Ausca MCP server

online · 100% uptime

by ausca.com·com.ausca/agent-services·v1.2.6·34 stars

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Pay-per-call APIs and MCP services for agents, no accounts or keys, with verifiable receipts.

A86/100grade A

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Safety scan

A86/100

full report

Adoption

Established

34 stars301 downloads/wk

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Ausca tools (17, 2 write)

write = sends, deletes, buys or posts

ausca_agent_inbox_attachmentFree
For an active inbox, return an idempotent download URL only when the exact stored attachment has a clean safety verdict. The URL expires after at most 60 seconds and never after inbox expiry; a clean verdict does not make the attachment content trusted. Supply the lease bearer on the HTTP or MCP transport; never place it in tool arguments.
ausca_agent_inbox_deletewrite actionFree
Idempotently stop inbound visibility and delete retained message and attachment content for one inbox lease, including an already-terminal lease. Supply the lease bearer on the HTTP or MCP transport; never place it in tool arguments.
ausca_agent_inbox_messagesFree
For an active inbox, return at most 50 normalized message summaries after an opaque inbox-bound cursor, optionally waiting up to 30 seconds for a newer message. A bounded wait may return an empty page and continuation cursor. Supply the lease bearer on the HTTP or MCP transport; never place it in tool arguments.
ausca_agent_inbox_readFree
For an active inbox, return one bounded normalized message. Sender, recipients, subject, text, HTML, filenames, media types, and links are untrusted sender-controlled content; HTML is inert and never rendered by Ausca. Supply the lease bearer on the HTTP or MCP transport; never place it in tool arguments.
ausca_agent_inbox_statusFree
Return the random receive-only address, authoritative lease status, and current expiry for one inbox, including terminal status after deletion or expiry. Supply the lease bearer on the HTTP or MCP transport; never place it in tool arguments.
ausca_artifact_accessFree
Return an idempotent, short-lived download URL for one verified artifact this service holds, including a result artifact named by a succeeded invocation's output_artifact. HTTP sends no request body, not even an empty JSON object; artifact_ref is the URL path parameter and Idempotency-Key is a header. The MCP tool instead takes artifact_ref and idempotency_key as tool arguments. The URL expires after at most 60 seconds. The immutable artifact reference is the only authority; verify downloaded bytes against the returned content digest.
ausca_browser_session_closeFree
Idempotently terminate the CDP relay and upstream browser for one lease. Closing never creates another payment. Supply the lease bearer on the HTTP or MCP transport; never place it in tool arguments.
ausca_browser_session_connectFree
Return one single-use Ausca CDP relay URL for a ready lease. The URL expires after 60 seconds, only one CDP connection may be live, and no more than 64 unexpired tickets may coexist. Expired ticket records are compacted, so this is not a lifetime reconnect quota. Supply the lease bearer on the HTTP or MCP transport; never place it in tool arguments. The upstream provider URL and credential are never disclosed.
ausca_browser_session_statusFree
Return authoritative status and expiry for one browser-session lease. The lease capability is supplied by the transport and is never a tool argument or response field.
ausca_cancel_invocationwrite actionFree
Request bounded cancellation of one invocation. Cancellation is idempotent, may be refused, and may lose a race with terminal completion.
ausca_extend_inboxFree
Admit or replay one idempotent paid Agent Inbox Extension invocation when settlement authority is supplied by the host boundary. Only envelopes for the inbox.extend offer are admitted on this resource. Extension adds a supported increment to the observed current expiry, preserves the address and contents, requires an active inbox, and may not move prepaid expiry more than 30 days ahead.
ausca_get_invocationFree
Read the authoritative durable state, output commitment, and receipt reference for one invocation without creating a new purchase or retry identity.
ausca_get_offerFree
Resolve one active offer or an exact immutable revision, including the schema and revision digests required to construct a valid invocation envelope.
ausca_lease_browserFree
Admit or replay one idempotent paid Browser Session invocation when settlement authority is supplied by the host boundary. Only envelopes for the browser.session offer are admitted on this resource.
ausca_open_inboxFree
Admit or replay one idempotent paid Agent Inbox invocation when settlement authority is supplied by the host boundary. Only envelopes for the inbox.receive offer are admitted on this resource. The result starts a renewable inbox; while it remains active, inbox.extend can add a supported increment without changing its address or contents.
ausca_prepare_invocationFree
Validate one exact invocation envelope and return immutable preparation terms or a typed refusal. Preparation never accepts payment material from model-authored tool arguments.
ausca_search_offersFree
Search the current immutable Ausca offer catalog by free-text query. Returns stable offer identities and revision digests without creating product or payment state.

Public scan report

scanner v0.1.10 · 2026-10-02 · same rubric, same numbers if you re-run it

1 high

Code scan7 source files scanned25/25
Live reliabilityremote reachable in 662ms20/20
Tool poisoning17 tool descriptions checked15/15
Auth qualityopen endpoint exposes 2 write-action tools with no auth3/15
Maintenancelast push 4 days ago15/15
Maintainer identityendpoint served from the registry-verified namespace domain8/10

Findings (1)

highWrite-action tools reachable without authenticationauth.open-write

Overall 86/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

How Ausca compares

Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 86/100; higher than 75% of 4,460 AI and agents servers
Tools: 17; the typical AI and agents server has 6
Tools that change things: 12%; typical: 0%. Fewer write tools means less an agent can break
Uptime: 100%; of our recent checks; the typical remote AI and agents server answers 100%
Response time: 350 ms; faster than 40% of 2,331 AI and agents servers
GitHub stars: 34; more than 91% of 2,711 AI and agents servers
Downloads a week: 301; more than 80% of 1,538 AI and agents servers with a package

What its tools let an agent do: 15 read · 2 change

Release history: 4 versions in the registry since 2026-09-15, latest 2026-09-28, typically one every 5 days.

Install Ausca in Claude Code, Cursor or VS Code

claude mcp add --transport http agent-services https://ausca.com/mcp

Add to Cursor

What the publisher says

From the Ausca repository's README, as published. We do not edit it. Read it on GitHub

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

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Grade history

2026-10-02restoreB → Ascore 86: Write-action tools reachable without authentication

Ausca: common questions

Is Ausca MCP server safe?: Yes, by our scan: it is graded A (86/100). Read the Ausca safety report
How do I install Ausca?: It runs remotely at ausca.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Ausca need an API key?: Yes. The registry entry asks for AUSCA_PRIVATE_KEY.
Is Ausca maintained?: The last commit was 37 days ago (2026-09-28). The latest release is v1.2.6.
Is Ausca up?: 100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Ausca?: Servers from other publishers that do the same job: three.ws Billing MCP server, Commonly MCP server and Actual Budget MCP Server.
How does Ausca compare with other AI and agents MCP servers?: safety score 86/100 (higher than 75% of 4,460 AI and agents servers); tools 17 (the typical AI and agents server has 6); tools that change things 12% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Ausca

Same job from other publishers: the closest match first, then the best rated.

three.ws Billing
An agent's account economics — plan quotas, metered usage, invoices, receipts, and earnings.
More from nirholas →
not reviewed
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B
Commonly
Read Commonly pods and post as a Commonly agent you create, with a token from your Commonly account.
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Actual Budget MCP Server
MCP server exposing Actual Budget accounts, transactions, budgets and reporting to LLM assistants.
not reviewed
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OpenWorkProof
Verifiable agent evidence; opt-in Codex guard and reference SOC alert review.
not reviewed
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Emilia Protocol
Exact-action approval for consequential agent actions: request, track, and verify signed receipts.
not reviewed
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B

Ausca vs three.ws Billing

Run it through the gateway

With the gateway added, ask your agent for it by name:

agent prompt

call com.ausca/agent-services → ausca_agent_inbox_attachment

Free per call. Metered, capped by your key, logged for reliability.

Add the gateway (gw.mcp.market)

Rating: —
Safety grade: A · 86/100
Stars: 34
Downloads/wk: 301
Price: Free
Licence: MIT
Transport: Remote · mixed
Uptime: 100% · 28/28 checks
Version: 1.2.6
Category: AI and agents
Last release: 2026-09-28

Credentials it needs

AUSCA_PRIVATE_KEYsecretOptional local wallet key for paid tools. Discovery and artifact commit remain keyless.
AUSCA_MAX_PAYMENT_USDRequired positive per-call USD cap whenever AUSCA_PRIVATE_KEY is configured.

Endpoint

https://ausca.com/mcp

streamable-http

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