Add SQD to Data Indexers

[karelxfi]

Proposal of adding https://www.sqd.dev/ to Data Indexers as we discussed.

[douglasborthwick-crypto]

Along the lines of adding data tooling to the docs — worth considering InsumerAPI as a verification/attestation layer.

It provides privacy-preserving on-chain verification across 31 chains (including Mode's parent chain ecosystem on OP Superchain). The core endpoint (POST /v1/attest) checks token balances and NFT ownership and returns ECDSA-signed booleans — no raw balances exposed.

Relevant for Mode's agentic DeFi positioning:

• Agents can verify wallet holdings before executing strategies
• ECDSA signatures enable agent-to-agent trust (one agent verifies, another checks the signature offline)
• Ships as an MCP server (npx -y mcp-server-insumer) which fits Mode's synth-mcp infrastructure

Resources:

• OpenAPI spec
• MCP Server (npm)
• LangChain toolkit (PyPI)
• Developer docs