{"id":"beb079ce-af26-405f-b962-489290f74b45","shortId":"HQshj5","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource via the x402 payment protocol. The specific path `/api/v1/transactions/21/receipt` returns a receipt for transaction ID 21 in JSON format, gated behind a per-request USDC micropayment on the Base network.\n\nThe endpoint is live and returns a standard x402 challenge (HTTP 402) requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The method is POST and the response MIME type is application/json.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs across categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text 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. No API keys, rate limits, or commitments are required. However, the specific endpoint being listed here is a transaction receipt resource, and documentation beyond the landing page is essentially empty (all other pages just show a \"Connect wallet\" prompt), so the actual response schema and detailed behavior are unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","json-response","no-api-key","per-request-billing"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","payment receipt","crypto receipt endpoint"],"warnings":["No API documentation available — all doc pages return only a 'Connect wallet' prompt","No response schema or example response provided for this endpoint","The specific endpoint /api/v1/transactions/21/receipt is not listed among the advertised APIs on the landing page","Unclear what data the receipt contains or whether transaction ID 21 is a real or demo resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/21/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/21/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and no description of what the receipt payload contains. All doc/pricing/API pages beyond the landing page are blank ('Connect wallet' only). The specific endpoint path (transaction 21 receipt) is not mentioned on the landing page, making its purpose 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'0.02':10,24,98,177 '000':87 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':109 '0x8335':92 '20':86 '21':53 '2913':93 '300':112 '402':80 '6':102 'Base network API' 'USDC pay-per-call' 'across':138 'actual':221 'address':108 'advertis':130 'ai':148 'analysi':152 'analyt':142 'api':137,181 'application/json':125 'base':8,22,67,88,95 'base-network' 'behavior':226 'behind':58 'beyond':203 'broader':127 'categori':139 'challeng':78 'classif':155 'commit':186 'connect':216 'convers':172 'crypto receipt endpoint' 'data':141,145 'decim':103 'detail':225 'document':202 'embed':156 'empti':209 'endpoint':6,20,30,70,192 'equal':97 'essenti':208 'estim':166 'exact':83 'exchang':161 'export':146 'feed':160 'financ':157 'format':56 'gas':165 'gate':3,17,57,136 'generat':173 'geocod':170 'howev':189 'http':79 'id':52 'includ':140 'infrastructur':168 'insight':147 'json':55 'json-response' 'key':182 'land':205 'learn':150 'limit':184 'list':194 'live':72 'lowpaymentfee' 'lowpaymentfee.com':32,128 'machin':149 'method':116 'metric':143 'micropay':64 'mime':122 'network':68 'no-api-key' 'page':206,212 'path':45 'pay':9,23 'payment':41,84,104 'payment receipt' 'per':13,27,61,178 'per-request':60 'per-request-billing' 'platform':129 'post':118 'price':159,175 'prompt':218 'protocol':42 'provid':33 'quot':164 'rate':162,183 'receipt':5,19,36,49,199 'report':144 'request':14,28,62,179 'requir':81,188 'resourc':37,200 'respons':121,222 'return':47,74 'schema':223 'second':113 'sent':106 'sentiment':151 'show':214 'specif':44,191 'standard':76 'suit':132 'summar':154 'text':153 'timeout':114 'token':163 'transact':4,18,35,51,198 'transaction receipt API' 'transaction-receipt' 'type':123 'unit':89 'unknown':228 'usd':99 'usdc':12,26,63,91,100 'usdc-micropayment' 'use':101 'util':169 'valid':171 'via':38 'wallet':217 'web3':158 'x402':2,16,40,77,135 'x402 micropayment endpoint' 'x402-gated':1,15,134 'x402-payment'","prices":[{"id":"345a023d-9cf7-4d86-b082-c288c1e69e9f","listingId":"beb079ce-af26-405f-b962-489290f74b45","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/21/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":"2026-04-18T18:59:18.121Z"}],"sources":[{"listingId":"beb079ce-af26-405f-b962-489290f74b45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/21/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:18.121Z","lastSeenAt":"2026-04-24T17:03:04.581Z"}],"details":{"listingId":"beb079ce-af26-405f-b962-489290f74b45","quickStartSnippet":"# The endpoint requires an x402 payment header. A 402 response returns the challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/21/receipt\n# Returns 402 with x402 challenge. Use an x402-compatible client to attach\n# the USDC payment header and retry the request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/21/receipt"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/21/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 after completing a payment on the platform","Programmatic verification of transaction details via receipt lookup","Agent-driven workflows that need proof-of-transaction data"],"bestFor":["Agents needing pay-per-call access without API key management","Micropayment-gated receipt retrieval on Base","Developers experimenting with x402 protocol integrations"],"notFor":["Bulk or high-volume receipt retrieval where per-call costs add up","Use cases requiring detailed API documentation or guaranteed SLAs","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.622Z"},"updatedAt":"2026-04-24T17:03:04.581Z"}}