# Solana secp256k1 Instruction Inspector

> Solana secp256k1 Instruction Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Structurally inspects a Solana secp256k1 instruction payload — parsing signature count, data bytes, offset table, and structural validity — without performing cryptographic verification.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/solana_secp256k1_instruction_inspect/invoke
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/solana-secp256k1-instruction-inspector-53dccd71
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YhJRdq2RJE5nml9XbsTJm

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability solana-secp256k1-instruction-inspector-53dccd71 -d '<json body>'
```

Example prompt: Can you inspect the structure of this Solana secp256k1 instruction and tell me if it's structurally valid, how many signatures it has, and how many data bytes it contains — no cryptographic verification needed, just the structural breakdown?

## When to prefer this

Choose this endpoint when you need fast, lightweight structural parsing of a Solana secp256k1 instruction — particularly for debugging, pre-submission validation, or pipeline analysis — and do not require cryptographic signer authentication. It is not a substitute for full on-chain signature verification.

## Known failure modes

- Malformed or non-JSON request_json input returns a parsing error
- Input exceeding 65536 characters is rejected
- Instruction data that cannot be parsed as a secp256k1 instruction may return structurally_valid: false with zero counts
- No cryptographic verification is ever performed — signer authenticity cannot be confirmed
- Payment failure in x402 protocol results in no execution

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a JSON analysis containing: algorithm (secp256k1), whether cryptographic verification was performed (always false), data byte count, offset table byte count, signature count, structural validity boolean, and trailing byte count. Also includes warnings noting that signer authentication is not performed, the evidence scope (caller-supplied data), and the analyzed network (solana).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "request_json": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Structural inspection does not recover or authenticate signers."
   ],
   "service_id": "solana_secp256k1_instruction_inspect",
   "analysis_json": "{\"algorithm\":\"secp256k1\",\"cryptographic_verification_performed\":false,\"data_bytes\":1,\"offset_table_bytes\":0,\"signature_count\":0,\"structurally_valid\":true,\"trailing_bytes\":0}",
   "evidence_scope": "caller_supplied_data",
   "analyzed_network": "solana"
  },
  "status": "succeeded",
  "receipt": {
   "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "usage": [],
   "status": "succeeded",
   "network": "eip155:8453",
   "artifacts": [],
   "endedAtMs": 0,
   "latencyMs": 0,
   "paymentId": "example-payment",
   "receiptId": "example-receipt",
   "requestId": "example-request",
   "serviceId": "solana_secp256k1_instruction_inspect",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "15000",
   "resultSha256": "43fe5950b29f0f22022839b180b309086faed75572e989f6eaa557dacdefa128",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/solana-secp256k1-instruction-inspector-53dccd71/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)