{"id":"f40ca264-e8cc-4869-84e5-4d2acb3b251a","shortId":"9UZk7N","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 149) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (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 — no API keys, no rate limits, no subscriptions.\n\nThe specific endpoint probed (`/api/v1/transactions/149/receipt`) returns a valid x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout. The response MIME type is `application/json`. The endpoint accepts POST requests and is marked as discoverable.\n\nDocumentation is extremely thin — the docs, API, pricing, 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 usage examples available from the crawl. The platform's actual data sources and model providers are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no useful content","The specific purpose of /api/v1/transactions/149/receipt is unclear — 'Premium API Access' is generic","No request body schema or response schema documented anywhere","Actual data sources and model providers behind the platform are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/149/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/149/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality behind 'Premium API Access' for transaction 149 is unclear. Effectively a stub 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'0.02':90,133,136 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '149':40 '20':127 '300':151 '402':123 'Base network API' 'USDC micropayment API' 'accept':162 'actual':212 'address':147 'advertis':49 'ai/ml':61 'analysi':64 'analyt':60 'api':57,105,176 'application/json':159 'avail':205 'base':8,22,98,129,138 'base-network' 'behind':41 'broader':46 'call':12,26 'challeng':121 'classif':66 'connect':185 'content':191 'convers':83 'crawl':208 'crypto payment endpoint' 'data':59,69,213 'discover':169 'doc':175 'document':170,200 'embed':67 'endpoint':6,20,30,86,114,161 'estim':77 'exact':144 'exampl':204 'exchang':72 'extrem':172 'feed':71 'finance/web3':68 'gas':76 'gate':3,17 'generat':84 'geocod':81 'http':122 'i.e':135 'id':39 'infer':62 'infrastructur':79 'json-response' 'key':106 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':32,47 'made':141 'mark':167 'mime':156 'model':216 'network':99 'no-api-key' 'openapi':195 'page':180 'paid':9,23 'pay':54 'pay-per-call API' 'pay-per-request':53 'payment':139 'paywal':44 'per':11,25,55,91 'per-cal':10,24 'platform':48,210 'post':163 'price':70,88,177 'probe':115 'prompt':187 'protocol':103 'provid':33,217 'quot':75 'rate':73,108 'readm':179 'receipt':5,19,36 'render':182 'request':56,92,124,164 'request/response':198 'resourc':37 'respons':155 'return':117 'schema':199 'scheme':145 'second':152 'sentiment':63 'settl':93 'sourc':214 'span':58 'spec':196 'specif':113 'subscript':111 'suit':51 'summar':65 'thin':173 'timeout':153 'token':74 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'type':157 'unit':130 'unknown':219 'usag':203 'usdc':14,28,95,132,134 'usdc-settlement' 'util':80 'valid':82,119 'via':100,142 'wallet':186 'x402':2,16,43,102,120 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fe23ed3d-516e-42ff-99ae-f157691e4902","listingId":"f40ca264-e8cc-4869-84e5-4d2acb3b251a","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/149/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":"2026-04-18T18:58:40.019Z"}],"sources":[{"listingId":"f40ca264-e8cc-4869-84e5-4d2acb3b251a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/149/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:40.019Z","lastSeenAt":"2026-04-24T22:32:56.277Z"}],"details":{"listingId":"f40ca264-e8cc-4869-84e5-4d2acb3b251a","quickStartSnippet":"# Send a POST with x402 payment header to retrieve the receipt\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/149/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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/149/receipt"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipts programmatically with per-call USDC payment","Integrating pay-per-request APIs into agent workflows without API key management","Accessing financial or utility data behind x402 paywalls on Base"],"bestFor":["Agents or services that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Workflows requiring no-signup, instant API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing at $0.02 may be costly","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.407Z"},"updatedAt":"2026-04-24T22:32:56.277Z"}}