{"id":"c07d20c8-18c3-4d0f-9429-a1b7b24103de","shortId":"ZFaFYA","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 235) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (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 required.\n\nThe specific endpoint probed (/api/v1/transactions/235/receipt) returned a valid x402 challenge with a maxAmountRequired of 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. The endpoint accepts POST requests and returns 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 platform appears to be a demonstration or early-stage deployment of x402-based micropayment APIs rather than a mature, fully documented service.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","transaction-receipt","json-response","no-api-key","micropayment"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint references a specific transaction ID (235); unclear if this is a demo or a real resource","Platform appears to be early-stage or a demonstration; reliability and longevity are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/235/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/235/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 valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response schema, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The specific resource (transaction 235 receipt) is opaque with no explanation of what it 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'/api/v1/transactions/235/receipt':119 '/docs':183 '/pricing':185 '/readme':187 '0.02':93,147 '000':130 '0x8335':135 '20':129 '235':42 '2913':136 '402 payment required' '6':142 'Base network API' 'USDC pay-per-call' 'accept':172 'access':34 'actual':217 'address':169 'advertis':51,155 'ai':63 'analysi':67 'analyt':62 'api':59,105,236 'appear':221 'application/json':177 'base':8,22,101,131,138,234 'behind':43 'broader':48 'call':12,26,149 'challeng':124 'classif':69 'commit':113 'connect':193 'consist':150 'contain':218 'content':199 'convers':86 'crypto payment API' 'data':61 'decim':143 'demonstr':225 'deploy':230 'document':178,208,242 'earli':228 'early-stag':227 'embed':70 'endpoint':6,20,30,89,117,171 'estim':80 'exact':163 'exampl':211 'exchang':75 'extrem':180 'feed':74 'financ':71 'fulli':241 'gas':79 'gate':3,17 'generat':87 'geocod':84 'id':41 'infrastructur':82 'json-response' 'key':106 'learn':65 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'made':159 'matur':240 'maxamountrequir':127 'micropay':235 'micropayment' 'minimum':112 'network':102 'no-api-key' 'openapi':203 'page':188 'paid':9,23 'pay':56 'pay-per-request':55 'payload':216 'payment':157 'payto':168 'paywal':46 'per':11,25,57,94,148 'per-cal':10,24 'per-request-pricing' 'platform':50,220 'post':173 'price':73,91,156 'probe':118 'prompt':195 'provid':33 'quot':78 'rate':76,108 'rather':237 'receipt':5,19,39,215 'render':190 'request':58,95,174 'request/response':206 'requir':114 'return':120,176 'schema':207 'scheme':164 'sentiment':66 'servic':243 'settl':96 'sinc':139 'site':153 'span':60 'spars':181 'spec':204 'specif':37,116 'specifi':167 'stage':229 'suit':53 'summar':68 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':145 'unit':132 'usdc':14,28,98,134,140 'usdc-base' 'use':141 'util':83 'valid':85,122 'via':160 'wallet':194 'web3':72 'x402':2,16,45,123,162,233 'x402 micropayment' 'x402-based':232 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d6a49dfb-d867-4880-9d0d-20c3a4975fa6","listingId":"c07d20c8-18c3-4d0f-9429-a1b7b24103de","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/235/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":"2026-04-18T18:59:27.665Z"}],"sources":[{"listingId":"c07d20c8-18c3-4d0f-9429-a1b7b24103de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/235/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:27.665Z","lastSeenAt":"2026-04-24T16:03:18.253Z"}],"details":{"listingId":"c07d20c8-18c3-4d0f-9429-a1b7b24103de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/235/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access the receipt.","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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/235/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 235 via micropayment","Demonstrating x402 protocol-based API access on Base","Agent-driven pay-per-call data retrieval without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Exploring micropayment-gated API patterns"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume data retrieval where per-call pricing is inefficient","Users who need traditional API key authentication and rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.155Z"},"updatedAt":"2026-04-24T16:03:18.253Z"}}