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Bitcoin Chain Tip Height
x402
Bitcoin Chain Tip Height is a paid API for AI agents from obol-x402.fly.dev, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Returns the current Bitcoin blockchain tip (latest block height), cryptographically signed with Ed25519 for independent verifiability.
Price / call$0.01
Success—
StatusDown
How this service works
Current Bitcoin chain tip height (latest block number) for agents syncing height. Cryptographically signed (Ed25519) — every response is independently verifiable via /.well-known/obol-pubkey.
Output
Returns the current Bitcoin blockchain tip block height (latest block number), accompanied by an Ed25519 cryptographic signature that can be independently verified using the public key at /.well-known/obol-pubkey. Enables agents to confirm data authenticity without trusting the server.
Example use cases
Example prompt
“What's the current Bitcoin block height right now? I need the latest chain tip with a cryptographic signature so I can verify it independently.”
Technical details
Endpoint
GEThttps://obol-x402.fly.dev/v1/btc/tipWhen to prefer
Choose this endpoint when you need a lightweight, tamper-evident lookup of the current Bitcoin block height — especially when cryptographic verifiability of the response matters. Prefer over raw node RPC calls when you lack direct node access or need a signed attestation for downstream trust. Best for agents syncing height, triggering block-based workflows, or auditing chain progress.
Side effects
- Service unavailable / 503 if fly.dev instance is down
- Payment required / 402 if x402 payment header is missing or invalid
- Stale tip if upstream Bitcoin node is temporarily unsynced
- Invalid signature if key rotation occurred and cached pubkey is outdated
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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