{"id":"fd58108b-9bf9-46e9-aed3-56e3c6365c17","shortId":"LTQbZG","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 endpoint at lowpaymentfee.com provides a transaction receipt retrieval service behind an x402 paywall. When called via POST, it returns a JSON receipt for transaction ID 129. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. Payment is handled entirely through the x402 protocol on the Base L2 network.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 crawled material. The specific endpoint probed (/api/v1/transactions/129/receipt) is live and returns a valid x402 challenge, but its actual response payload structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt","payment receipt","x402 API","USDC micropayment","Base network API","pay-per-request","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content.","No OpenAPI or JSON schema describing request parameters or response format.","The endpoint path includes a hardcoded transaction ID (129); it is unclear whether other transaction IDs are supported or how to discover them.","The broader platform lists many endpoints (AI, finance, utilities) but none could be verified beyond the landing page descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/129/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/129/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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the docs pages are all empty wallet-connect stubs. The specific endpoint path (/transactions/129/receipt) suggests a hardcoded resource rather than a parameterized API. Very little can be verified about what the endpoint actually 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'/api/v1/transactions/129/receipt':210 '/docs':170 '/pricing':172 '/readme':174 '/request':17,34 '0.02':16,33,85,137 '000':80 '0x8335':72 '129':61 '20':79 '2913':73 '6':90 'Base network API' 'USDC micropayment' 'actual':221 'advertis':96 'ai/ml':108 'analysi':111 'analyt':107 'api':104,142 'avail':201 'base':9,26,67,81,162 'base-network' 'behind':45 'broader':93 'call':4,21,50,103 'challeng':218 'classif':113 'commit':150 'connect':180 'contract':71 'convers':130 'cost':77 'crawl':204 'data':106,116 'decim':91 'detail':187 'document':165,196 'embed':114 'endpoint':7,24,36,133,208 'entir':155 'equal':84 'estim':124 'exampl':200 'exchang':119 'extrem':167 'feed':118 'finance/web3':115 'gas':123 'generat':131 'geocod':128 'handl':154 'id':60 'infer':109 'infrastructur':126 'json':56 'key':143 'l2':163 'limit':146 'list':135 'live':212 'lowpaymentfee' 'lowpaymentfee.com':38,94 'materi':205 'maximum':76 'minimum':149 'network':68,164 'no-api-key' 'openapi':191 'page':175 'pay':2,19,101 'pay-per-cal':1,18,100 'pay-per-call' 'pay-per-request' 'payload':223 'payment':62,152 'payment receipt' 'paywal':48 'per':3,20,86,102,138 'platform':95 'post':52 'price':117 'probe':209 'prompt':182 'protocol':159 'provid':39 'quot':122 'rate':120,145 'receipt':6,23,42,57 'render':177 'request':87,139 'request/response':194 'requir':151 'respons':222 'retriev':43 'return':54,214 'schema':195 'sentiment':110 'servic':44 'settl':12,29,64 'span':105 'spars':168 'spec':192 'specif':207 'structur':224 'suit':98 'summar':112 'technic':186 'token':121 'transact':5,22,41,59 'transaction receipt' 'transaction-receipt' 'unit':82 'unknown':226 'usag':199 'usdc':14,31,70,88 'usdc-settlement' 'use':69,89 'util':127 'valid':129,216 'via':10,27,51 'wallet':181 'x402':11,28,47,158,217 'x402 API' 'x402-payment'","prices":[{"id":"997637e8-d766-47a2-ba6f-622c92e772c8","listingId":"fd58108b-9bf9-46e9-aed3-56e3c6365c17","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/129/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":"2026-04-18T18:58:31.588Z"}],"sources":[{"listingId":"fd58108b-9bf9-46e9-aed3-56e3c6365c17","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/129/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:31.588Z","lastSeenAt":"2026-04-25T00:05:09.606Z"}],"details":{"listingId":"fd58108b-9bf9-46e9-aed3-56e3c6365c17","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/129/receipt \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transactions/129/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 lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/129/receipt"}],"useCases":["Retrieving a transaction receipt for a specific transaction ID","Programmatic proof-of-payment or audit trail retrieval","Agent-driven workflows that need verifiable transaction records"],"bestFor":["Agents needing on-demand transaction receipts without API key management","Micropayment-settled receipt lookups on Base L2","Workflows requiring no-signup, instant-access API calls"],"notFor":["Bulk or batch receipt retrieval (no documented batch endpoint)","Users who need detailed API documentation or response schema guarantees before integrating","Non-crypto-native callers who cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.827Z"},"updatedAt":"2026-04-25T00:05:09.606Z"}}