{"id":"43d1d61b-a0a8-499c-bed0-d99f151bcb80","shortId":"x5xRFJ","kind":"x402","title":"Unit, currency, and encoding conversion API for autonomous agents via x402 micropayments.","tagline":"Unit, currency, and encoding conversion API for autonomous agents via x402 micropayments.","description":"AgentUtil Convert is a lightweight conversion service designed for autonomous AI agents. It exposes three POST endpoints: `/v1/units` for physical unit conversions (length, weight, temperature, volume, data), `/v1/currency` for live exchange-rate currency conversions, and `/v1/encoding` for text encoding transformations between utf8, base64, hex, and url formats.\n\nThe service offers a free tier of 10 requests per day per IP with no signup required. Beyond that, it uses the x402 protocol to accept micropayments of $0.001 per request in USDC on the Base chain. The OpenAPI 3.1.0 spec is well-defined with clear request/response schemas for all three endpoints.\n\nNote that during probing, the `/v1/units` endpoint returned HTTP 400 on POST (likely due to missing required body fields) rather than the expected 402 payment challenge, and returned 404 on GET. The root landing page is live (HTTP 200) and serves a simple web-based conversion UI. No dedicated documentation, pricing, or README pages were found beyond the OpenAPI spec itself.","tags":[],"capabilities":["unit-conversion","currency-conversion","encoding-conversion","x402-micropayment","base64-encoding","hex-encoding","url-encoding","live-exchange-rates","agent-native"],"categories":["utility","conversion"],"synonyms":["unit converter API","currency exchange API","encoding converter","measurement conversion","base64 hex converter","agent utility","micropayment conversion service","x402 converter"],"warnings":["x402 payment challenge was not captured during probing — endpoint returned 400 on POST (missing body) and 404 on GET, so x402 liveness is unconfirmed","No dedicated documentation, pricing, or README pages found (all return 404)","Response example is inferred from the OpenAPI schema, not from an actual observed response"],"endpointUrl":"https://convert.agentutil.net/v1/units","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","openapi":"https://convert.agentutil.net/openapi.json","version":"2","docs_url":"https://convert.agentutil.net/.well-known/agent-service.json","free_tier":"10 queries/day without payment","description":"Convert between units of measurement"},"payTo":"0x1357bef96ec515d250137d7eb712f0395eb5142d","amount":"1000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.600","qualityRationale":"Full OpenAPI 3.1.0 schema with clear request/response definitions and pricing metadata. However, the x402 402 challenge was not captured (endpoint returned 400, likely needing a valid body), no dedicated docs pages exist, and the response example is inferred from the schema rather than observed. The service appears live based on the root page returning 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'page':160,180 'payment':150 'per':82,84,102 'physic':44 'post':40,137 'price':177 'probe':129 'protocol':96 'rate':57 'rather':145 'readm':179 'request':81,103 'request/response':120 'requir':89,142 'return':133,153 'root':158 'schema':121 'serv':166 'servic':31,74 'signup':88 'simpl':168 'spec':113,186 'temperatur':49 'text':63 'three':39,124 'tier':78 'transform':65 'ui':173 'unit':1,13,45 'unit converter API' 'unit-conversion' 'url':71 'url-encoding' 'usdc':105 'use':93 'utf8':67 'via':10,22 'volum':50 'web':170 'web-bas':169 'weight':48 'well':116 'well-defin':115 'x402':11,23,95 'x402 converter' 'x402-micropayment'","prices":[{"id":"b7763617-e039-4df1-bfba-6d73f05489a2","listingId":"43d1d61b-a0a8-499c-bed0-d99f151bcb80","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x1357bef96ec515d250137d7eb712f0395eb5142d","paymentMethod":"x402-usd 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