{"id":"2c15a160-27fa-48b7-a8ff-c8d151d98bca","shortId":"YcGPyU","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 transaction receipt (resource ID 161) 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 commitments required.\n\nThe specific endpoint probed (/api/v1/transactions/161/receipt) returns a valid x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) via the \"exact\" payment scheme on Base. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 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 examples of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 marketplace rather than a mature production API.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","transaction-receipt","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint path (/api/v1/transactions/161/receipt) appears to reference a single hardcoded transaction ID; unclear if this is parameterized","No examples of actual response payloads; unknown what data the receipt contains","Platform may be a demo or early-stage project given the lack of documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/161/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/161/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, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples of what the receipt payload contains. The endpoint path suggests a single static resource (transaction 161) rather than a general-purpose API. The broader platform lists many endpoints but none are documented beyond a name and 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'/api/v1/transactions/161/receipt':116 '/docs':172 '/pricing':173 '/readme':176 '0.02':91,133 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '161':41 '20':127 '300':156 '402':123 '6':138 'Base network API' 'USDC micropayment API' 'accept':161 'access':34 'actual':206 'address':152 'advertis':50 'ai/ml':62 'analysi':65 'analyt':61 'api':58,103,226 'appear':210 'application/json':166 'base':8,22,99,129,146 'base-network' 'behind':42 'broader':47 'call':12,26 'challeng':121 'classif':67 'commit':110 'connect':182 'contain':207 'content':188 'convers':84 'data':60,70 'decim':139 'demonstr':214 'direct':150 'document':167,197 'earli':217 'early-stag':216 'embed':68 'endpoint':6,20,30,87,114,160 'estim':78 'exact':142 'exampl':200 'exchang':73 'extrem':169 'feed':72 'finance/web3':69 'gas':77 'gate':3,17 'generat':85 'geocod':82 'http':122 'id':40 'infer':63 'infrastructur':80 'json-response' 'key':104 'limit':107 'lowpaymentfee' 'lowpaymentfee.com':32,48 'marketplac':220 'matur':224 'network':100 'openapi':192 'page':177 'paid':9,23 'pay':55 'pay-per-call API' 'pay-per-request':54 'payload':205 'payment':143,148 'paywal':45 'per':11,25,56,92 'per-cal':10,24 'per-request-pricing' 'platform':49,209 'post':162 'post-method' 'price':71,89 'probe':115 'product':225 'prompt':184 'provid':33 'quot':76 'rate':74,106 'rather':221 'receipt':5,19,38,204 'render':179 'request':57,93,124,163 'request/response':195 'requir':111 'resourc':39 'return':117,165 'schema':196 'scheme':144 'second':157 'sentiment':64 'settl':94 'sinc':135 'span':59 'spars':170 'spec':193 'specif':113 'stage':218 'suit':52 'summar':66 'timeout':158 'token':75 'transact':4,18,37 'transaction receipt API' 'transaction-receipt' 'unit':130 'usd':134 'usdc':14,28,96,132,136 'usdc-settlement' 'use':137 'util':81 'valid':83,119 'via':140 'wallet':183 'x402':2,16,44,120,219 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7f6cb3ab-7aae-4efe-a242-d9f7f9a59ed7","listingId":"2c15a160-27fa-48b7-a8ff-c8d151d98bca","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/161/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":"2026-04-18T18:58:47.322Z"}],"sources":[{"listingId":"2c15a160-27fa-48b7-a8ff-c8d151d98bca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/161/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:47.322Z","lastSeenAt":"2026-04-24T21:32:28.638Z"}],"details":{"listingId":"2c15a160-27fa-48b7-a8ff-c8d151d98bca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/161/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, 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 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/161/receipt"},{"claim":"Payment directed to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/161/receipt"}],"useCases":["Retrieving a transaction receipt for a specific transaction ID via micropayment","Demonstrating x402 protocol payment flows on Base","Agent-driven pay-per-use API consumption without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Testing USDC micropayment integrations"],"notFor":["Production workloads requiring documented request/response schemas","Bulk data retrieval where per-request fees add up quickly","Users who need traditional API key authentication and rate limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.059Z"},"updatedAt":"2026-04-24T21:32:28.638Z"}}