{"id":"d878032f-ed26-4a30-aaab-89c25dc3ee59","shortId":"KDxrqS","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 access to a specific transaction receipt (transaction ID 178) 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.\n\nThe specific endpoint probed (/api/v1/transactions/178/receipt) returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. No API keys or rate limits are required; access is granted purely through x402 payment.\n\nDocumentation 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 detailed description of what the transaction receipt contains or what input parameters are accepted. The endpoint accepts POST requests and returns application/json, but the actual payload structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a wallet connect prompt","No OpenAPI or JSON schema describing request parameters or response format","The specific endpoint is for a single transaction ID (178); unclear if this is a demo or a real resource","No information on what data the transaction receipt contains","Platform lists many API categories (AI, analytics, finance, utilities) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/178/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/178/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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of this transaction receipt endpoint is unclear. The docs pages are all empty wallet-connect 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'/api/v1/transactions/178/receipt':110 '/docs':183 '/pricing':185 '/readme':187 '0.02':92,138 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x8335':126 '178':42 '20':120 '2913':127 '300':160 '6':133 'Base network API' 'USDC micropayment API' 'accept':223,226 'access':34,171 'actual':234 'address':156 'advertis':51,146 'ai/ml':63 'analysi':66 'analyt':62 'api':59,164 'application/json':231 'base':8,22,100,122,129 'base-network' 'behind':43 'broader':48 'call':12,26,140 'challeng':115 'classif':68 'connect':193 'consist':141 'contain':217 'content':199 'convers':85 'crypto payment endpoint' 'data':61,71 'decim':134 'descript':211 'detail':210 'document':178 'embed':69 'endpoint':6,20,30,88,108,225 'equat':136 'estim':79 'exact':153 'exampl':207 'exchang':74 'extrem':180 'feed':73 'finance/web3':70 'gas':78 'gate':3,17 'generat':86 'geocod':83 'grant':173 'id':41 'infer':64 'infrastructur':81 'input':220 'json-response' 'key':165 'limit':168 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':150 'maxamountrequir':118 'network':101 'no-api-key' 'openapi':203 'page':188 'paid':9,23 'paramet':221 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':235 'payment':148,177 'paywal':46 'per':11,25,57,93,139 'per-cal':10,24 'platform':50 'post':227 'price':72,90,147 'probe':109 'prompt':195 'protocol':105 'provid':33 'pure':174 'quot':77 'rate':75,167 'receipt':5,19,39,216 'render':190 'request':58,94,228 'request/response':206 'requir':170 'return':111,230 'schema':204 'scheme':154 'second':161 'sentiment':65 'settl':95 'sinc':130 'site':144 'span':60 'spars':181 'specif':37,107 'structur':236 'substant':198 'suit':53 'summar':67 'timeout':162 'token':76 'transact':4,18,38,40,215 'transaction receipt API' 'transaction-receipt' 'unit':123 'unknown':238 'usdc':14,28,97,125,131 'usdc-settlement' 'use':132 'util':82 'valid':84,113 'via':102,151 'wallet':194 'x402':2,16,45,104,114,176 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"560ff794-a655-4be7-b423-c6c0f6454ed4","listingId":"d878032f-ed26-4a30-aaab-89c25dc3ee59","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/178/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":"2026-04-18T18:58:55.194Z"}],"sources":[{"listingId":"d878032f-ed26-4a30-aaab-89c25dc3ee59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/178/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:55.194Z","lastSeenAt":"2026-04-25T16:03:55.296Z"}],"details":{"listingId":"d878032f-ed26-4a30-aaab-89c25dc3ee59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/178/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to proceed.","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, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/178/receipt"},{"claim":"Platform advertises APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipt data for transaction 178 via a single micropayment","Programmatic access to paid API endpoints without API key management","Agent-driven data retrieval with on-chain USDC settlement on Base"],"bestFor":["Developers or agents needing keyless, pay-per-use API access on Base","Workflows requiring on-chain payment settlement for API calls","Quick one-off data retrieval without subscription commitments"],"notFor":["Users needing detailed API documentation or schema definitions before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.639Z"},"updatedAt":"2026-04-25T16:03:55.296Z"}}