# Harmonic Searcher API (gRPC)

**Canonical:** https://apis.io/apis/harmonic-gg/harmonic-searcher-api-grpc/  
**Provider:** Harmonic GG — https://apis.io/providers/harmonic-gg/  
**Base URL:** https://fra.be.harmonic.gg  
**Documentation:** https://docs.harmonic.gg/searchers/harmonic-bundles

Harmonic Searcher API (gRPC) is one of 2 APIs that [Harmonic GG](https://apis.io/providers/harmonic-gg/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Solana, MEV, Bundles, and gRPC. The published artifact set on APIs.io includes authentication docs.

gRPC bundle-submission interface for searchers. Authenticate with a Solana keypair (challenge-response to Bearer tokens), then submit atomic transaction bundles with revert protection. Backwards-compatible with Jito's searcher protos; tips are priority fees with no protocol cut. Requires a whitelisted searcher pubkey.

## Machine-readable artifacts (6)

- **Protobuf** — https://raw.githubusercontent.com/api-evangelist/harmonic-gg/refs/heads/main/grpc/harmonic-gg-searcher-searcher.proto
- **Protobuf** — https://raw.githubusercontent.com/api-evangelist/harmonic-gg/refs/heads/main/grpc/harmonic-gg-searcher-auth.proto
- **Protobuf** — https://raw.githubusercontent.com/api-evangelist/harmonic-gg/refs/heads/main/grpc/harmonic-gg-searcher-bundle.proto
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/harmonic-gg/refs/heads/main/authentication/harmonic-gg-authentication.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/harmonic-gg/refs/heads/main/errors/harmonic-gg-error-codes.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/harmonic-gg/refs/heads/main/apis.yml

## Other Harmonic GG APIs (1)

- [Harmonic Validator API (gRPC)](https://apis.io/apis/harmonic-gg/harmonic-validator-api-grpc/)

## Tags

Solana, MEV, Bundles, gRPC

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/harmonic-gg/harmonic-searcher-api-grpc/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/harmonic-gg/.