{"id":"c0e5c395-1e7d-4aa1-8584-9f83287781eb","shortId":"mTXZ7u","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02 per request in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt retrieval service for transaction #58. It is part of a broader platform offering multiple pay-per-call API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities—all priced at $0.02 per request.\n\nThe endpoint uses the x402 payment protocol on the Base network, accepting USDC (USD Coin) payments. The maxAmountRequired is 20000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof. The response is JSON (mimeType: application/json). The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse—the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload contains. The specific endpoint path suggests it returns a receipt for a particular transaction (ID 58), but the exact fields and use case are unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-call","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request","lowpaymentfee"],"warnings":["No API documentation available—all doc pages render only 'Connect wallet'","No OpenAPI or schema definition found","The endpoint path references a specific transaction ID (58), making its general utility unclear","No response schema or example responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/58/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/58/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 (returns 402 challenge correctly) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty. The specific purpose of this particular receipt endpoint (transaction 58) is 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'/docs':150 '/pricing':151 '/readme':154 '0.02':12,28,77,107 '20000':99 '58':47,200 '6':104 'Base network API' 'USDC micropayment API' 'accept':91 'access':41,139 'advertis':137 'ai':66 'analyt':65 'api':40,61,109 'application/json':134 'attach':118 'base':9,25,89,100 'broader':53 'call':4,20,60 'caller':116 'case':207 'categori':62 'coin':94 'commit':144 'connect':160 'contain':185 'data':64 'decim':105 'detail':167 'document':145,176 'endpoint':7,23,34,81,188 'equal':106 'exact':203 'exampl':179 'extrem':147 'field':204 'financ':69 'header':123 'id':199 'includ':63 'infrastructur':72 'instant':138 'json':132 'json-response' 'key':110 'learn':68 'limit':113 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':67 'maxamountrequir':97 'mimetyp':133 'minimum':142 'multipl':56 'network':90 'offer':55 'openapi':171 'page':155 'part':50 'particular':197 'path':189 'pay':2,18,58 'pay-per-cal':1,17,57 'pay-per-call' 'pay-per-request' 'payload':184 'payment':85,95,122,127 'per':3,13,19,29,59,78 'platform':54,136 'premium':39 'price':75 'prompt':162 'proof':128 'protocol':86 'provid':37 'rate':112 'receipt':6,22,42,183,194 'render':157 'request':14,30,79 'request/response':174 'requir':115 'respons':130 'retriev':43 'return':192 'schema':175 'servic':44 'simpli':117 'spars':148 'spec':172 'specif':187 'suggest':190 'technic':166 'transact':5,21,46,198 'transaction receipt API' 'transaction-receipt' 'unclear':209 'unit':101 'usd':93 'usdc':16,32,92 'usdc-base-network' 'use':82,206 'util':73 'valid':126 'via':10,26 'wallet':161 'web3':70 'x':121 'x-payment':120 'x402':11,27,84 'x402 payment endpoint' 'x402-payment'","prices":[{"id":"4d597c84-95f7-464b-a030-da783f60d309","listingId":"c0e5c395-1e7d-4aa1-8584-9f83287781eb","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/58/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":"2026-04-18T19:26:59.175Z"}],"sources":[{"listingId":"c0e5c395-1e7d-4aa1-8584-9f83287781eb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/58/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:59.175Z","lastSeenAt":"2026-04-24T02:02:57.872Z"}],"details":{"listingId":"c0e5c395-1e7d-4aa1-8584-9f83287781eb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/58/receipt \\\n  -H \"X-PAYMENT: <valid_x402_payment_proof>\" \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/58/receipt"},{"claim":"Platform pricing is $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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/58/receipt"}],"useCases":["Retrieving a transaction receipt for transaction #58 via programmatic payment","Demonstrating x402 protocol integration for pay-per-call APIs","Agent-driven access to premium data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing keyless, pay-per-call API access","Use cases requiring no subscription or rate-limit constraints"],"notFor":["Production workloads requiring documented request/response schemas","Users who need bulk or batch transaction receipt retrieval","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.379Z"},"updatedAt":"2026-04-24T02:02:57.872Z"}}