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api.nativebtc.org template optimized-txids
https://api.nativebtc.org/v1/template/optimized-txids
payable
Full optimized block template txid list from the live Core v31 optimizer cache. Requests up to 4,000 txids, constrained by Bitcoin block weight. Returns ordered txids, template metadata, baseline-vs-optimized fee totals, mempool size, fee uplift, baseline comparison, coinbase value, and Ed25519 receipt metadata for Stratum V2 Job Declaration workflows.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.05
- Network
- base
- Pay to
- 0x0300E73759B357ceeE5A248d1801eCb8abf7A1d4
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 188 ms
- Payment options
- 4 usable of 4
- Last checked
- 2026-08-10T09:11:23.552Z (1d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.nativebtc.org%2Fv1%2Ftemplate%2Foptimized-txids"