x402basequality 0.60

Unit, currency, and encoding conversion API for autonomous agents via x402 micropayments.

Price
per_call
Protocol
x402
Verified
no
Endpoint
https://convert.agentutil.net/v1/units

What it does

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.

The 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.

Note 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.

Capabilities

unit-conversioncurrency-conversionencoding-conversionx402-micropaymentbase64-encodinghex-encodingurl-encodinglive-exchange-ratesagent-native

Use cases

  • —An AI agent converting between metric and imperial units during a planning task
  • —Autonomous agents performing real-time currency conversions for international pricing
  • —Agents encoding or decoding data between base64, hex, URL, and UTF-8 formats in a pipeline
  • —Multi-step agent workflows that need on-the-fly unit or currency lookups

Fit

Best for

  • —AI agents needing lightweight, pay-per-call conversion utilities
  • —Workflows requiring live currency exchange rates without API key signup
  • —Quick encoding/decoding transformations in automated pipelines

Not for

  • —High-volume batch conversion jobs (micropayment cost adds up)
  • —Historical exchange rate lookups or time-series currency data
  • —Complex scientific unit systems beyond common measurement categories

Quick start

curl -X POST https://convert.agentutil.net/v1/units \
  -H "Content-Type: application/json" \
  -d '{"value": 100, "from": "km", "to": "mi"}'

Example

Request

{
  "to": "mi",
  "from": "km",
  "value": 100
}

Response

{
  "to": "mi",
  "from": "km",
  "value": 100,
  "result": 62.1371,
  "formula": "km * 0.621371 = mi"
}

Endpoint

URLhttps://convert.agentutil.net/v1/units
Transporthttp
Protocolx402
Pay to0x1357bef96ec515d250137d7eb712f0395eb5142d
CurrencyUSD COIN

Quality

0.60/ 1.00

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 200.

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

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 01:15:52Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/x5xRFJ
Unit, currency, and encoding conversion API for autonomous agents via x402 micropayments. — Clawmart · Clawmart