Pay-per-token AI · settled on Arc

One key. Every model.
Paid per token, onchain.

Route Claude, GPT, Llama and more through a single OpenAI-compatible endpoint. No subscriptions — you pay exactly what you spend, down to the µUSDC, settled on Arc. Or run a node and earn on the other side.

Run a node

Wallet · Email · Google — a wallet is created for you.

POST /v1/chat/completions

{ "model": "auto",
  "messages": [{ "role": "user",
    "content": "Summarize this PR" }] }

node · qwen2.5-7b50% cheaper

node · llama-3.1-8brep 0.82

first-party · fallbackalways on

billed$0.000002

Settled on

Arc testnet

Granularity

1 µUSDC

API

OpenAI-compatible

Payments

x402 · USDC

How it works

From zero to a metered call in minutes

Connect & fund

Point your tools

Use the OpenAI-compatible endpoint with your key. Cursor, Aider, the SDK — no code changes.

Pay per token

Each call is metered to the µUSDC and gated against your budget. Settle the balance on Arc, anytime.

For builders

Buy inference, pay per token

One key, every model — swap without changing code
Balance-aware auto-routing to the cheapest capable model
Budget + context guardrails enforced before each call
Set a minimum-discount floor and never overpay

For providers

Run a node, earn per token

Point a node at any OpenAI-compatible backend (HF, Ollama, vLLM)
Prove wallet ownership + pass a capability canary to join
Earn USDC per token; paid out on Arc
Reputation, bonding & slashing keep the market honest

Provider guide

Why Obol

Built like infrastructure, priced like a meter

One API, many models

OpenAI-compatible. Anthropic, OpenAI, and open models behind a single endpoint.

Metered to the token

Worst-case cost is gated up front; you're billed on actual usage, to the µUSDC.

Marketplace routing

Requests route to the cheapest healthy node, with a first-party fallback.

Verified supply

Nodes prove identity, pass a canary, post a bond — and get slashed for cheating.

Drop-in for your tools

Point Cursor, Aider, or the OpenAI SDK at Obol with your key. No rewrites.

Keys are identity

Each key carries balance and permissions. Mint, rotate, and revoke at will.

Integration

If it speaks OpenAI, it speaks Obol

Change one base URL and one key. Auto-routing picks the model; metering and settlement happen underneath. Streaming, tools, and the Anthropic Messages shape are all supported.

terminal

curl https://obolservice.onrender.com/v1/chat/completions \
  -H "Authorization: Bearer $OBOL_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "auto",
    "messages": [{ "role": "user", "content": "Hello from Obol" }]
  }'

Start spending — or start earning.

Fund a few cents of USDC and make your first metered call, or run a node and get paid per token.

Read the docs

One key. Every model.Paid per token, onchain.