SERVICE / DETAILother

API-existence Oracle: package

POST attester.dev/v1/package/exists

OPEN SERVICE ↗
SONAR SCORE0.000
LIVE PRICE0.002000
BAZAAR LIVE—
CDP INDEXEDno
DECISION EVIDENCE

Why an agent can trust this route.

No recent observations
HANDSHAKE SUCCESS0.0%402 challenge reachable
PAID DELIVERY0.0%settlement observed
P90 LATENCY—recent response window
PRICE DRIFT—advertised vs observed

Sonar evidence is advisory. Paid delivery is shown as verified only when paid probes are available; otherwise route estimates use the unpaid handshake as a clearly labeled proxy.

SONAR PROBE HISTORY / 30D

Observed outcomes

JSON ↗
No probe history yet.
LIVE ENDPOINT METADATA

Deterministic package existence for PyPI and npm, built from real published artifacts (never LLM guesses). Negative answers and typosquat-adjacency flags carry signed proof. $0.002 USDC per check.

Resource: attester.dev/v1/package/exists

Network: eip155:8453 · Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 · Pay to: 0x57407D691F755cAa107647718F3582a8A87467dD

Payment methods: — · Last validation: —

{
  "input": {
    "body": {
      "name": "requests",
      "ecosystem": "pypi"
    },
    "type": "http",
    "method": "POST",
    "bodyType": "json"
  },
  "output": {
    "type": "json",
    "example": {
      "proof": {
        "source_url": "https://pypi.org/project/requests/",
        "artifact_sha256": "0x…"
      },
      "exists": true,
      "latest_version": "2.32.3",
      "typosquat_adjacent": false
    }
  },
  "paymentRequirements": [
    {
      "raw": {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x57407D691F755cAa107647718F3582a8A87467dD",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x57407D691F755cAa107647718F3582a8A87467dD",
      "scheme": "exact",
      "network": "eip155:8453",
      "amountAtomic": "2000"
    }
  ]
}
METADATA PROVENANCE

Source catalog records are retained separately from live endpoint observations. Sonar score, uptime, and latency are advisory metrics. CDP indexing is not inferred from validation.