Spend controls for Voice AI. Your agent's whole bill — telephony, STT, LLM, TTS, search — on one ledger, enforced before money moves. Inside Vapi, Retell & Bland, or fully BYOK.

Website · Docs · Dashboard · 𝕏 @FloeLabs

Start free. $3 Welcome Credit — 300 API credits on signup, no card required. Your agent makes its first paid call in minutes. Get started →

A voice call touches 7–20 vendors, each billing separately. Token and TTS usage varies every conversation, so true per-call cost only exists by joining usage data across providers after the call. A token router meters ~40% of the bill — the LLM slice — and is blind to the other 60%. On BYOK, platform dashboards report provider costs as $0.

Floe is that join, plus enforcement: per-call cost across every vendor, and caps applied before money moves where Floe is in the path — with a between-call circuit breaker everywhere else. Gateway overhead: 38ms p50 / ~180ms p99 on live keyless production traffic.

A single spoken turn spends across speech-to-text, an LLM, and text-to-speech. Same key, same task budget for all three — a token router only ever sees the middle step.

# 1 · Transcribe (Deepgram) — through the Floe proxy
curl -X POST https://credit-api.floelabs.xyz/v1/proxy/fetch \
  -H "Authorization: Bearer $FLOE_API_KEY" \
  -H "Content-Type: application/json" \
  -H "X-Floe-Task-Id: call-8842" \
  -d '{"url":"<DEEPGRAM_STT_ENDPOINT>","method":"POST","body":"{...audio...}"}'

# 2 · Reason (any LLM) — keyless: only your Floe key, same ledger
curl -X POST https://credit-api.floelabs.xyz/v1/chat/completions \
  -H "Authorization: Bearer $FLOE_API_KEY" \
  -H "Content-Type: application/json" \
  -H "X-Floe-Task-Id: call-8842" \
  -d '{"model":"openai/gpt-4o","messages":[{"role":"user","content":"Book Friday at 2pm."}]}'

# 3 · Speak (ElevenLabs) — through the Floe proxy
curl -X POST https://credit-api.floelabs.xyz/v1/proxy/fetch \
  -H "Authorization: Bearer $FLOE_API_KEY" \
  -H "Content-Type: application/json" \
  -H "X-Floe-Task-Id: call-8842" \
  -d '{"url":"<ELEVENLABS_TTS_ENDPOINT>","method":"POST","body":"{...text...}"}'

All three legs share X-Floe-Task-Id, so one budget caps the whole conversation — STT, LLM, and TTS together, on one ledger. Each response returns its cost in X-Floe-Payment-Amount (e.g. 0.0125).

MCP (zero install) — add to Claude Code / Cursor / Claude Desktop:

claude mcp add --transport http floe https://mcp.floelabs.xyz/mcp \
  --header "Authorization: Bearer YOUR_FLOE_KEY"

Prefer an SDK? npm install floe-agent or pip install floe-agentkit-actions — see Repos.

1 · Inside your platform (Vapi / Retell / Bland). Documented hooks, zero platform cooperation:

• Custom-LLM slot → Floe — pre-call enforcement on ~60% of call cost. Recipes: vapi-custom-llm, retell-custom-llm. (Bland has no self-serve custom LLM — govern it with Reconcile Mode below.)
• Custom voice & transcriber → Floe (early access) — metered STT/TTS in your provider dropdown. Behind a flag until we publish a media-path latency benchmark — we don't promote a leg in your audio path ahead of its numbers. Recipe: vapi-voice-metered.
• End-of-call webhooks → Reconcile Mode — every call reconciled onto one ledger at call-end; cross your cap and the next call is denied. A runaway campaign dies at call N, not call 10,000.
• Coverage Score, per agent, in the dashboard — % of spend enforceable pre-call vs reconciled vs dark, and which leg to move to raise it.

Pre-call where we're in the path. Circuit breaker everywhere else. Setup → · Graduate to 100% coverage →

2 · BYOK. Keep your vendor accounts and keys — Floe meters, joins, and caps on top. Route just the LLM leg by changing the base URL and key:

from openai import OpenAI

client = OpenAI(
    base_url="https://credit-api.floelabs.xyz/v1",  # was https://api.openai.com/v1
    api_key=os.environ["FLOE_API_KEY"],             # your Floe key — not an OpenAI key
)
# every call now bills to your Floe balance, under your spend caps

OpenAI-compatible, so it works from any SDK. → Add Floe to your existing pipeline

3 · Keyless. One Floe key, no per-vendor accounts, welcome credits. Fund by card; settlement is automatic. Best for prototypes and net-new agents.

Browse the full directory →

Voice recipes (in floe-cookbook): vapi-custom-llm · retell-custom-llm · vapi-voice-metered

Built by operators from Airwallex, Western Union, eBay, Kado, Transak. hello@floelabs.xyz