{"id":"bf070e62-01b7-4cf0-a6b5-33811eaef262","shortId":"CAGzmS","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt for transaction 324. It is part of a broader platform offering a variety of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/324/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers supply an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) to the specified payTo address. No API keys, rate limits, or upfront commitments are required — access is instant once payment is verified on-chain.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more, all at the same $0.02 per-request price point. However, documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI specification or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content","The endpoint path references a specific transaction ID (324); it is unclear whether this is a generic pattern or a fixed resource","No examples of request body or response body are available from any source","The broader platform claims many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/324/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/324/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The specific purpose of this particular receipt endpoint is unclear beyond its generic 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'/api/v1/transactions/324/receipt':93 '/docs':198 '/pricing':199 '/readme':202 '0.02':14,30,79,126,182 '000':123 '20':122 '324':48 '6':130 'Base network API' 'USDC micropayment API' 'accept':94 'access':44,147 'addit':160 'address':136 'advertis':159 'ai':68 'analysi':164 'analyt':67 'api':43,64,138 'avail':228 'base':9,25,88,124 'base-network' 'beyond':190 'broader':54 'call':4,20 'caller':107 'chain':156 'classif':167 'commit':144 'connect':208 'contain':114 'content':214 'convers':175 'crawl':231 'data':66 'decim':131 'document':189,223 'embed':168 'enabl':36 'endpoint':7,23,37,92,161 'exampl':227 'exchang':171 'extrem':195 'feed':170 'financ':71 'geocod':173 'handl':102 'header':113 'howev':188 'infrastructur':74 'instant':149 'json':99 'json-response' 'key':139 'land':192 'learn':70 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'network':89 'no-api-key' 'offer':56 'on-chain':154 'openapi':218 'page':193,203 'part':51 'pay':2,18,61 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':60 'payment':100,112,118,151 'payto':135 'per':3,19,62,80,184 'per-request':183 'platform':55,158 'point':187 'post':95 'premium':42 'premium API access' 'price':12,28,77,169,186 'prompt':210 'protocol':106 'provid':40 'rate':140,172 'receipt':6,22,45 'request':63,81,96,185 'request/response':221 'requir':146 'return':98,205 'schema':222 'sentiment':163 'settl':83 'sign':116 'sinc':127 'span':65 'spars':196 'spec':219 'specif':91 'specifi':134 'substant':213 'summar':166 'suppli':108 'text':165 'transact':5,21,47 'transaction receipt API' 'transaction-receipt' 'unit':125 'upfront':143 'usag':226 'usdc':16,32,85,117,128 'usdc-settlement' 'use':129 'util':75 'valid':174 'varieti':58 'verifi':153 'via':10,26,103 'wallet':209 'web3':72 'x':111 'x-payment':110 'x402':11,27,35,105 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0a70af34-9c15-4496-9000-50951ffdf57a","listingId":"bf070e62-01b7-4cf0-a6b5-33811eaef262","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/324/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":"2026-04-18T19:26:10.730Z"}],"sources":[{"listingId":"bf070e62-01b7-4cf0-a6b5-33811eaef262","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/324/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:10.730Z","lastSeenAt":"2026-04-24T09:04:27.432Z"}],"details":{"listingId":"bf070e62-01b7-4cf0-a6b5-33811eaef262","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/324/receipt \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/324/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/324/receipt"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints for analytics, AI, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 324 via a single paid API call","Demonstrating x402 pay-per-request patterns for agent-to-agent commerce","Accessing premium data endpoints without API key registration"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need keyless, pay-per-call API access on Base","Projects requiring on-chain micropayment-gated endpoints"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-request fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.68Z"},"updatedAt":"2026-04-24T09:04:27.432Z"}}