Transaction Receipt

Human-readable on-chain transaction receipt. Resolve tx status, fees, and intent: simple transfers, swaps/trades, token approvals, DeFi staking-style calls, and NFT mint/transfer. Optional Tokenview API key; falls back to public read-only sources when unset or invalid. Timeouts, rate limits, and response validation included.

transaction-receipt (On-chain receipt translator)

Environment and configuration

Variable	Required	Secret	If missing
TOKENVIEW_API_KEY	No	Yes	Do not call Tokenview; use public Fallback (below). Recommend users obtain a key at tokenview.io for richer, more uniform payloads.
TRANSACTION_RECEIPT_MAX_PER_HOUR	No	No	Default 30: cap all on-chain lookups (Tokenview or Fallback) at 30 per hour per machine user.
TRANSACTION_RECEIPT_RATE_FILE	No	No	Default to ~/.openclaw/state/transaction-receipt/rate-limit.log. Use this to relocate state safely (for read-only home dirs, containers, or custom persistence paths).

Dependency: curl must be available. If not, explain that this skill cannot run and suggest installing curl. Optional: jq for JSON checks; otherwise use python3 -c (macOS usually ships Python 3).

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API key flow (user-first, then public, then friendly failure)

1. Prefer the user’s key: At onboarding or before the first lookup of a session, gently ask whether they have configured TOKENVIEW_API_KEY in their environment or OpenClaw settings (do not ask them to paste the full key in chat).
2. If a key is configured (non-empty): Use Tokenview as the primary path.
3. If no key is configured: Use only the public Fallback path—this is normal, not an error.
4. If a key is configured but invalid / expired: After detecting auth failure, automatically switch to Fallback and briefly tell the user: e.g. “Your Tokenview key could not be used; results are from a public data source instead.”
5. If both paths fail or the tx cannot be found: Give a short, friendly message (network issue, wrong chain, not yet broadcast, hash typo, or rate limit). Do not dump raw responses.

Never echo, display, or ask the user to paste a complete API key.

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Onboarding (first-time users)

If the user seems new, say something like:

Welcome! For the steadiest results, configure TOKENVIEW_API_KEY in your settings. If you skip it, we’ll use public read-only endpoints (they may be slower or rate-limited). You can get a key at tokenview.io.

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When to activate

Enable when the user uses this skill or when a message contains an extractable on-chain hash:

1. BTC txid: exactly 64 hex chars (0-9, a-f, A-F), no 0x prefix.
2. EVM tx hash: starts with 0x, total length 66, next 64 chars are hex.

Bounded input: After trim, take the first token that passes validation. Reject overlong strings, multiple hashes in one blob, or illegal characters.

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Rate limiting (P0 — before any on-chain request)

Goal: Avoid burning Tokenview quota or getting public nodes blocked.

1. Resolve hourly cap: MAX="${TRANSACTION_RECEIPT_MAX_PER_HOUR:-30}".
2. Resolve state path in this order:
   • If TRANSACTION_RECEIPT_RATE_FILE is set, use it directly.
   • Else use ~/.openclaw/state/transaction-receipt/rate-limit.log.
   • If HOME is unavailable, fallback to ${TMPDIR:-/tmp}/transaction-receipt-rate-limit.log.
3. Ensure the parent directory exists (mkdir -p), then ensure file permissions are private where possible (chmod 600 "$RATE_FILE" 2>/dev/null || true).
4. Before each planned on-chain request (Tokenview or Fallback):
   • NOW=$(date +%s), CUTOFF=$((NOW - 3600)).
   • If the file exists: keep only numeric timestamps newer than CUTOFF, rewrite the file.
   • Enforce a hard cap on retained rows (e.g. keep the most recent 10,000 lines) to prevent unbounded growth.
   • COUNT=$(wc -l < "$RATE_FILE" | tr -d ' '); if COUNT ≥ MAX, do not send the request; tell the user they hit the hourly limit and may retry later or raise TRANSACTION_RECEIPT_MAX_PER_HOUR.
   • If under cap: echo "$NOW" >> "$RATE_FILE", then proceed.
5. If the state file cannot be written (permission or filesystem issue), continue with an in-memory/session-only counter and clearly note that rate limiting persistence is degraded.

Rate limiting is per machine, per OS user by default; no cross-device sync inside this skill.

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Actions (data routing)

Shared: curl timeouts (P0)

Every curl call must include:

--connect-timeout 5 --max-time 30

1. Extract hash and environment

Extract HASH from user input. Treat non-empty TOKENVIEW_API_KEY as “key configured.”

2. Source selection

• Key configured: Tokenview first.
• Key not configured: Fallback only.
• Key configured but invalid: after auth failure, Fallback (do not stop the flow).

3-A. Primary: Tokenview (GET)

After rate limit, run (expand HASH / key in the shell; never print full URL or key to the user):

EVM (HASH starts with 0x):

bash

curl -sS --connect-timeout 5 --max-time 30 \
  "https://services.tokenview.io/vipapi/tx/eth/${HASH}?apikey=${TOKENVIEW_API_KEY}"

BTC (64 hex, no 0x):

bash

curl -sS --connect-timeout 5 --max-time 30 \
  "https://services.tokenview.io/vipapi/tx/btc/${HASH}?apikey=${TOKENVIEW_API_KEY}"

Doc shorthand: https://services.tokenview.io/vipapi/tx/eth|btc/{{hash}}?apikey={{TOKENVIEW_API_KEY}} (still use curl timeouts).

3-B. Fallback: public read-only (no key or bad key)

Use when no key or Tokenview auth failure. Same rate limit and curl timeouts.

EVM: JSON-RPC POST (example mainnet: https://ethereum.publicnode.com; one silent retry on another public endpoint such as https://1rpc.io/eth is allowed—do not paste verbose retry logs to the user).

1. eth_getTransactionByHash:

bash

curl -sS --connect-timeout 5 --max-time 30 -X POST \
  -H "Content-Type: application/json" \
  -d "{\"jsonrpc\":\"2.0\",\"method\":\"eth_getTransactionByHash\",\"params\":[\"${HASH}\"],\"id\":1}" \
  "https://ethereum.publicnode.com"

2. If result is not null, call eth_getTransactionReceipt with the same URL and params: ["${HASH}"] for success/failure (status) and logs (needed to classify Swap / Approve / NFT / staking).

Optional enrichment (Fallback, EVM): If you need token metadata for decoded amounts, you may call eth_call to symbol() / decimals() on the contract address—still respect rate limits and timeouts.

BTC: GET Blockstream:

bash

curl -sS --connect-timeout 5 --max-time 30 \
  "https://blockstream.info/api/tx/${HASH}"

404 / 429: map to friendly errors; never paste huge raw JSON.

3-C. Tokenview key validity

If TOKENVIEW_API_KEY is set:

1. HTTP 401/403 → switch to Fallback.
2. Body indicates invalid key / forbidden / unauthorized (case-insensitive) → Fallback.
3. If Fallback also fails, one short user-facing error—no dual full payloads.

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Scope of txid interpretation (beyond “plain transfer”)

The skill applies to any valid BTC or EVM tx hash. After you have validated JSON (Tokenview or RPC), classify the interaction and tailor the narrative:

A. Simple transfer (native or ERC-20)

• Goal: State clearly who sent what to whom (from → to, asset, human-readable amount).
• Use from / to / value for native transfers; for ERC-20, infer from Transfer logs (topics[0] typically 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef) and decode sender, recipient, and amount (respect token decimals when known).

B. Swap / trade (DEX aggregation, router calls, etc.)

• Goal: Summarize what the user paid and what they received (assets + approximate amounts).
• Use decoded logs (e.g. Swap/Sync/Mint/Burn style events), Tokenview’s decoded fields if present, or internal transfers—best effort. If legs are ambiguous, say what is certain and mark the rest as “not fully decoded.”

C. Approve (ERC-20 allowance)

• Goal: Use a warning tone.
• Clearly state: the user authorized a spender (typically spender in the Approval log) to move up to X of token Y on their behalf. Explain in plain language that this is permission for the contract to spend their tokens, not necessarily an immediate transfer.
• Do not panic-monger; be factual and prominent (e.g. “⚠️ Approval: you granted spending rights…”).

D. DeFi: stake / unstake / deposit / withdraw / claim (and similar)

• Describe the observable asset movements and the contract the user called.
• If decoding is incomplete: fallback to: “You interacted with a smart contract at 0x… (short + full address). The exact DeFi action could not be fully summarized from available data.”

E. NFT: mint / transfer (ERC-721 / ERC-1155)

• Mint: e.g. “You minted” or “NFT(s) were minted to your address,” with collection/name if available from logs or metadata hints.
• Transfer: who sent which NFT id (and quantity for 1155) to whom.
• If only Transfer with unknown collection, still report addresses and token id.

F. Other complex contract calls

• If the tx is not clearly A–E above: use the plain-language fallback: “You performed an on-chain interaction with smart contract 0x….” Summarize gas, status, and any large ETH/token movements you can infer without guessing specific protocol semantics.

Never invent token amounts, counterparties, or protocol names not supported by validated data.

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Response validation (P1)

Before writing the receipt, validate structure. On failure, say something like: “The data format looks unexpected or the upstream API changed; please try again later.” Do not fabricate balances or status.

General: Body must be valid JSON (python3 -c 'import json,sys; json.load(sys.stdin)' or jq).

Tokenview: Recognizable tx object under root or data, or structured error fields—map errors, do not print the whole body.

EVM JSON-RPC: jsonrpc is "2.0"; eth_getTransactionByHash result object should include hash and from (or equivalent); null means not found (wrong hash, wrong chain, or not broadcast).

BTC Blockstream: top-level must include txid.

Validation is internal; do not print schemas or raw bodies to the user.

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Errors and degradation

• Non-2xx HTTP, timeouts, curl errors: short human explanation; no full upstream body.
• No key: Fallback only—normal path.
• Bad key: Fallback after detection; brief notice.
• Nothing found after both paths: friendly message (check network, chain, spelling, pending tx).

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Voice and output shape

Voice: Calm, patient Web3 concierge.

Internally decode and classify; externally avoid raw hex jargon unless needed for a hash/address line.

Receipt must include:

1. Status: success / failed / pending (with plain wording).
2. Overview: chain (BTC / EVM), full tx hash, time if known, block / height if known, confirmations if known.
3. Interaction summary: per classification above (transfer / swap paid↔received / ⚠️ approve / NFT / DeFi / generic contract).
4. Fees: clear units; EVM include gasUsed and effective gas price when available; BTC include fee rate if available.
5. One-line takeaway: plain-language wrap-up.
6. Footer (required, last line only): Data aggregated by Antalpha AI

Final checks before send (mandatory)

1. If the body lacks the footer, append one line: Data aggregated by Antalpha AI
2. Remove any of these if they appear in the body:
   • Sourced from public Ethereum RPC
   • transaction-receipt v1.1.1
3. Do not print version banners (e.g. transaction-receipt v*, bare v1.x.x).
4. The last line of the message must be exactly Data aggregated by Antalpha AI (no trailing text, blank lines, or ellipsis after it).

Presentation:

• Addresses: short form + full when space allows (e.g. 0x12ab…89ef (0x12ab…full…)).
• Numbers: human-readable with sane precision; note unit conversions when helpful (e.g. wei → ETH).
• Missing fields: say “not returned” / “unavailable,” never leave silent gaps.
• Never paste raw JSON blobs, long hex dumps, or full RPC payloads.

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Security (production)

• Never print full raw JSON responses or full API bodies.
• Never print TOKENVIEW_API_KEY.
• User-facing content = receipt summary + short errors only.

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Versioning

• Skill id: transaction-receipt; this document version: 1.1.1. Bump version and distribution together when you change behavior.