Predge · Signed Attestations

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x9084f5000e07c7133d6da5ee4f271ab6d1821144",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://x402-api-production-266e.up.railway.app/v1/sports/attest/:league/:eventId",
    "description": "Cryptographically SIGNED settled-SPORTS-outcome ATTESTATION for one game (path params: league — one of nba|wnba|nfl|college-football|mlb|nhl|mls|epl|champions-league|laliga — and eventId, an ESPN event id). Returns the SETTLED result (winner, final score, completed) as an ed25519-signed envelope verifiable OFFLINE against the SAME published key as /v1/attest. Optional query param: winner (team abbreviation) — adds correct (true iff it matches the settled winner, null while unsettled). Data source: ESPN's public scoreboard (no key, no account). Outcome-verified truth, not a prediction — the tamper-evident settled outcome a betting/trading agent needs for settlement, dispute, or a verifiable track record. 404 (not charged) for an unknown league or event id.",
    "maxAmountRequired": "20000",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {},
    "payTo": "9dxMRRtC7RKZH5rFZpUywjmnQ87H9qHhtW43u5LYmpV",
    "amount": "20000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://x402-api-production-266e.up.railway.app/v1/sports/attest/:league/:eventId",
    "description": "Cryptographically SIGNED settled-SPORTS-outcome ATTESTATION for one game (path params: league — one of nba|wnba|nfl|college-football|mlb|nhl|mls|epl|champions-league|laliga — and eventId, an ESPN event id). Returns the SETTLED result (winner, final score, completed) as an ed25519-signed envelope verifiable OFFLINE against the SAME published key as /v1/attest. Optional query param: winner (team abbreviation) — adds correct (true iff it matches the settled winner, null while unsettled). Data source: ESPN's public scoreboard (no key, no account). Outcome-verified truth, not a prediction — the tamper-evident settled outcome a betting/trading agent needs for settlement, dispute, or a verifiable track record. 404 (not charged) for an unknown league or event id.",
    "maxAmountRequired": "20000",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "queryParams": {
          "winner": "COL"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "kind": "sports-outcome",
          "issuer": "predge.io",
          "verify": "ed25519: verify `signature` (hex) over the UTF-8 bytes of `canonical` using `public_key` (hex, raw 32-byte ed25519). `canonical` is JSON with keys sorted lexicographically and no whitespace.",
          "correct": true,
          "payload": {
            "away": "COL",
            "home": "MIL",
            "kind": "sports-outcome",
            "event": "COL at MIL",
            "issuer": "predge.io",
            "league": "mlb",
            "source": "espn",
            "winner": "COL",
            "correct": true,
            "version": "predge-attest-v1",
            "event_id": "401816246",
            "completed": true,
            "issued_at": "2026-07-25T10:00:00.000Z",
            "away_score": 5,
            "home_score": 2,
            "scheduled_at": "2026-07-24T20:10Z",
            "queried_winner": "COL"
          },
          "version": "predge-attest-v1",
          "algorithm": "ed25519",
          "canonical": "{\"away\":\"COL\",\"away_score\":5,\"completed\":true,\"correct\":true,\"event\":\"COL at MIL\",\"event_id\":\"401816246\",\"home\":\"MIL\",\"home_score\":2,\"issued_at\":\"2026-07-25T10:00:00.000Z\",\"issuer\":\"predge.io\",\"kind\":\"sports-outcome\",\"league\":\"mlb\",\"queried_winner\":\"COL\",\"scheduled_at\":\"2026-07-24T20:10Z\",\"source\":\"espn\",\"version\":\"predge-attest-v1\",\"winner\":\"COL\"}",
          "signature": "3a1f…64-byte-hex…9c",
          "data_basis": "Settled game result from ESPN's public scoreboard (final score + winner). Outcome-verified truth, not a prediction — signed so a consumer can verify it offline.",
          "public_key": "d75a9807...c7e2a1",
          "queried_winner": "COL",
          "outcome_verified": true
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "winner": {
                  "type": "string",
                  "description": "Optional team abbreviation to check correctness for (e.g. COL)"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog

—

Last indexed by Roundhouse

2026-09-21 22:15Z

Last enriched (probe, favicon, geo)

2026-09-21 22:45Z

x402 version

2

Max timeout

60s

Liveness probe

HTTP 404