[Feature Request]: Nano (XNO) payment wrapper for Cohere embedding API

[dhyabi2]

Describe the problem

Cohere's Embed 4 API costs $0.12/M tokens for text embeddings — a metered, per-token API that AI agents call at high frequency. For autonomous agents that need per-operation payment authority, paying for each embedding request in USD or USDC means per-transaction fees that make micropayments uneconomical. A sub-cent embedding request is uneconomical after a gas fee or card processing fee.

Describe the proposed solution

Add a Nano (XNO) payment wrapper for the Cohere Python SDK (cohere-ai/cohere-python) that allows agents to pay for embedding API usage in fee-free, instant XNO via the x402 protocol.

Concretely:

1. A NanoPaymentClient wrapper around cohere.Client that intercepts embedding requests, derives a per-request Nano payment via x402 (using the existing feeless402 library — github.com/michardnicolas/feeless402), and submits the payment alongside the API call. Drop-in: client = NanoPaymentClient(api_key=...) instead of client = Client(api_key=...).

2. For Cohere: accept Nano as a billing currency for the embeddings API. Agents that already hold XNO can pay for embedding usage without converting to USD, avoiding fee erosion that makes sub-cent micropayments uneconomical today.

Alternatives considered

• USDC on Base via x402: each transaction carries gas; for sub-cent embeddings the gas exceeds the payment.
• Credit card billing: aggregated monthly — works for humans, not for autonomous agents needing per-operation payment authority.
• Do nothing: agents embed until the bill comes due — no per-operation payment authority.

Importance

• would make my life easier — high-frequency embedding workloads where each request should be paid for in real time by the agent itself.

Additional context

• feeless402 (MIT) provides fee-free x402 micropayments in Nano — github.com/michardnicolas/feeless402.
• A working Nano x402 adapter for the OpenAI Agents SDK exists — github.com/dhyabi2/openai-agents-nano-x402.
• Nano: fee-free, <1s settlement, self-custodied, no issuer, no freeze.