{"id":"6f90552c-f152-418d-aefb-edc65ab0a244","shortId":"HHsdW2","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource ID 336) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI/ML inference (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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific probed endpoint (`/api/v1/transactions/336/receipt`) returned a live 402 challenge using the x402 \"exact\" scheme. It accepts USDC (contract 0x8335…2913) on Base, with a maxAmountRequired of 20000 base units — which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nDocumentation on the site is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact content returned by the receipt endpoint after payment is unknown. The platform appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","transaction-receipt","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI or schema documentation available — all /docs, /api, /pricing, /README pages return only 'Connect wallet'","The exact request body format and response payload for this endpoint are unknown","The platform appears to be early-stage or a demo; no SLA or support information found","The specific meaning of 'transaction 336 receipt' is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/336/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/336/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 and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples. The specific purpose of the /transactions/336/receipt resource is unclear. Effectively a stub 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'/api/v1/transactions/336/receipt':110 '/docs':169 '/pricing':171 '/readme':173 '0.02':85,138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':125 '20000':133 '2913':126 '300':152 '336':39 '402':114 '6':142 'Base network API' 'USDC micropayment API' 'accept':122 'access':32 'address':148 'advertis':48 'ai/ml':56 'analysi':59 'analyt':55 'api':52,97,225 'appear':215 'application/json':160 'avail':200 'base':5,18,93,128,134 'behind':40 'broader':45 'call':9,22 'challeng':115 'classif':61 'commit':104 'connect':179 'content':203 'contract':124 'convers':78 'crypto payment endpoint' 'data':54 'decim':143 'demonstr':219 'detail':186 'document':161,195 'earli':222 'early-stag':221 'embed':62 'endpoint':3,16,28,81,109,208 'equal':137 'estim':72 'exact':119,202 'exampl':198 'exchang':67 'extrem':166 'feed':66 'financ':63 'gas':71 'generat':79 'geocod':76 'given':139 'id':38 'infer':57 'infrastructur':74 'json-response' 'key':98 'limit':101 'live':113 'lowpaymentfee' 'lowpaymentfee.com':30,46 'marketplac':226 'maxamountrequir':131 'mime':157 'network':94 'openapi':190 'page':174 'paid':6,19 'pay-per-call API' 'payabl':88 'payload':199 'payment':144,210 'paywal':43 'per':8,21,86 'per-cal':7,20 'per-call-pricing' 'platform':47,214 'price':65,83 'probe':108 'prompt':181 'provid':31 'quot':70 'rate':68,100 'receipt':2,15,36,207 'render':176 'request':87 'request/response':193 'requir':105 'resourc':37 'respons':156 'return':111,204 'schema':194 'scheme':120 'second':153 'sent':146 'sentiment':58 'site':164 'span':53 'spec':191 'specif':107 'stage':223 'suit':50 'summar':60 'technic':185 'thin':167 'timeout':154 'token':69 'transact':1,14,35 'transaction receipt API' 'transaction-receipt' 'type':158 'unit':135 'unknown':212 'usdc':13,26,90,123,140 'usdc-base' 'use':116 'util':75 'valid':77 'via':10,23 'wallet':180 'web3':64 'x402':11,24,42,118,224 'x402 paid API' 'x402-payment'","prices":[{"id":"6aa535ab-6e7b-4e50-87ec-d17acf4e4a92","listingId":"6f90552c-f152-418d-aefb-edc65ab0a244","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/336/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":"2026-04-18T19:26:04.132Z"}],"sources":[{"listingId":"6f90552c-f152-418d-aefb-edc65ab0a244","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/336/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:04.132Z","lastSeenAt":"2026-04-24T09:04:27.161Z"}],"details":{"listingId":"6f90552c-f152-418d-aefb-edc65ab0a244","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/336/receipt \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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 in USDC on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/336/receipt"}],"useCases":["Retrieving a transaction receipt after paying $0.02 in USDC on Base","Demonstrating x402 protocol payment flows for agent-to-agent commerce","Accessing pay-per-call APIs without API key registration"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Projects exploring micropayment-gated API patterns"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","Applications requiring high-throughput with guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.989Z"},"updatedAt":"2026-04-24T09:04:27.161Z"}}