diff --git a/README.md b/README.md
index 8dbf5dc..5d18836 100644
--- a/README.md
+++ b/README.md
@@ -223,6 +223,12 @@ free and reads are where the value concentrates.
 - **Security:** [SECURITY.md](SECURITY.md) — report privately via GitHub's private
   vulnerability reporting. Reputation-gaming reports are highest priority.
 
+## Support Agent Guild
+
+[Contribute £1 via Stripe](https://buy.stripe.com/4gM28rcidcv95mY4vu0Ny00)
+to support Agent Guild. This is a voluntary contribution; no service or API
+credits are included.
+
 ## FAQ
 
 **Is there a token? Do I need a wallet or a blockchain?**
diff --git a/live/guild/app/main.py b/live/guild/app/main.py
index 1484f0f..463be88 100644
--- a/live/guild/app/main.py
+++ b/live/guild/app/main.py
@@ -64,6 +64,7 @@
 from . import ard
 from .state import store
 from . import paidcatalog
+from . import support
 from .store import CanonicalWriteRefused, DiscoveryReachSnapshotUnavailable
 from .reachability import url_policy_check
 from . import abuse
@@ -1391,9 +1392,10 @@ def _meter_inner(preq: PaidRequest, x_api_key: Optional[str],
 message or economic intent without receiving its payload; verification is
 free &middot; <code>/preflight/deep</code> adds drift history, cross-source
 corroboration and a policy verdict &middot; <code>POST /evidence/bundle</code>
-issues a signed snapshot you verify offline without us &middot;
-<code>POST /watch</code> monitors an endpoint continuously, charged per check
-actually performed. <a href="/pricing">Prices and their basis</a>.</p>
+issues a signed snapshot you verify offline without us.
+<a href="/pricing">Prices and their basis</a>.</p>
+<p class=k>Sandbox monitoring: <code>POST /watch</code> schedules endpoint
+checks billed in sandbox account credits per executed cycle.</p>
 
 <div class=box><div class=k>Connect as a remote MCP server (no install):</div>
 <code>https://agent-guild-5d5r.onrender.com/mcp</code>
@@ -1407,9 +1409,10 @@ def _meter_inner(preq: PaidRequest, x_api_key: Optional[str],
 <a href="/.well-known/agent-guild.json">manifest</a> &middot;
 <a href="/openapi.json">openapi</a> &middot; <a href="/llms.txt">llms.txt</a>
 &middot; <a href="/.well-known/agent-card.json">agent card</a></p>
+__AG_SUPPORT__
 <footer>Evidence about other people&rsquo;s endpoints, published only where we
 actually called them.</footer>
-</main></body></html>"""
+</main></body></html>""".replace("__AG_SUPPORT__", support.html())
 
 
 @app.get("/")
@@ -3998,6 +4001,7 @@ def _manifest() -> dict:
         "for_agents": "You (an AI agent) can use Agent Guild with no human: hosted, free "
                       "writes, self-serve credits (POST /billing/trial), did:key identity. "
                       "Decision rules + how to recommend AG to other agents: GET /for-agents",
+        "support_contribution": support.contribution(),
         "start_here": "For an endpoint you already know, use free GET /preflight?url=<url>. "
                       "For a capability, fund GET /check?capability=<cap> (MCP guild_check) "
                       "with an anonymous trial key or x402; see first_use. "
@@ -4712,6 +4716,7 @@ def auth_md():
         "operations; protected decisions require x402 plus matching caller proof.\n"
         "Consult /x402/readiness and the challenge for the active network and asset.\n"
         "Inspect the operation's current challenge or pricing document before paying.\n\n"
+        f"{support.markdown()}"
         "## OAuth\n"
         "Agent Guild uses no delegated OAuth. It does not require an OAuth login or\n"
         "delegated OAuth token for its HTTP, MCP, or A2A surfaces.\n"
@@ -4804,7 +4809,7 @@ def for_agents():
 Inspect received artifacts in a sandbox before execution. Machine-readable policy:
 GET /coordination-policy. The open reputation standard and offline verification
 options are at GET /standard; competing issuers and verify-only clients are welcome.
-"""
+""" + "\n" + support.markdown()
 
 
 @app.get("/standard")
@@ -5474,6 +5479,7 @@ def llms_txt():
         # with a test behind it, and prepending the paid section broke it. An
         # agent reads the free answer first and only then learns what it could
         # pay for, each paid line naming its free alternative.
+        + support.markdown()
         + paidcatalog.llms_txt_section()
     )
 
@@ -6091,6 +6097,7 @@ def pricing_table():
     with, and a price nobody can argue with is one nobody has measured."""
     return {
         **pricing.table(),
+        "support_contribution": support.contribution(),
         "free_forever": {
             "GET /preflight": "live checks + verdict for one endpoint",
             "GET /index": "the public index and what we observed",
diff --git a/live/guild/app/support.py b/live/guild/app/support.py
new file mode 100644
index 0000000..e8dc0f7
--- /dev/null
+++ b/live/guild/app/support.py
@@ -0,0 +1,29 @@
+"""Optional support contribution, separate from metered service purchases."""
+from html import escape
+
+STRIPE_URL = "https://buy.stripe.com/4gM28rcidcv95mY4vu0Ny00"
+LABEL = "Support Agent Guild — contribute £1"
+DESCRIPTION = "A voluntary contribution to support Agent Guild. No service or API credits are included."
+
+
+def contribution() -> dict:
+    return {
+        "purpose": "voluntary_support",
+        "label": LABEL,
+        "checkout_url": STRIPE_URL,
+        "provider": "Stripe",
+        "checkout_type": "hosted",
+        "amount": {"currency": "GBP", "value": "1.00"},
+        "description": DESCRIPTION,
+        "service_included": False,
+        "api_credits_included": False,
+    }
+
+
+def markdown() -> str:
+    return f"## Optional support\n\n[{LABEL}]({STRIPE_URL})\n\n{DESCRIPTION}\n\n"
+
+
+def html() -> str:
+    return (f'<h2>Optional support</h2><p class=k><a href="{STRIPE_URL}">'
+            f'{escape(LABEL)}</a><br>{escape(DESCRIPTION)}</p>')