{"id":"a56a6f2a-349a-48b0-9fb9-b87cd72f73b8","shortId":"9AtYs4","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 362) 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, with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint probed (/api/v1/transactions/362/receipt) returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The response MIME type is application/json.\n\nDocumentation is extremely sparse — 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 examples of what the receipt payload actually contains. The endpoint is live and the x402 challenge is well-formed, but without documentation it is difficult to know what data is returned or what input parameters (if any) the POST body accepts.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","transaction-receipt","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["transaction receipt API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema documentation available — request body and response structure are unknown.","This endpoint targets a specific transaction ID (362); it is unclear whether it generalizes to other transaction IDs.","The platform advertises many API categories (AI, analytics, finance, utilities) but no evidence of documentation or working examples for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/362/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/362/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 well-formed x402 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples of the actual receipt payload. The endpoint path suggests a single fixed resource (transaction 362) rather than a general-purpose API, which limits 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'/api/v1/transactions/362/receipt':118 '/docs':186 '/pricing':188 '/readme':190 '0.02':93,149 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '0x8335':137 '20':131 '2913':138 '300':172 '362':42 '402':125 '6':144 'Base network API' 'USDC micropayment API' 'accept':255 'access':34 'actual':220 'advertis':51,157 'ai/ml':63 'analysi':66 'analyt':62 'api':59,105 'application/json':180 'base':8,22,101,133,140 'behind':43 'bodi':254 'broader':48 'call':12,26,151 'challeng':123,229 'classif':68 'commit':113 'connect':196 'consist':152 'contain':221 'content':202 'convers':86 'data':61,72,243 'decim':145 'difficult':239 'document':181,211,236 'embed':69 'endpoint':6,20,30,89,116,223 'estim':80 'exact':165 'exampl':214 'exchang':75 'extrem':183 'feed':74 'financ':70 'form':233 'gas':79 'gate':3,17 'generat':87 'geocod':84 'http':124 'id':41 'infer':64 'infrastructur':82 'input':248 'json-response' 'key':106 'know':241 'limit':109 'live':225 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':161 'mime':177 'minimum':112 'network':102 'no-api-key' 'openapi':206 'page':191 'paid':9,23 'paramet':249 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':219 'payment':127,159 'paywal':46 'per':11,25,57,94,150 'per-cal':10,24 'per-request-pricing' 'platform':50 'post':253 'price':73,91,158 'probe':117 'prompt':198 'provid':33 'quot':78 'rate':76,108 'receipt':5,19,39,218 'render':193 'request':58,95,126 'request/response':209 'respons':176 'return':119,245 'schema':210 'scheme':166 'second':173 'sentiment':65 'settl':96 'sinc':141 'site':155 'span':60 'spars':184 'spec':207 'specif':37,115 'suit':53 'summar':67 'timeout':174 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':147 'type':178 'unit':134 'usdc':14,28,98,136,142 'usdc-base' 'use':143 'util':83 'valid':85,121 'via':162 'wallet':168,197 'web3':71 'well':232 'well-form':231 'without':235 'x402':2,16,45,122,164,228 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6ff33cd8-3751-4025-824b-e2e6811bf25e","listingId":"a56a6f2a-349a-48b0-9fb9-b87cd72f73b8","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/362/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":"2026-04-18T19:26:17.427Z"}],"sources":[{"listingId":"a56a6f2a-349a-48b0-9fb9-b87cd72f73b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/362/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:17.427Z","lastSeenAt":"2026-04-24T18:33:08.596Z"}],"details":{"listingId":"a56a6f2a-349a-48b0-9fb9-b87cd72f73b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/362/receipt\n# Returns HTTP 402 with x402 challenge.\n# Include X-PAYMENT header with signed USDC payment to complete the request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/362/receipt"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/362/receipt"},{"claim":"All endpoints 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":"Platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 362 via micropayment","Agent-driven pay-per-call data access without API key management","Programmatic access to receipts settled on Base L2 in USDC"],"bestFor":["Agents that need keyless, pay-per-call API access","Developers experimenting with x402 payment protocol on Base","Scenarios requiring no subscription or rate-limit constraints"],"notFor":["Users needing detailed API documentation or schemas before integrating","Bulk or high-volume data retrieval where per-call pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.376Z"},"updatedAt":"2026-04-24T18:33:08.596Z"}}