{"id":"222f72ea-0034-493e-98c6-58ffb8ac693b","shortId":"r7hJKM","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 285) 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 no commitments.\n\nThe specific probed endpoint (`/api/v1/transactions/285/receipt`) is live and returns a standard x402 challenge on Base network. It accepts payment in USDC (contract 0x8335…2913) with a maxAmountRequired of 20000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is settled on-chain via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The endpoint expects HTTP POST and returns application/json.\n\nDocumentation beyond the landing page 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 examples of what the receipt payload actually contains. The platform's claim of 16+ API endpoints at uniform $0.02 pricing is visible on the homepage but none of the individual endpoints are documented in detail.","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 paid endpoint","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call API","crypto payment gateway"],"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 specific endpoint path (/api/v1/transactions/285/receipt) is not listed among the homepage's advertised APIs — its purpose and output are unclear","No examples of successful responses exist in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/285/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/285/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 there is zero documentation on what the receipt payload contains, no OpenAPI spec, no request/response examples, and all doc pages render only 'Connect wallet'. The listing is effectively a stub with only the payment challenge and homepage description to work 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'/api/v1/transactions/285/receipt':100 '/docs':170 '/pricing':172 '/readme':174 '0.02':83,129,216 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':118 '16':211 '20000':124 '285':39 '2913':119 '300':150 '6':132 'Base network API' 'USDC micropayment API' 'accept':113 'access':32 'actual':204 'address':146 'advertis':48 'ai/ml':56 'analysi':59 'analyt':55 'api':52,88,212 'application/json':160 'base':5,18,110,125 'base-network' 'behind':40 'beyond':162 'broader':45 'call':9,22 'chain':139 'challeng':108 'claim':209 'classif':61 'commit':95 'connect':180 'contain':205 'content':186 'contract':117 'convers':78 'crypto payment gateway' 'data':54 'decim':133 'detail':232 'document':161,195,230 'embed':62 'endpoint':3,16,28,99,154,213,228 'equal':128 'estim':72 'exact':143 'exampl':198 'exchang':67 'expect':155 'extrem':167 'feed':66 'financ':63 'gas':71 'generat':79 'geocod':76 'homepag':222 'http':156 'id':38 'individu':227 'infer':57 'infrastructur':74 'json-response' 'key':89 'land':164 'limit':92 'live':102 'lowpaymentfee' 'lowpaymentfee.com':30,46 'maxamountrequir':122 'network':111 'no-api-key' 'none':224 'on-chain':137 'openapi':190 'page':165,175 'paid':6,19 'pay-per-call API' 'payload':203 'payment':114,134 'paywal':43 'per':8,21,84 'per-cal':7,20 'per-call-pricing' 'platform':47,207 'post':157 'price':65,81,217 'probe':98 'prompt':182 'provid':31 'quot':70 'rate':68,91 'receipt':2,15,36,202 'render':177 'request':85 'request/response':193 'resourc':37 'return':104,159 'schema':194 'scheme':144 'second':151 'sentiment':58 'settl':136 'span':53 'spec':191 'specif':97 'standard':106 'suit':50 'summar':60 'thin':168 'timeout':152 'token':69 'transact':1,14,35 'transaction receipt API' 'transaction-receipt' 'uniform':215 'unit':126 'usdc':13,26,116,130 'usdc-settlement' 'use':131 'util':75 'valid':77 'via':10,23,140 'visibl':219 'wallet':181 'web3':64 'x402':11,24,42,107,142 'x402 paid endpoint' 'x402-payment'","prices":[{"id":"42fe5ae0-0c36-488e-973c-3f3e763e1505","listingId":"222f72ea-0034-493e-98c6-58ffb8ac693b","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/285/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":"2026-04-18T18:59:52.235Z"}],"sources":[{"listingId":"222f72ea-0034-493e-98c6-58ffb8ac693b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/285/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:52.235Z","lastSeenAt":"2026-04-24T13:32:37.146Z"}],"details":{"listingId":"222f72ea-0034-493e-98c6-58ffb8ac693b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/285/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/285/receipt"},{"claim":"The platform advertises 16+ APIs across data, AI, finance, and infrastructure categories all at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform claims no API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt by paying $0.02 in USDC per call","Demonstrating x402 protocol payment flows on Base network","Agent-driven micropayment API consumption without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases requiring keyless, pay-per-call API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need fiat-only payment options","High-volume batch retrieval where per-call crypto settlement adds overhead"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.009Z"},"updatedAt":"2026-04-24T13:32:37.146Z"}}