{"id":"6bd2c40d-f147-4a7f-a34e-d5e96a6b7e08","shortId":"tCb7nP","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" transaction receipt resource. When called via POST at `/api/v1/transactions/250/receipt`, it returns a JSON receipt for transaction ID 250. Payment is handled inline via the x402 protocol: callers attach an X-PAYMENT header with a USDC payment on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe provider's landing page advertises a broader suite of endpoints spanning 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 uniformly at $0.02 per request. No API keys or rate limits are advertised; access is instant via x402 payment on the Base L2 network.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific endpoint probed (`/api/v1/transactions/250/receipt`) is live and returns a valid x402 402 challenge, but what exactly the receipt payload contains is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found; request and response formats are unknown","The specific data returned by /api/v1/transactions/250/receipt is undocumented","The broader suite of advertised endpoints (AI, analytics, finance, utils) could not be verified beyond the landing page listing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/250/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/250/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 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of this particular receipt endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/transactions/250/receipt':55,218 '/docs':179 '/pricing':180 '/readme':183 '/request':17,34 '0.02':16,33,93,152 '000':95 '20':94 '250':64 '402':226 '6':101 'Base network API' 'USDC micropayment API' 'access':46,163 'advertis':108,162 'ai':122 'analysi':126 'analyt':116 'api':45,156 'attach':74 'avail':210 'base':9,26,86,96,171 'broader':110 'call':4,21,51 'caller':73 'challeng':227 'classif':129 'connect':189 'contain':234 'convers':146 'crawl':213 'crypto payment API' 'data':115,119 'decim':102 'detail':196 'document':174,205 'embed':130 'enabl':38 'endpoint':7,24,39,113,216 'estim':140 'exact':230 'exampl':209 'exchang':135 'export':120 'extrem':176 'feed':134 'financ':131 'gas':139 'generat':147 'geocod':144 'handl':67 'header':79 'id':63 'infrastructur':142 'inlin':68 'insight':121 'instant':165 'json':59 'json-response' 'key':157 'l2':172 'land':106 'learn':124 'limit':160 'live':220 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':123 'metric':117 'network':87,173 'no-api-key' 'openapi':200 'page':107,184 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payload':233 'payment':65,78,83,168 'per':3,20,90,153 'post':53 'premium':44 'price':89,133,149 'probe':217 'prompt':191 'protocol':72 'provid':42,104 'quot':138 'rate':136,159 'receipt':6,23,48,60,232 'render':186 'report':118 'request':91,154 'request/response':203 'resourc':49 'return':57,222 'schema':204 'sentiment':125 'settl':12,29 'span':114 'spars':177 'spec':201 'specif':215 'suit':111 'summar':128 'technic':195 'text':127 'token':137 'transact':5,22,47,62 'transaction receipt API' 'transaction-receipt' 'uniform':150 'unit':97 'unknown':236 'usag':208 'usdc':14,31,82,99 'usdc-base-network' 'util':143 'valid':145,224 'via':10,27,52,69,166 'wallet':190 'web3':132 'x':77 'x-payment':76 'x402':11,28,37,71,167,225 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"1ea702e5-8769-4aad-81b0-1df22637744f","listingId":"6bd2c40d-f147-4a7f-a34e-d5e96a6b7e08","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/250/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":"2026-04-18T18:59:27.043Z"}],"sources":[{"listingId":"6bd2c40d-f147-4a7f-a34e-d5e96a6b7e08","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/250/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:27.043Z","lastSeenAt":"2026-04-24T16:03:18.220Z"}],"details":{"listingId":"6bd2c40d-f147-4a7f-a34e-d5e96a6b7e08","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/250/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/250/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 provider advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction receipts programmatically with per-call USDC payment","Integrating pay-as-you-go API access into agent workflows without API key management","Accessing financial or transactional data via x402 protocol on Base L2"],"bestFor":["Agents or applications that need keyless, pay-per-call API access","Developers building on Base network who want frictionless micropayment APIs","Workflows requiring transaction receipt retrieval with no subscription commitment"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume use cases where per-request pricing at $0.02 may be cost-prohibitive compared to subscription APIs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.231Z"},"updatedAt":"2026-04-24T16:03:18.220Z"}}