{"id":"3089126c-daec-4d58-9680-ac895fa9aec6","shortId":"37SU9z","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" transaction receipt resource via the x402 payment protocol. It is part of a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities—all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/transactions/50/receipt` accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The x402 challenge confirms the endpoint is live and uses the \"exact\" payment scheme with a 300-second timeout.\n\nDocumentation on the site is extremely sparse—most pages beyond the landing page only show a \"Connect wallet\" prompt. There is no OpenAPI spec, no detailed request/response schema, and no examples of what the receipt payload actually contains. The endpoint's purpose (retrieving a receipt for transaction ID 50) can be inferred from the URL structure, but the actual response format and required request body are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 endpoint","USDC micropayment API","Base network API","pay-per-request","lowpaymentfee","crypto payment API","402 payment protocol"],"warnings":["No OpenAPI or schema documentation available","Response format and required request body are completely undocumented","Most documentation pages only show 'Connect wallet' with no content","The specific purpose of 'transaction 50 receipt' is unclear—may be a demo/placeholder endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/50/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/50/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing and network details. However, there is no OpenAPI spec, no documentation of request/response schemas, no examples, and the actual functionality of the receipt endpoint is only inferable from the URL path. Most site pages return only a wallet-connect 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'/request':17,34 '0.02':16,33,77,122 '000':118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':111 '20':117 '300':144 '402 payment protocol' '50':195 '6':126 'Base network API' 'USDC micropayment API' 'accept':95 'access':43 'actual':183,205 'ai':66 'amount':115 'analyt':65 'api':42,61,82 'base':9,26,106,119 'base-network' 'beyond':156 'bodi':211 'broader':57 'call':4,21 'categori':62 'challeng':130 'commit':89 'confirm':131 'connect':163 'contain':184 'contract':110 'crypto payment API' 'data':64 'decim':127 'detail':172 'document':147 'endpoint':7,24,36,93,133,186 'exact':139 'exampl':177 'extrem':152 'financ':69 'format':207 'given':123 'i.e':121 'id':194 'includ':63 'infer':198 'infrastructur':72 'json':100 'json-response' 'key':83 'land':158 'learn':68 'limit':86 'live':135 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':67 'maximum':114 'multipl':60 'network':107 'no-api-key' 'offer':59 'openapi':169 'page':155,159 'part':54 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request' 'payload':182 'payment':50,101,140 'per':3,20,78 'platform':58 'post':96 'premium':41 'price':75 'prompt':165 'protocol':51 'provid':39 'purpos':188 'rate':85 'receipt':6,23,45,181,191 'request':79,97,210 'request/response':173 'requir':90,209 'resourc':46 'respons':206 'retriev':189 'return':99 'schema':174 'scheme':141 'second':145 'settl':12,29,103 'show':161 'site':150 'spars':153 'spec':170 'specif':92 'structur':202 'timeout':146 'transact':5,22,44,193 'transaction receipt API' 'transaction-receipt' 'unit':120 'unknown':213 'url':201 'usdc':14,31,109,124 'usdc-settlement' 'use':108,137 'util':73 'via':10,27,47 'wallet':164 'web3':70 'x402':11,28,49,129 'x402 endpoint' 'x402-payment'","prices":[{"id":"8019c958-4af7-4159-9891-45374b944412","listingId":"3089126c-daec-4d58-9680-ac895fa9aec6","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/50/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":"2026-04-18T19:26:53.842Z"}],"sources":[{"listingId":"3089126c-daec-4d58-9680-ac895fa9aec6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/50/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:53.842Z","lastSeenAt":"2026-04-24T04:04:20.458Z"}],"details":{"listingId":"3089126c-daec-4d58-9680-ac895fa9aec6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/50/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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/50/receipt"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/50/receipt"}],"useCases":["Retrieving transaction receipts programmatically with per-call USDC payment","Integrating pay-per-use API access without traditional API key management","Building agent workflows that settle API costs on-chain via x402"],"bestFor":["Developers wanting keyless, pay-per-call API access on Base","AI agents that can settle x402 payments autonomously","Projects needing low-cost ($0.02) on-chain settled API calls"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume use cases where per-call crypto settlement overhead is impractical","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.649Z"},"updatedAt":"2026-04-24T04:04:20.458Z"}}