{"id":"f79de9c1-e02a-43ca-86b0-d7fd8b28ce8f","shortId":"FVWEvx","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 83) 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 endpoint probed — `/api/v1/transactions/83/receipt` — returned a valid x402 challenge with a `maxAmountRequired` of 20,000 base units of USDC (0x8335… 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 on the site is extremely thin — 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 usage examples available. The nature of what the \"transaction receipt\" contains is not documented, making it difficult to assess the endpoint's practical utility without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific purpose and contents of the transaction 83 receipt are undocumented","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/83/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/83/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of this specific transaction receipt endpoint is unclear. The broader site lists many APIs but provides zero documentation beyond titles and 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'0.02':93,145 '000':129 '0x8335':134 '20':128 '6':140 '83':42 'Base network API' 'USDC micropayment API' 'accept':170 'access':34 'address':167 'advertis':51,153 'ai':63 'analysi':67 'analyt':62 'api':59,105,185 'application/json':175 'assess':230 'avail':214 'base':8,22,101,130,136 'base-network' 'behind':43 'broader':48 'call':12,26,147 'challeng':123 'classif':69 'commit':113 'connect':194 'consist':148 'contain':222 'content':200 'convers':86 'data':61 'decim':141 'difficult':228 'doc':184 'document':176,209,225 'embed':70 'endpoint':6,20,30,89,116,169,232 'estim':80 'exact':161 'exampl':213 'exchang':75 'extrem':181 '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 'make':226,237 'maxamountrequir':126 'minimum':112 'natur':216 'network':102 'no-api-key' 'openapi':204 'page':189 'paid':9,23,239 'pay':56 'pay-per-request':55 'pay-per-request API' 'payment':155 'payto':166 'paywal':46 'per':11,25,57,94,146 'per-cal':10,24 'per-call-pricing' 'platform':50 'post':171 'practic':234 'price':73,91,154,186 'probe':117 'prompt':196 'provid':33 'quot':78 'rate':76,108 'readm':188 'receipt':5,19,39,221 'render':191 'request':58,95,172,240 'request/response':207 'return':119,174 'schema':208 'scheme':162 'sentiment':66 'settl':96 'sinc':137 'site':151,179 'span':60 'spec':205 'specif':37,115 'specifi':165 'suit':53 'summar':68 'thin':182 'token':77 'transact':4,18,38,40,220 'transaction receipt API' 'transaction-receipt' 'translat':143 'unit':131 'usag':212 'usdc':14,28,98,133,138 'usdc-settlement' 'use':139 'util':83,235 'valid':85,121 'via':158 'wallet':195 'web3':72 'without':236 'x402':2,16,45,122,160 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a982b77b-5485-45be-9ab6-3d36e5e45d15","listingId":"f79de9c1-e02a-43ca-86b0-d7fd8b28ce8f","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/83/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":"2026-04-18T19:27:13.690Z"}],"sources":[{"listingId":"f79de9c1-e02a-43ca-86b0-d7fd8b28ce8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/83/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:13.690Z","lastSeenAt":"2026-04-23T23:03:17.248Z"}],"details":{"listingId":"f79de9c1-e02a-43ca-86b0-d7fd8b28ce8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/83/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/83/receipt"},{"claim":"All endpoints 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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/83/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 83 via a single paid API call","Demonstrating x402 payment protocol integration for agent-to-agent commerce","Testing micropayment flows on the Base L2 network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call API access without API key management","Low-cost micropayment API consumption on Base"],"notFor":["Production workloads requiring documented request/response schemas","Bulk data retrieval or high-throughput analytics","Users who need detailed API documentation before purchasing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.679Z"},"updatedAt":"2026-04-23T23:03:17.248Z"}}