Ausca

Pay-per-call APIs and MCP services for AI agents: document OCR, document analysis, media transcription, remote browser sessions, and agent email inboxes. No account, no API keys; USDC on Base per call, a signed receipt for every completed invocation.

Agents buy infrastructure the way they call tools: send the request, pay the 402 challenge within a hard USD cap you set, read the result and its settlement proof. The catalog, prices, and schemas are immutable and public at ausca.com/catalog.json; the full agent contract is ausca.com/SKILL.md.

Services and prices

Prices are the public catalog values at the time of writing; the live catalog is authoritative.

Use it in 60 seconds

MCP (Claude Desktop, Cursor, any MCP host): the local server holds your wallet and pays within your cap. Tools are derived from the live catalog.

{
  "mcpServers": {
    "ausca": {
      "command": "npx",
      "args": ["-y", "ausca", "mcp"],
      "env": {
        "AUSCA_PRIVATE_KEY": "0x...",
        "AUSCA_MAX_PAYMENT_USD": "0.50"
      }
    }
  }
}

TypeScript

import { AuscaClient } from "ausca";

const client = AuscaClient.withLocalKey({
  privateKey: process.env.AUSCA_PRIVATE_KEY, // pays USDC on Base
  maxPaymentUsd: 0.5,                        // hard per-call cap
});

const outcome = await client.invoke("browser.session", { duration_seconds: 600 });
console.log(outcome.result, outcome.payment?.transaction);

CLI

npx ausca catalog
npx ausca price document.ocr
AUSCA_PRIVATE_KEY=0x... AUSCA_MAX_PAYMENT_USD=0.50 \
  npx ausca invoke browser.session '{"duration_seconds":600}'

Python

pip install ausca

from ausca import AuscaClient

client = AuscaClient.with_local_key(private_key=key, max_payment_usd=0.50)
outcome = client.invoke("browser.session", {"duration_seconds": 600})

A remote MCP server also runs at https://ausca.com/mcp (Streamable HTTP) for discovery, preparation, and state reads; payment always signs on your side, which is why the local server exists.

How payment works

Every service is an x402 v2 payable resource. An unsigned request returns the exact payment requirement; the client pays it only if it fits your cap, then retries the same bytes with the same idempotency key, so an uncertain retry can never buy twice. Settlement is USDC on Base and every completed invocation carries a receipt with a public, hash-only verification page. Payment rails are pluggable behind one interface; the official @x402/* libraries do all signing.

Document and media services take an immutable artifact commitment instead of raw bytes: npx ausca commit file.pdf uploads through the keyless ingress and returns the commitment the offer input carries.

What is in this repository

The service runtime is not in this repository; this is the complete public buyer side. server.json carries the official MCP registry identity com.ausca/agent-services.

Links

• Agent contract: https://ausca.com/SKILL.md
• Live catalog: https://ausca.com/catalog.json
• OpenAPI: https://ausca.com/openapi.json
• x402 discovery: https://ausca.com/.well-known/x402
• Docs: https://ausca.com/docs

License

MIT