{"id":"a3113c62-f30d-4b97-81af-2832357791e1","shortId":"7ckwJQ","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 a transaction receipt resource (specifically for transaction ID 15) 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 minimum commitments.\n\nThe specific probed endpoint (`/api/v1/transactions/15/receipt`) returns a valid x402 challenge requesting up to 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 the specified payTo address. 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 substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose and payload of a \"transaction receipt\" are not documented, so the actual data returned after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found for request or response payloads.","The endpoint is scoped to a single transaction ID (15); it is unclear whether this is a demo or a general-purpose resource.","The actual data returned after successful payment is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/15/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/15/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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty. The specific purpose of a 'transaction receipt' for ID 15 is unexplained, making this effectively a stub 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'0.02':93,145 '000':128 '0x8335':133 '15':42 '20':127 '2913':134 '6':140 'Base network API' 'USDC micropayment API' 'accept':170 'actual':225 'address':167 'advertis':51,153 'ai':63 'analysi':67 'analyt':62 'api':59,105,182 'application/json':175 'avail':211 'base':8,22,101,129,136 'base-network' 'behind':43 'broader':48 'call':12,26,147 'challeng':123 'classif':69 'commit':113 'connect':191 'consist':148 'content':197 'convers':86 'data':61,226 'decim':141 'doc':181 'document':176,206,222 'embed':70 'endpoint':6,20,30,89,117,169 'estim':80 'exact':161 'exampl':210 'exchang':75 'extrem':178 'feed':74 'financ':71 'gas':79 'gate':3,17 'generat':87 'geocod':84 'id':41 'infrastructur':82 'json-response' 'key':106 'learn':65 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'made':157 'minimum':112 'network':102 'openapi':201 'page':186 'paid':9,23 'pay':56 'pay-per-request':55 'pay-per-request API' 'payload':215 'payment':155,229 'payto':166 'paywal':46 'per':11,25,57,94,146 'per-cal':10,24 'per-call-pricing' 'platform':50 'post':171 'post-method' 'price':73,91,154,183 'probe':116 'prompt':193 'provid':33 'purpos':213 'quot':78 'rate':76,108 'readm':185 'receipt':5,19,36,219 'render':188 'request':58,95,124,172 'request/response':204 'resourc':37 'return':119,174,227 'schema':205 'scheme':162 'sentiment':66 'settl':96 'sinc':137 'site':151 'span':60 'spars':179 'spec':202 'specif':38,115 'specifi':165 'substant':196 'suit':53 'summar':68 'token':77 'transact':4,18,35,40,218 'transaction receipt API' 'transaction-receipt' 'translat':143 'unit':130 'unknown':231 'usag':209 'usdc':14,28,98,132,138 'usdc-settlement' 'use':139 'util':83 'valid':85,121 'via':158 'wallet':192 'web3':72 'x402':2,16,45,122,160 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"00bbfa06-f3b1-492c-a9cc-f025068a4482","listingId":"a3113c62-f30d-4b97-81af-2832357791e1","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/15/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":"2026-04-18T18:58:43.071Z"}],"sources":[{"listingId":"a3113c62-f30d-4b97-81af-2832357791e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/15/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:43.071Z","lastSeenAt":"2026-04-24T22:32:56.343Z"}],"details":{"listingId":"a3113c62-f30d-4b97-81af-2832357791e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/15/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/15/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 for transaction ID 15 via micropayment","Demonstrating x402 protocol payment flows on Base","Integrating pay-per-call APIs without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Use cases requiring low-friction micropayment-gated data retrieval"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume data retrieval where per-call pricing is inefficient","Users who need traditional API key authentication and rate limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.29Z"},"updatedAt":"2026-04-24T22:32:56.343Z"}}