{"id":"c641bd0e-be60-4dac-b2e4-bbe2ec03cf52","shortId":"3r7mAc","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 at `/api/v1/transactions/11/receipt`. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint probed returns a 402 challenge requesting payment in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The `maxAmountRequired` is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a timeout of 300 seconds. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises a uniform $0.02/request pricing model across all its endpoints, with no API keys, no rate limits, and no minimum commitments. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the \"transaction receipt\" resource actually contains or what input parameters it expects. The endpoint path suggests it retrieves a receipt for transaction ID 11, but the semantics are unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and API pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific resource '/api/v1/transactions/11/receipt' has unclear semantics — it is unknown what data it returns","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/11/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/11/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 402 challenge with clear pricing. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the transaction receipt resource contains or what inputs it expects. The docs/pricing/API pages are all blank beyond a wallet connect 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'/request':139 '0.02':106,138 '000':96 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':89 '11':216 '20':95 '300':123 '402':82 '6':101 'Base network API' 'USDC micropayment API' 'accept':127 'across':142 'actual':197 'address':117 'advertis':135 'ai/ml':58 'analyt':57 'api':54,148,164 'application/json':132 'base':5,18,74,91,97 'base-network' 'broader':43 'call':9,22 'challeng':83 'commit':156 'connect':173 'contain':198 'content':179 'contract':88 'data':56,61 'decim':102 'descript':190 'doc':163 'document':158 'endpoint':3,16,28,78,126,145,206 'equal':105 'exact':114 'exampl':187 'expect':204 'extrem':160 'finance/web3':60 'gate':66 'howev':157 'id':215 'infer':59 'infrastructur':63 'input':201 'json-response' 'key':149 'limit':152 'lowpaymentfee' 'lowpaymentfee.com':30 'made':111 'maxamountrequir':93 'minimum':155 'model':141 'network':75 'offer':46 'openapi':183 'page':168 'paid':6,19 'paramet':202 'part':40 'path':207 'pay':51 'pay-per-call API' 'pay-per-request':50 'payment':70,85,109 'per':8,21,52,107 'per-cal':7,20 'per-request-pricing' 'platform':44,134 'post':128 'price':140,165 'probe':79 'prompt':175 'protocol':71 'provid':31 'rate':151 'readm':167 'receipt':2,15,34,195,212 'render':170 'request':53,84,108,129 'request/response':186 'resourc':35,196 'retriev':210 'return':80,131 'schema':184 'scheme':115 'second':124 'semant':219 'span':55 'spars':161 'specif':77 'substant':178 'suggest':208 'timeout':121 'transact':1,14,33,194,214 'transaction receipt API' 'transaction-receipt' 'unclear':221 'uniform':137 'unit':98 'usdc':13,26,87,104 'usdc-settlement' 'util':64 'varieti':48 'via':10,23,67,112 'wallet':174 'x402':11,24,69 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"8b00a6cd-a0c6-4abb-9427-0c76ee482363","listingId":"c641bd0e-be60-4dac-b2e4-bbe2ec03cf52","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/11/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":"2026-04-18T18:58:12.511Z"}],"sources":[{"listingId":"c641bd0e-be60-4dac-b2e4-bbe2ec03cf52","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/11/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:12.511Z","lastSeenAt":"2026-04-25T03:03:29.888Z"}],"details":{"listingId":"c641bd0e-be60-4dac-b2e4-bbe2ec03cf52","quickStartSnippet":"# The endpoint requires an x402 USDC payment on Base.\n# 1. POST to the endpoint, receive a 402 challenge.\n# 2. Construct and sign a USDC payment of $0.02 (20000 base units).\n# 3. Resubmit with X-PAYMENT header.\n\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/11/receipt\n# Returns 402 with x402 challenge; pay and retry with payment header.","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","source_url":"https://lowpaymentfee.com/api/v1/transactions/11/receipt"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/11/receipt"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt via a paid API call on Base","Demonstrating x402 payment protocol integration for per-request billing","Accessing pay-per-use infrastructure without API key management"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base for per-call access","Projects needing keyless, pay-as-you-go API access"],"notFor":["Production use cases requiring documented request/response schemas","Users who need free or subscription-based API access","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.724Z"},"updatedAt":"2026-04-25T03:03:29.888Z"}}