{"id":"72ae0be1-cdd1-4648-8fb9-d522332877d0","shortId":"FACYv8","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 281) 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 via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/transactions/281/receipt) returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by micropayment.\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.","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 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment gateway","402 payment required"],"warnings":["No OpenAPI or schema documentation available — request/response format is unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","This endpoint is for a specific transaction ID (281); unclear if it generalizes to other IDs","The platform advertises many API categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/281/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/281/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response schema, and the specific endpoint is for a single hardcoded transaction ID (281) with no explanation of what the receipt contains. The docs pages are 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'/api/v1/transactions/281/receipt':110 '/docs':177 '/pricing':179 '/readme':181 '0.02':92,137 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':126 '20':120 '200':219 '281':42 '2913':127 '402 payment required' '6':133 'Base network API' 'USDC pay-per-call' 'accept':152 'access':34,166 'actual':211 'address':144 'advertis':51,165 'ai/ml':63 'analysi':66 'analyt':62 'api':59,159 'appear':215 'application/json':157 'base':8,22,100,122,129 'base-network' 'behind':43 'broader':48 'call':12,26,139 'challeng':115,221 'classif':68 'connect':187 'contain':212 'content':193 'convers':85 'crypto payment gateway' 'data':61,71,237 'decim':134 'difficult':233 'document':172,202,230 'embed':69 'endpoint':6,20,30,88,108,151 'equal':136 'estim':79 'exact':148 'exampl':205 'exchang':74 'extrem':174 'feed':73 'finance/web3':70 'form':225 'function':216 'gas':78 'gate':3,17,168 'generat':86 'geocod':83 'id':41 'infer':64 'infrastructur':81 'json-response' 'key':160 'know':235 'lack':228 'limit':163 'lowpaymentfee' 'lowpaymentfee.com':32,49 'make':231 'maxamountrequir':118 'micropay':171 'network':101 'no-api-key' 'openapi':197 'page':182 'paid':9,23 'pay':56 'pay-per-request':55 'payload':210 'payment':140 'paywal':46 'per':11,25,57,93,138 'per-cal':10,24 'platform':50,214 'post':153 'price':72,90 'probe':109 'prompt':189 'protocol':105 'provid':33 'pure':169 'quot':77 'rate':75,162 'receipt':5,19,39,209 'render':184 'request':58,94,154 'request/response':200 'return':111,156,218,239 'root':217 'schema':201 'scheme':149 'sent':142 'sentiment':65 'settl':95 'sinc':130 'span':60 'spars':175 'spec':198 'specif':37,107 'suit':53 'summar':67 'token':76 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unit':123 'usdc':14,28,97,125,131 'usdc-settlement' 'use':132,146 'util':82 'valid':84,113 'via':102 'wallet':188 'well':224 'well-form':223 'x402':2,16,45,104,114,220 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f2b3e54b-a416-49df-88c9-7a2f9ae7387e","listingId":"72ae0be1-cdd1-4648-8fb9-d522332877d0","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/281/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":"2026-04-18T19:25:48.934Z"}],"sources":[{"listingId":"72ae0be1-cdd1-4648-8fb9-d522332877d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/281/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:48.934Z","lastSeenAt":"2026-04-24T11:32:47.781Z"}],"details":{"listingId":"72ae0be1-cdd1-4648-8fb9-d522332877d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/281/receipt\n# Returns 402 with x402 challenge. Include X-PAYMENT header with signed USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/281/receipt"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/281/receipt"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipt data for transaction 281 via micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Agent-driven access to paid API endpoints without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that need keyless, pay-per-call API access on Base","Projects requiring USDC-settled API transactions"],"notFor":["Production use requiring documented request/response schemas","Bulk or high-volume data retrieval (no documented batch endpoints)","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.719Z"},"updatedAt":"2026-04-24T11:32:47.781Z"}}