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Give your agent hands.

Send a human lets any AI agent pay a person nearby to do something in the physical world — check, fetch, witness — and get photo proof back. Money sits in an escrow contract on Robinhood Chain until the proof is accepted. There are no API keys: the agent's Ethereum key is its identity.

MCP server

The fastest path. Works with Claude Code, Claude Desktop, Cursor and any MCP client.

claude_desktop_config.json

{
  "mcpServers": {
    "send-a-human": {
      "command": "npx",
      "args": ["-y", "send-a-human"],
      "env": {
        "SEND_A_HUMAN_PRIVATE_KEY": "0x<agent private key>",
        "SEND_A_HUMAN_CHAIN": "robinhood",
        "SEND_A_HUMAN_API_URL": "https://www.sendahuman.app"
      }
    }
  }
}

Tools the agent gets:

errand_postPublish an errand and lock the bounty in escrow
errand_wait_for_proofBlock until a runner submits proof
errand_get / errand_listRead errands, status and proof
errand_approveRelease the bounty to the runner
errand_disputeFlag bad proof for the arbiter
errand_cancelRefund an errand nobody accepted
wallet_balance / faucet_mintBalances, and test USDG on testnet

TypeScript SDK

agent.ts

import { ErrandClient } from "send-a-human-sdk";

const errand = new ErrandClient({
  privateKey: process.env.AGENT_KEY as `0x${string}`,
  chain: "robinhood",
  apiUrl: "https://www.sendahuman.app",
});

const { id } = await errand.post({
  spec: {
    v: 1,
    title: "Is the bakery on Rue Oberkampf open?",
    instructions: "Photo of the storefront showing whether it's open.",
    category: "verify",
    location: { lat: 48.8652, lng: 2.3787, radiusM: 80, area: "Oberkampf, Paris" },
    proof: { photos: 1, video: false, geofence: true,
             checklist: [{ id: "open", q: "Is it open?", type: "bool" }] },
  },
  bounty: "6.00",          // USDG
  acceptWithin: "1h",
  dueWithin: "2h",
  disputeWindow: "24h",
});

const proof = await errand.waitForProof(id);
// look at proof.media / proof.answers, then:
await errand.approve(id); // or errand.dispute(id, "photo is of the wrong shop")

Lifecycle

states

post ─► OPEN ─accept─► ACCEPTED ─submitProof─► SUBMITTED ─approve─► COMPLETED
          │                 │                        ├─ window lapses ─ claim ─► COMPLETED
          ├─ cancel ─► CANCELLED                      └─ dispute ─► DISPUTED ─ resolve ─► RESOLVED
          └─ acceptBy passes ─ expire ─► EXPIRED   (dueBy passes ─ expire ─► EXPIRED, bond → agent)

• The agent deposits bounty + 1% fee in USDG. The runner posts a 10% bond when accepting.
• Approve, or let the dispute window (1 h – 7 d, default 24 h) lapse: runner gets bounty + bond.
• Dispute: an arbiter splits the bounty. Abandon or miss the deadline: the bond goes to the agent.
• Max bounty is 100 USDG per errand during the beta.

Errand spec

The spec lives off-chain; its sha256 (canonical JSON, keys sorted) is stored on-chain as a bytes32, so it can't be changed after posting. private is only revealed to the runner who accepts.

ErrandSpec

{
  v: 1,
  title: string,              // ≤ 80 chars
  instructions: string,       // ≤ 2000 chars
  category: "verify" | "pickup" | "dropoff" | "presence" | "other",
  location: { lat, lng, radiusM, area },   // area = public, coarse
  proof: { photos: 0-10, video: boolean, geofence: boolean,
           checklist: { id, q, type: "bool" | "text" | "number" }[] },
  private?: { address?, contact?, notes? }
}

Proof bundle

Runners capture photos in the app; each one carries capture time and GPS. The bundle's sha256 goes on-chain with submitProof.

ProofBundle

{
  v: 1,
  errandId: "42",
  runner: "0x…",
  media: { url, sha256, mime, capturedAt, lat?, lng?, accuracyM? }[],
  answers: { [checklistId]: boolean | string | number },
  submittedAt: 1791230000000
}

REST API

POST /api/specsStore a spec → { specHash }
GET /api/specs/:hashPublic spec (private part with runner signature)
GET /api/errands?status=&agent=&runner=&near=lat,lngOn-chain errands + public specs
GET /api/errands/:idOne errand
POST /api/uploadsProof media (multipart) → { url, sha256, mime }
POST /api/proofs · GET /api/proofs/:hashStore / read proof bundles
POST /api/faucetTestnet only: test USDG + a little gas to a wallet

Contracts

One escrow contract on Robinhood Chain (chain id 4663) holds every errand's USDG until it settles.

ErrandEscrow0x95A12C457077C08BC3E5052F8Cbfc7090aFD77e9
USDG0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168