{"id":"e66d6c12-83b8-4ee7-b436-06d7023cf9e0","shortId":"HhLt2z","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 transaction receipt retrieval service behind an x402 paywall. When called via POST, it returns a JSON receipt for transaction ID 271. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe parent site lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment is handled entirely through the x402 protocol on the Base L2 network.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 usage examples available from the crawl. The specific endpoint probed (/api/v1/transactions/271/receipt) is live and returns a valid x402 challenge, but what the receipt payload actually contains is unknown beyond the stated mimeType of application/json.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt","payment receipt","x402 API","USDC micropayment","Base network API","pay-per-request","lowpaymentfee"],"warnings":["No API documentation available; /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or output schema provided — response format is unknown beyond application/json","The endpoint is hardcoded to transaction ID 271; it is unclear whether other transaction IDs are supported or what the receipt contains","The broader site advertises many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/271/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/271/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, confirming it is operational. 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 (transaction 271) is unclear. The listing is effectively a 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'/api/v1/transactions/271/receipt':204 '/docs':165 '/pricing':167 '/readme':169 '/request':17,34 '0.02':16,33,85,133 '000':80 '0x8335':72 '20':79 '271':61 '2913':73 '6':90 'Base network API' 'USDC micropayment' 'actual':218 'advertis':131 'ai/ml':109 'analysi':112 'analyt':108 'api':105,138 'application/json':227 'avail':196 'base':9,26,67,81,157 'base-network' 'behind':45 'beyond':222 'broader':98 'call':4,21,50,104 'challeng':212 'classif':114 'commit':146 'connect':175 'contain':219 'contract':71 'convers':126 'cost':77 'crawl':199 'crypto':118 'data':107,120 'decim':91 'detail':182 'document':160,191 'embed':115 'endpoint':7,24,36,129,202 'entir':150 'equal':84 'exampl':195 'extrem':162 'financ':116 'generat':127 'geocod':124 'handl':149 'host':96 'id':60 'infer':110 'infrastructur':122 'json':56 'key':139 'l2':158 'limit':142 'live':206 'lowpaymentfee' 'lowpaymentfee.com':38,95 'market':119 'maximum':76 'mimetyp':225 'minimum':145 'network':68,159 'no-api-key' 'openapi':186 'page':170 'parent':93 'pay':2,19,102 'pay-per-cal':1,18,101 'pay-per-call' 'pay-per-request' 'payload':217 'payment':62,147 'payment receipt' 'paywal':48 'per':3,20,86,103,134 'post':52 'probe':203 'prompt':177 'protocol':154 'provid':39 'rate':141 'receipt':6,23,42,57,216 'render':172 'request':87,135 'request/response':189 'retriev':43 'return':54,208 'schema':190 'sentiment':111 'servic':44 'settl':12,29,64 'site':94 'span':106 'spars':163 'spec':187 'specif':201 'state':224 'suit':99 'summar':113 'technic':181 'transact':5,22,41,59 'transaction receipt' 'transaction-receipt' 'unit':82 'unknown':221 'usag':194 'usdc':14,31,70,88 'usdc-settlement' 'use':69,89 'util':123 'valid':125,210 'via':10,27,51 'wallet':176 'x402':11,28,47,153,211 'x402 API' 'x402-payment'","prices":[{"id":"57ae127b-a394-48a2-b0b9-eb32f99b1832","listingId":"e66d6c12-83b8-4ee7-b436-06d7023cf9e0","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/271/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":"2026-04-18T18:59:40.899Z"}],"sources":[{"listingId":"e66d6c12-83b8-4ee7-b436-06d7023cf9e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/271/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:40.899Z","lastSeenAt":"2026-04-24T15:03:06.672Z"}],"details":{"listingId":"e66d6c12-83b8-4ee7-b436-06d7023cf9e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/271/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/271/receipt"},{"claim":"All endpoints are priced 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 site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/271/receipt"}],"useCases":["Retrieving a JSON receipt for a specific transaction via a single paid API call","Demonstrating x402 protocol integration for pay-per-call services on Base","Programmatic receipt fetching without API key registration"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand transaction receipts without subscription overhead","Projects that want keyless, pay-as-you-go API access on Base"],"notFor":["Bulk receipt retrieval at scale (no documented batch endpoint)","Users who need detailed API documentation or response schema guarantees","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.52Z"},"updatedAt":"2026-04-24T15:03:06.672Z"}}