{"id":"18e95967-a2bf-440e-9f4a-b7bbbd2b8ce7","shortId":"ZTen59","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 174) 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 (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.\n\nThe specific endpoint probed (`/api/v1/transactions/174/receipt`) returns a valid x402 challenge (HTTP 402) requesting up to 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 via the x402 \"exact\" scheme, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely thin — 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 usage examples available. The platform's actual API functionality behind the paywall cannot be verified from the crawl alone.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific resource '/api/v1/transactions/174/receipt' is a single hardcoded transaction ID; unclear if this generalizes","Platform advertises many endpoints but none have documented schemas or verifiable functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/174/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/174/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 request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of 'transaction 174 receipt' is opaque. The listing is essentially a stub with confirmed 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'/api/v1/transactions/174/receipt':116 '/docs':180 '/pricing':182 '/readme':184 '0.02':91,145 '000':128 '0x8335':133 '174':41 '20':127 '2913':134 '300':164 '402':123 '6':140 'Base network API' 'USDC micropayment API' 'accept':169 'access':34 'actual':214 'advertis':50,153 'ai/ml':62 'alon':226 'analysi':65 'analyt':61 'api':58,103,215 'application/json':174 'avail':210 'base':8,22,99,129,136 'base-network' 'behind':42,217 'broader':47 'call':12,26,147 'cannot':220 'challeng':121 'classif':67 'commit':111 'connect':190 'consist':148 'content':196 'convers':84 'crawl':225 'data':60 'decim':141 'document':175,205 'embed':68 'endpoint':6,20,30,87,114,168 'estim':78 'exact':160 'exampl':209 'exchang':73 'extrem':177 'feed':72 'financ':69 'function':216 '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 'minimum':110 'network':100 'openapi':200 'page':185 'paid':9,23 'pay':55 'pay-per-request':54 'pay-per-request API' 'payment':155 'paywal':45,219 'per':11,25,56,92,146 'per-cal':10,24 'per-call-pricing' 'platform':49,212 'post':170 'post-method' 'price':71,89,154 'probe':115 'prompt':192 'provid':33 'quot':76 'rate':74,106 'receipt':5,19,38 'render':187 'request':57,93,124,171 'request/response':203 'resourc':39 'return':117,173 'schema':204 'scheme':161 'second':165 'sentiment':64 'settl':94 'sinc':137 'site':151 'span':59 'spec':201 'specif':113 'suit':52 'summar':66 'thin':178 'timeout':166 'token':75 'transact':4,18,37 'transaction receipt API' 'transaction-receipt' 'translat':143 'unit':130 'usag':208 'usdc':14,28,96,132,138 'usdc-settlement' 'use':139 'util':81 'valid':83,119 'verifi':222 'via':157 'wallet':191 'web3':70 'x402':2,16,44,120,159 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"db83d060-4f41-4d61-9d0f-1bad281983ef","listingId":"18e95967-a2bf-440e-9f4a-b7bbbd2b8ce7","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/174/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":"2026-04-18T18:58:52.770Z"}],"sources":[{"listingId":"18e95967-a2bf-440e-9f4a-b7bbbd2b8ce7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/174/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:52.770Z","lastSeenAt":"2026-04-24T21:04:00.334Z"}],"details":{"listingId":"18e95967-a2bf-440e-9f4a-b7bbbd2b8ce7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/174/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment proof 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":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/174/receipt"},{"claim":"Platform offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipts via micropayment-gated API calls","Programmatic access to paid data endpoints without API key management","Agent-driven workflows that need on-demand paid API access on Base"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Use cases requiring low-friction micropayment-gated endpoints"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","High-volume batch processing where per-call pricing may add up","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.852Z"},"updatedAt":"2026-04-24T21:04:00.334Z"}}