Connect your prepaid budget to your AI.

Choose €10–€10,000 including applicable taxes and confirm payment yourself.
Save the private budget code. Keep it in your client’s secret configuration, never in prompts, tool arguments or URLs.
Choose a compatible remote MCP client or the local Node.js kit below. Read your budget first, then explicitly authorise paid checks.

Choose an API budget · Review the prepaid API controls

Remote prepaid MCP — six tools, five paid operations

https://pfxxzsnboehxsefyajml.supabase.co/functions/v1/xynthera-ai-payg-mcp/mcp

Stateless Streamable HTTP. Configure Authorization: Bearer YOUR_PRIVATE_BUDGET_CODE, Content-Type: application/json and Accept: application/json, text/event-stream as protected HTTP headers. This server does not provide OAuth login. An OAuth-only client, including a client that requires native OAuth onboarding, may be incompatible. No universal ChatGPT or other client compatibility is claimed.

Tool	Cost HT	Input
get_budget_status	Free; code required	Empty arguments: current paid balance and state
reconcile_invoice	€0.005	Complete supplied structured invoice/order/receipt/payment JSON with request_id
check_contract	€0.010	Supplied OpenAPI API-contract JSON document, optional paired supplied offers and request_id; not a legal contract review
check_events	€0.002 per batch	1–200 supplied JSON events and request_id
effect_guard	€0.00039 per new logical decision	Prepare and recover one replay-sensitive logical action; performs no provider action
spend_truth	€0.00029 per new logical reservation	Reserve a maximum before delegated work; performs no provider action

Remote tool arguments are the complete API input object directly, not an input wrapper. Five paid operations are defined. EffectGuard and SpendTruth are callable only while the live machine status reports them available. Registration, RP Guard, Watch and Agent Action are not granted by this connection.

After a buyer prepays, an AI client may consume the paid operations currently marked available within the server-enforced remaining net balance. This is bounded API consumption, not autonomous payment: the AI cannot create a purchase, increase or recharge the budget, or pay another supplier. The remote bridge adds no per-session ceiling, so authorise calls in the client before enabling paid tools. Save every returned report and signature. An identical request_id with unchanged input avoids a second debit; limited reconstruction metadata lasts 30 days. Do not retry automatically or replace the ID after an uncertain transport outcome.

Protocol versions: 2025-11-25, 2025-06-18 and 2025-03-26. Initialize, send notifications/initialized, then include the negotiated MCP-Protocol-Version header. No SSE session, prompts, callbacks or arbitrary URL execution.

Remote setup and free first request

Historique de publication du registre MCP

Local PAYG kit — Bearer budget code and separate session ceiling

The Node.js 20+ local stdio bridge in the downloadable kit covers the three historical structured-data checks. Use the remote MCP or the dedicated Guard quickstarts for EffectGuard and SpendTruth. Its suggested configuration starts with a 0 € session ceiling, blocking paid calls until you explicitly configure a positive HT ceiling. The ceiling counts one process only: restarting resets its local counter, while your paid server balance remains authoritative.

Download PAYG Bearer kit — Python, JavaScript and local MCP Local configuration without secrets Local onboarding guide

This PAYG kit authenticates with Authorization: Bearer. It is separate from historical EUDI/Workbench SDKs and CLI, which use x-api-key under previously accepted subscriptions. The local tools use their documented {input: ...} wrapper; do not copy that wrapper into remote calls. Local setup and real client compatibility need acceptance testing in your selected client.

Legacy x-api-key / EUDI access — existing customers only

The former remote endpoint uses x-api-key and Workbench subscription access. It does not accept a prepaid budget code. Existing users retain their accepted terms; no new subscription offer is promoted here.

Recover an existing subscription · Existing protocol reference

Current API catalogue · Payment and connection modes · Free browser invoice example

Agent incident tools

Try duplicate-effect and budget-race simulations.

EffectGuard demonstrates why an ambiguous provider response must not grant a second execution authority. SpendTruth demonstrates atomic reservation before parallel agent work. Both browser simulations are free, local and unsigned. Hosted purchase is separate and remains disabled until live qualification passes.

Review counted units, configured prices and production limits.