feat: add mppgas — multi-chain gas price tracker

[Vanya13917]

Summary

Adds mppgas to the mpp.dev service catalog — a multi-chain gas price tracker deployed at https://mppgas.vercel.app.

• Returns slow / standard / fast gas prices in gwei, native token USD price, and estimated 21,000-gas transfer cost in USD for 7 chains: Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, and Tempo
• $0.01 USDC.e per request via Tempo MPP
• Gas-abstracted (feePayer sponsored) — agents only need USDC.e, no native Tempo gas required
• Results cached 10s per chain
• OpenAPI spec: https://mppgas.vercel.app/openapi.json

Changes

• schemas/services.ts — adds mppgas entry with TEMPO_PAYMENT, two endpoints (GET /api/gas and GET /api/info), categories ["blockchain", "data"]

Test

curl https://mppgas.vercel.app/api/info

A live agent payment test was completed successfully (all 7 chains returned gas data).

[vercel]

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[github-actions]

Thanks for submitting a service to the MPP directory!

If you want your service included in the curated mpp.dev/services list, complete this checklist before review:

Required

• Your service is live and accepting payments via MPP (not a placeholder or coming-soon)
• You've added your entry to schemas/services.ts following the contributing guide
• Types pass: pnpm check:types
• Build succeeds: pnpm build

Recommended

• Register your service on MPPScan (by Merit Systems) — it follows the standard MPP discovery format and makes your service discoverable by agents immediately, no PR required

Review criteria

We prioritize services that are high quality and novel. We may not approve services that duplicate existing functionality or aren't yet production-ready.

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Contributing guide · MPPScan · Protocol docs

[github-actions]

🔀 Changed Services

✅ Added

• mppgas