{"id":"b2b3efda-dc79-4599-9c66-7e06cae8deb0","shortId":"EBZ2kK","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 (transaction ID 330) 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 priced at $0.02 per request with no API keys, no rate limits, and settlement on the Base network using USDC.\n\nThe specific probed endpoint (`/api/v1/transactions/330/receipt`) returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base. Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. 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 x402 API marketplace. Agents should be aware that the actual response schema for this receipt endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","per-call-pricing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment gateway"],"warnings":["No OpenAPI or schema documentation available — response format is entirely unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint path contains a hardcoded transaction ID (330); unclear if other IDs are supported","Platform appears to be early-stage or a demonstration; reliability and longevity are uncertain","No information on what fields the receipt response actually contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/330/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/330/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 endpoint appears to serve a single hardcoded transaction receipt with unknown payload 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'/api/v1/transactions/330/receipt':105 '/docs':165 '/pricing':167 '/readme':169 '0.02':83,131 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':120 '20':114 '300':149 '330':39 '6':126 'Base network API' 'USDC micropayment API' 'accept':154 'access':32 'actual':199,221 'address':145 'advertis':48,139 'agent':215 'ai/ml':56 'analysi':59 'analyt':55 'api':52,88,213 'appear':203 'application/json':159 'awar':218 'base':5,18,97,116,122 'base-network' 'behind':40 'broader':45 'call':9,22,133 'challeng':110 'classif':61 'connect':175 'consist':134 'contain':200 'content':181 'convers':78 'crypto payment gateway' 'data':54 'decim':127 'demonstr':207 'document':160,190 'earli':210 'early-stag':209 'embed':62 'endpoint':3,16,28,104,153,227 'estim':72 'exampl':193 'exchang':67 'extrem':162 'feed':66 'financ':63 'gas':71 'generat':79 'geocod':76 'id':38 'infer':57 'infrastructur':74 'json-response' 'key':89 'limit':92 'lowpaymentfee' 'lowpaymentfee.com':30,46 'marketplac':214 'network':98 'no-api-key' 'openapi':185 'page':170 'paid':6,19 'pay-per-call API' 'payload':198 'payment':141 'paywal':43 'per':8,21,84,132 'per-cal':7,20 'per-call-pricing' 'platform':47,202 'post':155 'price':65,81,140 'probe':103 'prompt':177 'provid':31 'quot':70 'rate':68,91 'receipt':2,15,36,197,226 'render':172 'request':85,111,156 'request/response':188 'respons':222 'return':106,158 'schema':189,223 'second':150 'sent':143 'sentiment':58 'settlement':94 'sinc':123 'site':137 'span':53 'spars':163 'spec':186 'specif':102 'stage':211 'suit':50 'summar':60 'timeout':151 'token':69 'transact':1,14,35,37 'transaction receipt API' 'transaction-receipt' 'translat':129 'unit':117 'unknown':229 'usdc':13,26,100,119,124 'usdc-settlement' 'use':99,125 'util':75 'valid':77,108 'via':10,23 'wallet':176 'web3':64 'x402':11,24,42,109,212 'x402 payment endpoint' 'x402-payment'","prices":[{"id":"415509fc-b51e-446a-994d-0063f70d357f","listingId":"b2b3efda-dc79-4599-9c66-7e06cae8deb0","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/330/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":"2026-04-18T19:26:10.127Z"}],"sources":[{"listingId":"b2b3efda-dc79-4599-9c66-7e06cae8deb0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/330/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:10.127Z","lastSeenAt":"2026-04-24T09:04:27.466Z"}],"details":{"listingId":"b2b3efda-dc79-4599-9c66-7e06cae8deb0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/330/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 site advertises all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/330/receipt"},{"claim":"The platform lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 330 via a single paid API call","Demonstrating x402 protocol payment flows on Base with USDC","Integrating pay-per-use API access without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents needing keyless, pay-per-call API access on Base","Testing USDC micropayment flows for API monetization"],"notFor":["Production workloads requiring documented request/response schemas","Bulk transaction receipt retrieval (single transaction ID hardcoded in path)","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.67Z"},"updatedAt":"2026-04-24T09:04:27.466Z"}}