{"id":"5dc220eb-ed7d-4ba7-8ff1-ad407f41fb68","shortId":"NHs9B5","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 243) 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/243/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 gated purely by per-request micropayment.\n\nDocumentation 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 examples of what the receipt payload actually contains. The endpoint is live and responding with a proper 402 challenge, but the lack of documentation makes it difficult to know what data is returned or what input parameters (if any) are expected in the POST body.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment gateway"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","Endpoint appears to serve a single fixed resource (transaction ID 243) — unclear if this is a demo or production endpoint","No response schema or example output available; impossible to verify what data is actually returned","The broader platform advertises many API categories (AI, finance, analytics, etc.) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/243/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/243/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 OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples. The endpoint path suggests a single fixed resource (transaction 243) rather than a general-purpose API. Effectively a stub 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'/api/v1/transactions/243/receipt':111 '/docs':182 '/pricing':184 '/readme':186 '0.02':93,139 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '0x8335':127 '20':121 '243':42 '2913':128 '402':227 '6':134 'Base network API' 'USDC pay-per-call' 'access':34,168 'actual':216 'address':158 'advertis':51,147,167 'ai/ml':63 'analysi':66 'analyt':62 'api':59,161 'base':8,22,101,123,130 'base-network' 'behind':43 'bodi':254 'broader':48 'call':12,26,141 'challeng':116,228 'classif':68 'connect':192 'consist':142 'contain':217 'content':198 'convers':86 'crypto payment gateway' 'data':61,72,240 'decim':135 'difficult':236 'document':177,207,233 'embed':69 'endpoint':6,20,30,89,109,219 'estim':80 'exact':155 'exampl':210 'exchang':75 'expect':250 'extrem':179 'feed':74 'financ':70 'gas':79 'gate':3,17,170 'generat':87 'geocod':84 'id':41 'infer':64 'infrastructur':82 'input':245 'key':162 'know':238 'lack':231 'limit':165 'live':221 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':151 'make':234 'maxamountrequir':119 'micropay':176 'micropayment API' 'network':102 'no-api-key' 'openapi':202 'page':187 'paid':9,23 'paramet':246 'pay':56 'pay-per-request':55 'payload':215 'payment':149 'paywal':46 'per':11,25,57,94,140,174 'per-cal':10,24 'per-request':173 'platform':50 'post':253 'price':73,91,148 'probe':110 'prompt':194 'proper':226 'protocol':106 'provid':33 'pure':171 'quot':78 'rate':76,164 'receipt':5,19,39,214 'render':189 'request':58,95,175 'request/response':205 'respond':223 'return':112,242 'schema':206 'scheme':156 'sentiment':65 'settl':96 'sinc':131 'site':145 'span':60 'spec':203 'specif':37,108 'suit':53 'summar':67 'thin':180 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':137 'unit':124 'usdc':14,28,98,126,132 'usdc-micropayment' 'use':133 'util':83 'valid':85,114 'via':103,152 'wallet':193 'web3':71 'x402':2,16,45,105,115,154 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"67b59586-92ff-46c4-9a16-a5b01cdfce87","listingId":"5dc220eb-ed7d-4ba7-8ff1-ad407f41fb68","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/243/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":"2026-04-18T18:59:27.024Z"}],"sources":[{"listingId":"5dc220eb-ed7d-4ba7-8ff1-ad407f41fb68","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/243/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:27.024Z","lastSeenAt":"2026-04-24T15:32:37.884Z"}],"details":{"listingId":"5dc220eb-ed7d-4ba7-8ff1-ad407f41fb68","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/243/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/243/receipt"}],"useCases":["Retrieving transaction receipt data for transaction 243 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Agent-driven programmatic access to paid data without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that need keyless, pay-per-call API access on Base","Projects exploring USDC-settled per-request pricing models"],"notFor":["Production workloads requiring documented request/response schemas","Users who need bulk or subscription-based access to transaction data","Anyone needing receipts for transactions other than ID 243 (this is a single-resource endpoint)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.245Z"},"updatedAt":"2026-04-24T15:32:37.884Z"}}