{"id":"274bda36-f8c2-4447-86de-fa027c9c9051","shortId":"A37XsC","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 365) 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/365/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 the specified payTo address, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, 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. The nature of the \"receipt\" data returned is not documented beyond the endpoint path and MIME type.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The specific data returned by the transaction receipt endpoint is undocumented","The broader platform advertises many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/365/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/365/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, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the docs pages are empty. The purpose of the 'transaction receipt' resource is unclear, making this effectively a stub 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'/api/v1/transactions/365/receipt':115 '/docs':187 '/pricing':188 '/readme':191 '0.02':90,146 '000':129 '0x8335':134 '20':128 '2913':135 '300':171 '365':40 '402':122 '6':141 'Base network API' 'USDC micropayment API' 'accept':176 'address':168 'advertis':49,154 'ai/ml':61 'analysi':64 'analyt':60 'api':57,102 'application/json':181 'avail':217 'base':8,22,98,130,137 'base-network' 'behind':41 'beyond':228 'broader':46 'call':12,26,148 'challeng':120 'classif':66 'commit':110 'connect':197 'consist':149 'content':203 'convers':83 'data':59,69,223 'decim':142 'document':182,212,227 'embed':67 'endpoint':6,20,30,86,113,175,230 'estim':77 'exact':162 'exampl':216 'exchang':72 'extrem':184 'feed':71 'finance/web3':68 'gas':76 'gate':3,17 'generat':84 'geocod':81 'http':121 'id':39 'infer':62 'infrastructur':79 'json-response' 'key':103 'limit':106 'lowpaymentfee' 'lowpaymentfee.com':32,47 'made':158 'mime':233 'minimum':109 'natur':219 'network':99 'no-api-key' 'openapi':207 'page':192 'paid':9,23 'path':231 'pay':54 'pay-per-request':53 'pay-per-request API' 'payment':124,156 'payto':167 'paywal':44 'per':11,25,55,91,147 'per-cal':10,24 'per-call-pricing' 'platform':48 'post':177 'price':70,88,155 'probe':114 'prompt':199 'provid':33 'quot':75 'rate':73,105 'receipt':5,19,36,222 'render':194 'request':56,92,123,178 'request/response':210 'resourc':37 'return':116,180,224 'schema':211 'scheme':163 'second':172 'sentiment':63 'settl':93 'sinc':138 'site':152 'span':58 'spars':185 'spec':208 'specif':112 'specifi':166 'suit':51 'summar':65 'timeout':173 'token':74 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'translat':144 'type':234 'unit':131 'usag':215 'usdc':14,28,95,133,139 'usdc-settlement' 'use':140 'util':80 'valid':82,118 'via':159 'wallet':198 'x402':2,16,43,119,161 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0e25b2d3-e76d-4dfd-a689-b2ecef722f7d","listingId":"274bda36-f8c2-4447-86de-fa027c9c9051","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/365/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":"2026-04-18T19:26:29.461Z"}],"sources":[{"listingId":"274bda36-f8c2-4447-86de-fa027c9c9051","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/365/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:29.461Z","lastSeenAt":"2026-04-24T06:32:42.962Z"}],"details":{"listingId":"274bda36-f8c2-4447-86de-fa027c9c9051","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/365/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to receive the receipt.","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/365/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 USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/365/receipt"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 365 via a single micropayment","Programmatic access to paid API resources without API key management","Agent-driven pay-per-call data retrieval on Base L2"],"bestFor":["Agents or scripts that need one-off paid data retrieval without subscription overhead","Developers exploring x402 payment protocol integrations","Use cases where no-signup, no-API-key access is preferred"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-volume batch retrieval where per-call pricing may add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.786Z"},"updatedAt":"2026-04-24T06:32:42.962Z"}}