{"id":"a1542cb8-a2ea-4a5e-888b-7060f405ada9","shortId":"su4SrA","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, payable in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, payable in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction ID 264) behind an x402 paywall. The parent site lowpaymentfee.com advertises a broad suite of pay-per-request APIs spanning data & analytics, AI/ML (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 priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/transactions/264/receipt) returns a valid x402 challenge with maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the \"exact\" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 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 site advertises no API keys, no rate limits, and instant access, but the lack of documentation makes it difficult to know what data any of these endpoints actually return.","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 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint is for a single transaction ID (264); unclear if this is a demo or a real resource","No response schema or example available; unknown what the receipt payload contains","The broader site advertises many API categories (AI, finance, analytics, etc.) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/264/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/264/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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of this receipt endpoint (transaction 264) is unclear. The broader site lists many endpoints but provides no detail on any of 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'/api/v1/transactions/264/receipt':108 '/docs':163 '/pricing':164 '/readme':167 '0.02':90,129 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x8335':123 '20':117 '264':40 '2913':124 '300':147 '6':133 'Base network API' 'USDC micropayment API' 'accept':152 'access':32,210 'actual':197,227 'advertis':49,201 'ai/ml':62 'analysi':64 'analyt':61 'api':58,203 'application/json':157 'base':8,21,98,119,126 'base-network' 'behind':41 'broad':51 'challeng':113 'classif':66 'connect':173 'contain':198 'content':179 'convers':83 'data':60,222 'decim':134 'difficult':218 'document':158,188,215 'embed':67 'endpoint':6,19,28,86,106,151,226 'equal':128 'estim':77 'exact':140 'exampl':191 'exchang':72 'extrem':160 'feed':71 'financ':68 'gas':76 'gate':3,16 'generat':84 'geocod':81 'given':130 'id':39 'infrastructur':79 'instant':209 'key':204 'know':220 'lack':213 'limit':207 'lowpaymentfee' 'lowpaymentfee.com':30,48 'made':137 'make':216 'maxamountrequir':115 'network':99 'no-api-key' 'openapi':183 'page':168 'parent':46 'pay':55 'pay-per-call API' 'pay-per-request':54 'payabl':9,22 'payload':196 'payment':135 'paywal':44 'per':12,25,56,91 'post':153 'price':70,88 'probe':107 'prompt':175 'protocol':103 'provid':31 'quot':75 'rate':73,206 'receipt':5,18,37,195 'render':170 'request':13,26,57,92,154 'request/response':186 'return':109,156,228 'schema':187 'scheme':141 'second':148 'sentiment':63 'settl':93 'site':47,200 'span':59 'spars':161 'spec':184 'specif':35,105 'suit':52 'summar':65 'timeout':149 'token':74 'transact':4,17,36,38 'transaction receipt API' 'transaction-receipt' 'unit':120 'usdc':11,24,95,122,131 'usdc-settlement' 'util':80 'valid':82,111 'via':100,138 'wallet':143,174 'web3':69 'x402':2,15,43,102,112 'x402 paid API' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"a19ff0ec-cec3-471f-8757-7a8d8509100a","listingId":"a1542cb8-a2ea-4a5e-888b-7060f405ada9","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/264/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":"2026-04-18T18:59:36.020Z"}],"sources":[{"listingId":"a1542cb8-a2ea-4a5e-888b-7060f405ada9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/264/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:36.020Z","lastSeenAt":"2026-04-24T14:33:33.475Z"}],"details":{"listingId":"a1542cb8-a2ea-4a5e-888b-7060f405ada9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/264/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/264/receipt"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/264/receipt"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 264 via programmatic x402 payment","Demonstrating x402 protocol integration with USDC on Base","Agent-driven micropayment API consumption without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-per-request API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","Anyone needing bulk or batch transaction receipt retrieval"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.785Z"},"updatedAt":"2026-04-24T14:33:33.475Z"}}