{"id":"859d6aea-18b8-4762-a5e1-2b2d36df54d8","shortId":"M6afBD","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 specific transaction receipt (transaction ID 260) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (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 commitments.\n\nThe specific endpoint probed (/api/v1/transactions/260/receipt) returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme. 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 functional (root returns 200, x402 challenge is well-formed), but the lack of documentation makes it difficult to know what data is returned or what input the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","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 API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request body or response payload","Unclear what data the transaction receipt for ID 260 actually contains","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/260/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/260/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is well-formed and the endpoint is live, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples of the actual receipt payload. The docs pages are empty stubs. The specific purpose of this particular receipt endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/transactions/260/receipt':117 '/docs':167 '/pricing':169 '/readme':171 '0.02':93,138 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':133 '20':127 '200':209 '260':42 '6':142 'Base network API' 'USDC micropayment API' 'accept':156 'access':34 'actual':201 'address':148 'advertis':51 'ai':63 'analysi':67 'analyt':62 'api':59,105 'appear':205 'application/json':161 'base':8,22,101,129,135 'base-network' 'behind':43 'bodi':235 'broader':48 'call':12,26 'challeng':122,211 'classif':69 'commit':112 'connect':177 'contain':202 'content':183 'convers':86 'crypto payment gateway' 'data':61,227 'decim':143 'difficult':223 'document':162,192,220 'embed':70 'endpoint':6,20,30,89,115,155 'equal':137 'estim':80 'exact':152 'exampl':195 'exchang':75 'expect':236 'extrem':164 'feed':74 'financ':71 'form':215 'function':206 'gas':79 'gate':3,17 'generat':87 'geocod':84 'given':139 'id':41 'infrastructur':82 'input':232 'json-response' 'key':106 'know':225 'lack':218 'learn':65 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'make':221 'maxamountrequir':125 'network':102 'no-api-key' 'openapi':187 'page':172 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':200 'payment':144 'paywal':46 'per':11,25,57,94 'per-cal':10,24 'platform':50,204 'post':157,234 'price':73,91 'probe':116 'prompt':179 'provid':33 'quot':78 'rate':76,108 'receipt':5,19,39,199 'render':174 'request':58,95,158 'request/response':190 'return':118,160,208,229 'root':207 'schema':191 'scheme':153 'sent':146 'sentiment':66 'settl':96 'span':60 'spars':165 'spec':188 'specif':37,114 'suit':53 'summar':68 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unit':130 'usdc':14,28,98,132,140 'usdc-settlement' 'use':150 'util':83 'valid':85,120 'wallet':178 'web3':72 'well':214 'well-form':213 'x402':2,16,45,121,210 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ccd0cbbf-23e8-4228-bf1e-201d12a39125","listingId":"859d6aea-18b8-4762-a5e1-2b2d36df54d8","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/260/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":"2026-04-18T18:59:39.695Z"}],"sources":[{"listingId":"859d6aea-18b8-4762-a5e1-2b2d36df54d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/260/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:39.695Z","lastSeenAt":"2026-04-24T15:03:06.535Z"}],"details":{"listingId":"859d6aea-18b8-4762-a5e1-2b2d36df54d8","quickStartSnippet":"# 1. POST to the endpoint without payment to get the x402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/260/receipt\n# Returns 402 with x402 payment challenge in JSON body.\n# 2. Construct an X-PAYMENT header per x402 spec, paying 20000 base units USDC ($0.02) on Base.\n# 3. Re-send the POST with the X-PAYMENT header to receive the receipt.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/260/receipt","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/260/receipt"},{"claim":"All endpoints on the platform are 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":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipt data for transaction ID 260 via a single micropayment","Programmatic access to receipt information without API key registration","Agent-driven workflows that need to fetch financial transaction records on-demand"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Use cases requiring transaction receipt retrieval without subscription overhead"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Bulk retrieval of many transaction receipts (each call costs $0.02 individually)","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.665Z"},"updatedAt":"2026-04-24T15:03:06.535Z"}}