':104 '/docs':167 '/pricing':168 '/readme':171 '0.02':82,130 '000':114 '0x8335':119 '175':38 '20':113 '300':151 '402':212 '6':125 'Base network API' 'USDC micropayment' 'accept':156 'actual':201 'advertis':47,138 'ai/ml':55 'analysi':58 'analyt':54 'api':51,87 'application/json':161 'base':5,18,96,115,121 'base-network' 'behind':39 'bodi':230 'broader':44 'call':9,22,132 'challeng':109,213 'classif':60 'connect':177 'consist':133 'contain':202 'content':183 'convers':77 'data':53 'decim':126 'difficult':219 'document':162,192,216 'embed':61 'endpoint':3,16,28,102,155,204 'estim':71 'exact':147 'exampl':195 'exchang':66 'expect':235 'extrem':164 'feed':65 'field':223 'financ':62 'flat':139 'gas':70 'generat':78 'geocod':75 'id':37 'includ':226 'infer':56 'infrastructur':73 'input':229 'key':88 'know':221 'limit':91 'live':206 'lowpaymentfee' 'lowpaymentfee.com':30,45 'made':143 'network':97 'no-api-key' 'openapi':187 'page':172 'paid':6,19 'pay-per-call api' 'payload':200 'payment':141 'payment receipt' 'paywal':42 'per':8,21,83,131 'per-cal':7,20 'per-call-pricing' 'platform':46 'post':157,234 'price':64,80,140 'probe':103 'prompt':179 'proper':211 'provid':31 'quot':69 'rate':67,90 'receipt':2,15,34,199,225 'render':174 'request':84,110,158 'request/response':190 'resourc':35 'respond':208 'return':105,160 'schema':191 'scheme':148 'second':152 'sentiment':57 'settlement':93 'sinc':122 'site':136 'span':52 'spars':165 'spec':188 'specif':101 'suit':49 'summar':59 'timeout':153 'token':68 'transact':1,14,33,36 'transaction receipt' 'transaction-receipt' 'translat':128 'unit':116 'usdc':13,26,99,118,123 'usdc-settlement' 'use':98,124 'util':74 'valid':76,107 'via':10,23,144 'wallet':178 'web3':63 'without':215 'x402':11,24,41,108,146 'x402 api' 'x402-payment'","prices":[{"id":"0320b543-72ad-4456-851b-fcb7ba53e1f2","listingId":"297225f4-bdbb-4182-982c-fa1b9e865230","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/175/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":"2026-04-18T18:58:54.565Z"}],"sources":[{"listingId":"297225f4-bdbb-4182-982c-fa1b9e865230","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/175/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:54.565Z","lastSeenAt":"2026-04-24T21:04:00.458Z"}],"details":{"listingId":"297225f4-bdbb-4182-982c-fa1b9e865230","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/175/receipt \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises all APIs at $0.02 per request with no API keys, no rate limits, on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/175/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 175 via a single paid API call","Demonstrating x402 pay-per-request protocol integration on Base","Programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call receipt retrieval on Base","Projects that want keyless, usage-based API access"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume receipt retrieval (no batch endpoint documented)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.72Z"},"updatedAt":"2026-04-24T21:04:00.458Z"}}