{"id":"4d94a500-9461-470b-8e4a-2fd54c348137","shortId":"bX6jjL","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction ID 347) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request, settled in USDC on the Base network.\n\nThe probed endpoint specifically returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through on-chain payment.\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 usage examples available from the crawl. The specific nature of the data returned by the /transactions/347/receipt endpoint is unclear beyond the generic \"Premium API Access\" label and application/json MIME type.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific data returned by /transactions/347/receipt is undocumented — 'Premium API Access' is a generic label","The broader platform lists many API categories (AI, finance, analytics, etc.) but none have documented request/response formats","Cannot verify whether the listed AI/analytics/finance endpoints actually function or are placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/347/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/347/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 challenge with clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific receipt endpoint is unclear. The broader platform lists many endpoints but provides no detail on any of 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'/docs':176 '/pricing':177 '/readme':180 '/transactions/347/receipt':219 '0.02':93,131 '000':115 '0x8335':120 '20':114 '2913':121 '300':151 '347':42 '6':127 'Base network API' 'USDC micropayment API' 'access':34,162,228 'advertis':51,139,161 'ai':63 'analysi':67 'analyt':62 'api':59,155,227 'application/json':231 'avail':206 'base':8,22,101,116,123 'base-network' 'behind':43 'beyond':223 'broader':48 'call':12,26,133 'chain':169 'challeng':110 'classif':69 'connect':186 'consist':134 'content':192 'convers':86 'crawl':209 'data':61,215 'decim':128 'document':171,201 'embed':70 'endpoint':6,20,30,89,105,220 'equal':130 'estim':80 'exact':147 'exampl':205 'exchang':75 'extrem':173 'feed':74 'financ':71 'gas':79 'gate':3,17 'generat':87 'generic':225 'geocod':84 'grant':164 'id':41 'infrastructur':82 'key':156 'label':229 'learn':65 'limit':159 'list':91 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'made':143 'mime':232 'natur':212 'network':102 'no-api-key' 'on-chain':167 'openapi':196 'page':181 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payment':141,170 'paywal':46 'per':11,25,57,94,132 'per-cal':10,24 'platform':50 'premium':226 'price':73,140 'probe':104 'prompt':188 'provid':33 'pure':165 'quot':78 'rate':76,158 'receipt':5,19,39 'render':183 'request':58,95,111 'request/response':199 'return':107,216 'schema':200 'scheme':148 'second':152 'sentiment':66 'settl':96 'sinc':124 'site':137 'span':60 'spars':174 'spec':197 'specif':37,106,211 'suit':53 'summar':68 'timeout':153 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'type':233 'unclear':222 'unit':117 'usag':204 'usdc':14,28,98,119,125 'usdc-settlement' 'use':126 'util':83 'valid':85 'via':144 'wallet':187 'web3':72 'x402':2,16,45,109,146 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"71c7496d-6bca-44be-ae79-b9d97b789172","listingId":"4d94a500-9461-470b-8e4a-2fd54c348137","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/347/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":"2026-04-18T19:26:14.390Z"}],"sources":[{"listingId":"4d94a500-9461-470b-8e4a-2fd54c348137","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/347/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:14.390Z","lastSeenAt":"2026-04-24T08:03:43.638Z"}],"details":{"listingId":"4d94a500-9461-470b-8e4a-2fd54c348137","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/347/receipt\n# Returns 402 with x402 challenge. Supply X-PAYMENT header with valid USDC payment on Base to receive the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge requesting 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/347/receipt"},{"claim":"All endpoints are listed 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 platform advertises APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 347 via programmatic x402 payment","Demonstrating x402 protocol integration for pay-per-request API access","Agents autonomously purchasing API data using on-chain USDC micropayments"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that need to autonomously pay for API access without API keys","Low-volume, on-demand data retrieval without subscription commitments"],"notFor":["High-volume batch processing where per-request fees add up quickly","Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.453Z"},"updatedAt":"2026-04-24T08:03:43.638Z"}}