{"id":"f1f78b17-8b79-462d-8256-19d8a01f8416","shortId":"FjcSac","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt resource for transaction 303. It is part of a broader platform offering multiple pay-per-call API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/transactions/303/receipt` accepts POST requests and settles payments on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02. Payment is made via the x402 \"exact\" scheme with a 300-second timeout. The endpoint returns application/json responses.\n\nDocumentation on the site 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 platform lists many other endpoints across analytics, AI, finance, and utility categories, but details about any of them are unavailable beyond their names and uniform $0.02 pricing.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific meaning of 'transaction 303 receipt' is unclear — it may be a demo or placeholder endpoint","No information on what data the receipt contains or what inputs are expected in the POST body"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/303/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/303/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond endpoint names, no request/response examples, and the specific purpose of this 'transaction 303 receipt' endpoint is unexplained. The docs/pricing/API pages are all blank beyond a wallet connect 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'/request':17,34 '0.02':16,33,81,131,220 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':120 '300':142 '303':51 '6':126 'Base network API' 'USDC micropayment API' 'accept':99 'access':46 'across':200 'actual':192 'advertis':116 'ai':70,202 'analyt':69,201 'api':45,65,86,159 'application/json':148 'base':9,26,107,122 'base-network' 'beyond':215 'broader':57 'call':4,21,64 'categori':66,206 'challeng':115 'commit':93 'connect':168 'contain':193 'content':174 'contract':111 'crypto payment API' 'data':68 'decim':127 'detail':208 'doc':158 'document':150,183 'enabl':38 'endpoint':7,24,39,97,146,199 'equal':130 'exact':138 'exampl':186 'extrem':155 'financ':73,203 'includ':67 'infrastructur':76 'json-response' 'key':87 'learn':72 'limit':90 'list':196 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':71 'made':134 'mani':197 'maxamountrequir':118 'multipl':60 'name':217 'network':108 'no-api-key' 'offer':59 'openapi':178 'page':163 'part':54 'pay':2,19,62 'pay-per-cal':1,18,61 'pay-per-call' 'pay-per-request API' 'payload':191 'payment':104,132 'per':3,20,63,82 'platform':58,195 'post':100 'premium':44 'price':79,160,221 'prompt':170 'provid':42 'rate':89 'readm':162 'receipt':6,23,47,190 'render':165 'request':83,101 'request/response':181 'requir':94 'resourc':48 'respons':149 'return':147 'schema':182 'scheme':139 'second':143 'settl':12,29,103 'site':153 'spars':156 'spec':179 'specif':96 'timeout':144 'transact':5,22,50 'transaction receipt API' 'transaction-receipt' 'unavail':214 'uniform':219 'unit':123 'usdc':14,31,110,129 'usdc-settlement' 'use':109 'util':77,205 'via':10,27,135 'wallet':169 'web3':74 'x402':11,28,37,114,137 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"e29b1ba6-c9cf-463e-be13-e78e1b836f36","listingId":"f1f78b17-8b79-462d-8256-19d8a01f8416","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/303/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":"2026-04-18T19:25:55.562Z"}],"sources":[{"listingId":"f1f78b17-8b79-462d-8256-19d8a01f8416","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/303/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:55.562Z","lastSeenAt":"2026-04-24T10:33:27.763Z"}],"details":{"listingId":"f1f78b17-8b79-462d-8256-19d8a01f8416","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/303/receipt \\\n  -H \"X-PAYMENT: <x402-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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/303/receipt"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/303/receipt"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 303 via a single paid API call","Demonstrating x402 pay-per-call integration on the Base network","Agent-driven programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing keyless, pay-per-call API access","Low-friction micropayment API consumption at $0.02/request"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume batch processing where per-call pricing may add up","Anyone requiring non-USDC or non-Base-network settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.378Z"},"updatedAt":"2026-04-24T10:33:27.763Z"}}