{"id":"49886ba4-3c92-42b2-b2b1-c212f9191209","shortId":"KUS4KZ","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 381) 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/381/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 translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No API keys or rate limits are advertised; access is granted purely through per-request payment.\n\nDocumentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any of the listed endpoints. The actual data returned by this receipt endpoint is unknown beyond the stated mimeType of application/json.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","transaction-receipt","no-api-key","pay-per-use"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call API","crypto payment gateway"],"warnings":["No OpenAPI schema or endpoint documentation available — all doc pages render only 'Connect wallet'","The specific endpoint is for a single transaction receipt (ID 381); unclear if this generalizes","No request body schema or response schema documented","No examples of successful responses available","The broader platform lists many endpoints but none have been verified beyond this one"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/381/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/381/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 pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific endpoint (transaction 381 receipt) is narrow and its output format is undocumented. This is effectively a stub 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'0.02':93,139 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '0x8335':127 '20':121 '2913':128 '381':42 '6':134 'Base network API' 'USDC micropayment API' 'access':34,168 'actual':218 'address':158 'advertis':51,147,167 'ai/ml':63 'analysi':66 'analyt':62 'api':59,161,183 'application/json':232 'base':8,22,101,123,130 'behind':43 'beyond':227 'broader':48 'call':12,26,141 'challeng':116 'classif':68 'connect':192 'consist':142 'content':198 'convers':86 'crypto payment gateway' 'data':61,72,219 'decim':135 'detail':209 'doc':182 'document':177,210 'embed':69 'endpoint':6,20,30,89,109,216,224 'estim':80 'exact':155 'exampl':206 'exchang':75 'extrem':179 'feed':74 'financ':70 'gas':79 'gate':3,17 'generat':87 'geocod':84 'grant':170 'id':41 'infer':64 'infrastructur':82 'key':162 'limit':165 'list':215 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':151 'maxamountrequir':119 'mimetyp':230 'network':102 'no-api-key' 'openapi':202 'page':187 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'pay-per-use' 'payment':149,176 'paywal':46 'per':11,25,57,94,140,174 'per-cal':10,24 'per-request':173 'per-request-billing' 'platform':50 'price':73,91,148,184 'probe':110 'prompt':194 'protocol':106 'provid':33 'pure':171 'quot':78 'rate':76,164 'readm':186 'receipt':5,19,39,223 'render':189 'request':58,95,175 'request/response':205 'return':112,220 'schema':203 'scheme':156 'sentiment':65 'settl':96 'sinc':131 'site':145 'span':60 'specif':37,108 'state':229 'substant':197 'suit':53 'summar':67 'thin':180 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':137 'unit':124 'unknown':226 'usdc':14,28,98,126,132 'usdc-base' 'use':133 'util':83 'valid':85,114 'via':103,152 'wallet':193 'web3':71 'x402':2,16,45,105,115,154 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"132dad27-d823-4d3b-b250-94eb37695cd9","listingId":"49886ba4-3c92-42b2-b2b1-c212f9191209","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/381/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":"2026-04-18T19:26:37.444Z"}],"sources":[{"listingId":"49886ba4-3c92-42b2-b2b1-c212f9191209","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/381/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:37.444Z","lastSeenAt":"2026-04-24T05:03:16.409Z"}],"details":{"listingId":"49886ba4-3c92-42b2-b2b1-c212f9191209","quickStartSnippet":"# The endpoint requires an x402 payment header. First, obtain the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/381/receipt\n# Returns 402 with x402 challenge. Construct X-PAYMENT header per x402 spec,\n# paying 20000 base units ($0.02) USDC on Base to 0x1A2B...85F3, then retry:\ncurl -X POST -H \"X-PAYMENT: <signed_payment>\" https://lowpaymentfee.com/api/v1/transactions/381/receipt","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/381/receipt"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/381/receipt"},{"claim":"Platform advertises AI/ML, finance, data analytics, and infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 381 via a single paid API call","Demonstrating x402 protocol integration for per-request micropayments on Base","Accessing paid API services without traditional API key registration"],"bestFor":["Developers experimenting with x402 payment protocol integration","Agents that need to make one-off paid API calls without account setup","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume batch retrieval where per-request pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.406Z"},"updatedAt":"2026-04-24T05:03:16.409Z"}}